Cable

LMR-400 Original vs Generic: A Technical Comparison

Posted on July 26, 2026July 26, 2026 by

Walk through any wholesale electronics market — or spend five minutes on Alibaba — and you’ll find dozens of cables advertised as “LMR-400 compatible”, “LMR-400 equivalent”, or simply “50Ω coaxial cable, same as LMR-400”. The price is typically 30–60% lower than genuine Times Microwave cable. That gap is real, and it comes from somewhere.

This article looks at what separates a genuine Times Microwave LMR-400 from an unbranded OEM alternative at a technical level: conductor material, dielectric, shielding, attenuation, mechanical tolerances, and environmental ratings. The differences aren’t always dramatic on a datasheet — they tend to show up in the field, at high frequencies, and over time.

What Is LMR-400?

LMR-400 is a trademarked cable design by Times Microwave Systems (USA). It was developed as a low-loss, flexible alternative to rigid coaxial cables for RF installations. “LMR” stands for Land Mobile Radio, though the cable has long since found use in VSAT, broadcast, and general RF applications.

The “400” refers to the cable’s nominal outer diameter of approximately 10.3mm (0.405 inches). Times Microwave publishes a detailed specification sheet for LMR-400, manufactured to tight tolerances at their US facility.

Because “LMR-400” has become a shorthand in the industry for “good quality 50Ω coaxial cable in the 10mm diameter class”, many manufacturers produce cables to a similar physical form factor and market them using the LMR-400 name — even though they are not manufactured by Times Microwave and are not covered by its specifications.

Construction: What’s Inside Each Cable

Both genuine LMR-400 and OEM alternatives share a broadly similar physical construction: centre conductor, foam dielectric, outer conductor (shield), and outer jacket. The meaningful differences are in the materials used at each layer.

LMR-400 internal construction comparison: original vs generic OEM — layer by layer — Layer-by-layer construction comparison: Times Microwave LMR-400 vs typical generic OEM. Key differences are in the braid material (tinned copper vs aluminium) and conductor (solid copper vs potential CCA).

Centre Conductor

Genuine LMR-400: Solid bare copper, 0.108″ (2.74mm) diameter. Copper has a resistivity of 1.72 × 10⁻⁸ Ω·m — one of the lowest of any practical conductor material.

Generic OEM: Many unbranded cables use copper-clad aluminium (CCA) rather than solid copper. CCA has a thin layer of copper bonded around an aluminium core. At RF frequencies, the skin effect concentrates current in the outer surface of the conductor — and because that surface is copper, CCA approaches copper performance at high frequencies where the cladding is thick enough relative to skin depth. The practical issues with CCA are primarily mechanical: it is harder to solder, more prone to work-hardening when bent repeatedly, and aluminium oxidises if the copper cladding is breached at a connector crimp, leading to higher contact resistance over time. Some OEM cables do use solid copper conductors — worth verifying with any supplier before purchase.

Dielectric

Genuine LMR-400: Physically foamed polyethylene (FPE), bonded to the outer conductor, with a velocity of propagation of 85%. The bonded construction keeps the dielectric fixed relative to the conductors, which helps maintain impedance consistency along the cable’s length.

Generic OEM: Usually also foam polyethylene. The foam density and uniformity can vary between manufacturers. A less controlled foam structure leads to less consistent impedance along the cable’s length, which matters most in precision RF applications.

Outer Conductor (Shield)

Genuine LMR-400: Bonded aluminium foil tape plus tinned copper braid at 95% coverage. Shielding effectiveness: greater than 90 dB across the operating frequency range. The foil provides continuous coverage; the tinned copper braid provides mechanical strength and low-resistance bonding to connectors.

Generic OEM: Many cables use aluminium foil plus aluminium braid rather than tinned copper braid. Aluminium braid is lighter and cheaper. Shielding coverage is similarly quoted at 90–95%, but contact resistance at connector interfaces is higher because aluminium oxidises more readily than tinned copper. Shielding effectiveness figures for generic cables are rarely independently tested.

Outer Jacket

Genuine LMR-400: UV-stabilised black polyethylene (PE), rated from −40°C to +85°C, with verified UV resistance for direct outdoor exposure.

Generic OEM: Typically also black PE with the same temperature rating claimed, but UV stabiliser content and long-term UV resistance vary and are rarely independently verified. In Gulf climates — where cable-in-conduit temperatures can exceed 50°C and UV index peaks at 11+ in summer — jacket quality has a direct impact on cable service life.

Attenuation: Specified vs Observed

Times Microwave publishes the following attenuation figures for LMR-400. Generic OEM cables with solid copper conductors typically specify values close to these — within 5–15% at most frequencies. The gap tends to widen at higher frequencies.

Attenuation comparison bar chart: LMR-400 original vs generic OEM at 450MHz, 1GHz, 1.5GHz, 2.4GHz, 5.8GHz — Attenuation (dB/100m) at key RF frequencies — Times Microwave LMR-400 vs typical generic OEM. The gap widens at higher frequencies due to differences in conductor surface quality and the skin effect. Generic values are indicative — verify against the specific supplier’s datasheet.

Frequency	LMR-400 (Times Microwave)	Generic OEM (typical)
450 MHz	4.1 dB/100m	~4.5 dB/100m
900 MHz	5.9 dB/100m	~6.5 dB/100m
1 GHz	6.8 dB/100m	~7.5 dB/100m
1.5 GHz	8.4 dB/100m	~9.5 dB/100m
2.4 GHz	11.0 dB/100m	~12.5 dB/100m
5.8 GHz	17.5 dB/100m	~20+ dB/100m

The meaningful differences appear in three areas. First, attenuation at high frequencies: the skin effect amplifies any variation in conductor surface quality above 2 GHz. Second, batch-to-batch consistency: tight manufacturing tolerances mean each reel of genuine LMR-400 performs within a narrow, predictable range — OEM cables can vary more between production runs. Third, aged performance: connector interface oxidation (from CCA or aluminium braid) and jacket degradation can cause measurably higher losses after several years in outdoor installations.

Connector Fit and Termination

LMR-400 connectors (N-type, SMA, TNC) are tooled to the Times Microwave specification. OEM cables are dimensionally close, and in most cases the same connectors fit. However, tolerances on the foam dielectric outer diameter and braid outer diameter can vary slightly, occasionally causing loose connector bodies, incomplete crimping, or gaps at the connector-to-braid contact — any of which reduces shielding continuity and can increase contact resistance over time.

Problems arise most often when mixing genuine LMR-400 connectors with OEM cable, or vice versa. If you’re buying cable and connectors from the same OEM supplier, the two are typically dimensioned to fit each other.

Key Specifications Side-by-Side

Parameter	Times Microwave LMR-400	Generic OEM (typical)
Impedance	50Ω ± 1Ω	50Ω ± 1–2Ω
Centre conductor	Solid bare copper, 2.74mm	Solid copper or CCA, ~2.74mm
Dielectric	Foam PE, bonded	Foam PE
Outer conductor	Al foil + 95% tinned Cu braid	Al foil + Al or Cu braid
Shielding effectiveness	>90 dB (specified & verified)	85–90 dB (typically claimed)
Attenuation at 1 GHz	6.8 dB/100m	6.8–8.0 dB/100m (varies)
Velocity of propagation	85%	83–86%
Jacket	UV-stabilised black PE	Black PE (UV resistance varies)
Temperature rating	−40°C to +85°C	−40°C to +85°C (claimed)
Min bend radius	25mm (one-time), 38mm (repeated)	25–38mm (varies)
Certifications	UL, cUL, CE, RoHS	CE, RoHS (typically)
Country of manufacture	USA	China (typically)

Where the Difference Is Most Noticeable

Matrix showing cable quality impact by application type — Cable quality impact by application — the gap between genuine LMR-400 and generic OEM is minimal for short or low-frequency runs, and most significant for long IFL runs, high frequencies, harsh outdoor environments, and mission-critical systems.

The gap between genuine LMR-400 and a good generic alternative is modest in a benign environment — short runs, moderate frequencies, controlled temperature, indoor or sheltered installation. In these conditions, a well-made OEM cable performs adequately and the cost difference is meaningful.

The gap widens in several scenarios. On long IFL runs at L-band, the difference between 8.4 dB/100m and 9.5 dB/100m over 50 metres is 0.55 dB — noticeable but unlikely to break a link budget on its own. At 60m or more, or if the cable is ageing and developing connector degradation, the margin erodes further.

For outdoor installations in Gulf climates, sustained cable-in-conduit temperatures above 50°C combined with intense UV puts jacket quality under real stress. A jacket that begins cracking at year 3 on a rooftop installation creates a moisture path into the cable — and even small amounts of moisture ingress increase attenuation significantly and unpredictably.

In high-shielding-sensitivity applications — a receive antenna near a transmit path, or a dense urban RF environment — the difference between a verified >90 dB cable and an untested OEM cable can matter. And for mission-critical systems where uptime is measured commercially, the known provenance and verified specification of genuine LMR-400 removes one variable from a complex installation.

For less critical applications — a 10m WiFi antenna run, a lab test bench connection, or an indoor patch — a good-quality OEM cable is entirely reasonable.

On supplier claims.
Some OEM suppliers describe their cable as “LMR-400 standard” or “meets LMR-400 spec.” This typically means the cable is dimensionally compatible and broadly similar in construction — not that it has been tested and certified to Times Microwave’s specification. The distinction matters when specifying for a contract or when the installation needs to meet a particular shielding or attenuation requirement.

Frequently Asked Questions

Can I use generic LMR-400 cable with genuine LMR-400 connectors?

Usually yes — the dimensions are close enough that standard LMR-400 crimp connectors fit most OEM cables. It is worth verifying the outer diameter of the foam dielectric and the braid against the connector’s specification. Slight dimensional differences can occasionally cause a connector to seat loosely or not crimp to its full design depth.

Is CCA conductor a problem in RF cable?

At frequencies above a few megahertz, the skin effect concentrates current in the outer conductor surface, so RF performance of CCA approaches solid copper if the copper cladding is thick enough. The main practical concerns are mechanical: CCA work-hardens faster, is harder to solder, and aluminium is exposed if the copper cladding is damaged at a connector termination — leading to oxidation and increased contact resistance over time.

How do I identify if a cable has a CCA conductor?

Cut a short length and inspect the centre conductor cross-section. Solid copper is uniformly copper-coloured throughout. CCA shows a silvery aluminium core with a thin copper ring at the outside. You can also nick the surface with a sharp knife — if the material beneath the copper colour is silvery-grey, it is aluminium.

What certifications should I look for on a cable datasheet?

UL (or cUL for Canada) for fire rating, CE for the European market, and RoHS for materials compliance are the main ones. Generic cables often carry CE and RoHS but not UL, which matters if the installation is in a building that requires UL-listed cables in pathways. For specific applications — plenum environments, conduit, marine — look for the relevant jacket rating.

Is genuine LMR-400 available in the UAE?

Yes — Bravo Satcom stocks genuine LMR-400, LMR-600, and LMR-900 with N-type, SMA, and BNC termination options. Lead time for custom-cut lengths is typically 1–3 days.

Looking for LMR-400 for your installation?
Bravo Satcom stocks genuine LMR-400, LMR-600, and LMR-900 coaxial cable in the UAE, available cut to length with factory-terminated connectors. Our team can advise on cable selection for VSAT, broadcast, and RF installations across the GCC.

Contact us for a quote → | Browse cables in our shop →

Cable

What Is Cable Attenuation and Why Does It Matter?

Posted on July 22, 2026July 22, 2026 by admin

What Is Cable Attenuation?

Attenuation is the reduction in signal power that occurs as a signal travels along a cable. Every cable — no matter how well-made — loses a fraction of the signal it carries. The electrical energy that was launched into one end of the cable arrives at the other end weaker, because some of it was converted to heat by the cable’s internal resistance and by dielectric losses in the insulating material.

Attenuation is expressed in decibels per unit length (dB/m or dB/100m). This tells you how much loss you’ll accumulate for every metre of cable in your run.

Because the decibel scale is logarithmic, these losses add up quickly. Every 3 dB of loss halves the signal power. Every 10 dB of loss removes 90% of it. A 20 dB loss means only 1% of the original power reaches the far end.

dB Loss	Power remaining
1 dB	79%
3 dB	50%
6 dB	25%
10 dB	10%
20 dB	1%
30 dB	0.1%

This is why attenuation matters: a cable run that seems modest in length can strip out most of your signal if you’ve chosen the wrong cable type — and because the scale is logarithmic, there’s no gradual warning. You go from working to not working in a surprisingly short distance.

How Attenuation Is Measured and Specified

Manufacturers specify attenuation in dB per 100 metres at a set of standardised frequencies. A typical datasheet entry for LMR-400 looks like this:

At 450 MHz: 4.6 dB/100m
At 1 GHz: 6.8 dB/100m
At 2.4 GHz: 11.0 dB/100m
At 5.8 GHz: 17.5 dB/100m
At 12 GHz (Ku-band): ~30 dB/100m

To find the loss for your specific run, multiply the attenuation figure by the run length in metres and divide by 100:

Cable loss (dB) = (attenuation dB/100m × run length in metres) ÷ 100

Example: 35m of LMR-400 at 1 GHz:
Loss = (6.8 × 35) ÷ 100 = 2.38 dB

If the signal is at 12 GHz (Ku-band, not down-converted IF):
Loss = (30 × 35) ÷ 100 = 10.5 dB — a dramatic difference for the same cable and same distance.

Why Frequency Makes Attenuation Worse

This is the single most important thing to understand about cable attenuation: loss increases as frequency increases, and it does so steeply.

Two physical mechanisms drive this. Skin effect: at higher frequencies, current concentrates into a thin layer at the surface of the conductor. Less cross-sectional area carries the current, so resistance increases. Dielectric loss: the insulating material between the centre conductor and the shield absorbs a small amount of energy as the electromagnetic field oscillates through it — this absorption increases with frequency.

Both effects scale roughly with the square root of frequency. Go from 1 GHz to 12 GHz and attenuation goes up by roughly 3.5–4×. This is why Ku-band IFL specifications are so unforgiving compared to L-band.

Grouped bar chart comparing cable attenuation across frequencies for LMR-900, LMR-600, LMR-400, and RG-214 — Attenuation (dB/100m) for each cable type at key RF frequencies. LMR-900 loses 10.2 dB/100m at 12 GHz; LMR-400 loses 30 dB/100m at the same frequency — nearly 3× more loss for the same run length.

Cable Attenuation Comparison: LMR Series vs Legacy Coax

Not all coaxial cables are equal. The main variable is cable diameter: larger cables have lower attenuation because they have a bigger centre conductor (lower resistance) and a thicker dielectric. This is the core trade-off — larger cable, lower loss, harder to handle and route.

Cable	450 MHz	1 GHz	2.4 GHz	5.8 GHz	12 GHz (Ku)
LMR-900	1.5 dB/100m	2.7 dB/100m	4.2 dB/100m	6.5 dB/100m	10.2 dB/100m
LMR-600	2.5 dB/100m	4.1 dB/100m	6.4 dB/100m	10.0 dB/100m	16.5 dB/100m
LMR-400	4.6 dB/100m	6.8 dB/100m	11.0 dB/100m	17.5 dB/100m	30.0 dB/100m
LMR-240	7.6 dB/100m	11.5 dB/100m	18.8 dB/100m	—	—
RG-214	11.0 dB/100m	16.0 dB/100m	26.0 dB/100m	—	—

Values are approximate and vary by manufacturer. Always verify against the specific datasheet for the cable in use.

The difference between LMR-400 and RG-214 — two cables that look broadly similar — is dramatic. At 1 GHz, RG-214 loses more than twice as much signal per metre. For any professional RF installation, LMR-400 or better is the minimum acceptable specification.

Attenuation and VSAT IFL Runs: Real-World Limits

In a VSAT terminal, the cable connecting the indoor unit (modem) to the outdoor unit (BUC and LNB on the dish) is called the IFL (Interfacility Link). This is almost always coaxial, and attenuation directly sets the maximum usable run length.

Most VSAT systems allow a total IFL loss budget of roughly 8–12 dB, depending on the modem manufacturer’s specification. Exceed this, and the modem can no longer lock to the carrier — or it locks but at a degraded signal quality that causes errors under rain fade.

Horizontal bar chart showing maximum IFL run length for LMR-400, LMR-600, and LMR-900 at L-band and Ku-band — Maximum cable run lengths at a 10 dB budget. Outlined bars = max at L-band IF (what your VSAT modem uses). Solid bars = practical max at direct Ku-band (12 GHz). L-band IF runs are much longer because the IF frequency is lower.

Cable	Max run at L-band IF (10 dB budget)	Practical max at Ku-band
LMR-400	~147m	Up to 30–35m
LMR-600	~244m	Up to 60m
LMR-900	~370m	Up to 95m
RG-214	~62m	Not recommended

Note that VSAT IFL cables carry L-band IF signals (950 MHz – 2,150 MHz), not raw Ku-band — which is why the actual usable run lengths are much longer than a raw 12 GHz attenuation figure would suggest.

VSAT system diagram showing IFL coaxial cable connecting outdoor LNB and BUC to indoor modem — VSAT signal path. A single coaxial IFL cable carries the receive IF signal from LNB to modem, the transmit IF signal from modem to BUC, and the DC power for both outdoor units — all on the same coax.

The Other Sources of Signal Loss: Don’t Forget Connectors

Cable attenuation gets all the attention, but every connector junction in your system also introduces loss. A well-terminated N-type connector adds approximately 0.1–0.15 dB per connection. In a typical run with a connector at each end, that’s 0.2–0.3 dB — small but real.

A poorly made connector is a different story. A bad crimp, a loose centre pin, or oxidised contact surfaces can add 0.5–2 dB per connector — easily as much loss as metres of cable. Well-terminated N-type: 0.1–0.15 dB. Well-terminated SMA: 0.1–0.2 dB. BNC at L-band: 0.15–0.2 dB. Each adapter (N-to-SMA, etc.): add 0.2–0.3 dB. Poorly made connector: 0.5–2.0 dB.

For a long IFL run, minimise the number of connections. Run a single cable from modem to LNB/BUC where possible, and use weatherproof sealant on all outdoor connections to prevent moisture ingress, which dramatically increases connector loss.

Rule of thumb: Calculate your cable budget before you order.
Add up (attenuation dB/100m × run length ÷ 100) + (number of connectors × 0.15 dB). If the total exceeds your modem’s IFL loss spec, step up to the next cable size. It’s much cheaper to order the right cable before installation than to troubleshoot a marginal link six months later.

How to Reduce Cable Attenuation

You can’t eliminate attenuation from a cable, but you can manage it effectively:

1. Choose a larger cable diameter. LMR-600 has roughly 40% lower attenuation than LMR-400 at the same frequency. Where run length is pushing your budget, step up a cable size.

2. Shorten the run. Every extra metre adds loss. Position the indoor unit close to the cable entry point, and use short patch cables rather than routing a single long run around obstacles.

3. Use quality connectors and terminate properly. A well-made crimp connection loses 0.1 dB. A poor one can lose 2 dB. Use the correct die for the connector, and inspect the finished crimp before sealing.

4. Seal outdoor connectors. Moisture in a connector or cable jacket multiplies attenuation significantly. Self-amalgamating tape over all outdoor connections is non-negotiable.

5. Avoid sharp bends. Exceeding a cable’s minimum bend radius compresses the dielectric and increases attenuation. LMR-400 has a minimum bend radius of 25mm; LMR-600 is 38mm.

6. Check for impedance mismatches. Mixing 50Ω and 75Ω cables or connectors creates reflection losses. In RF systems, keep everything 50Ω (VSAT, two-way radio). In broadcast distribution, keep everything 75Ω.

When attenuation is not your problem.
If your signal degrades intermittently — worse in rain, fine on clear days — the cable attenuation itself is probably fine. Intermittent issues usually point to a failing connector, moisture ingress, or a loose adapter. True cable attenuation is steady and predictable. Rule out connectors first.

Frequently Asked Questions

What is a good level of cable attenuation?

For VSAT IFL runs, total cable + connector loss should stay within your modem’s specification — typically 8–12 dB. For general RF work, aim to keep cable loss under 3 dB (50% power loss) where possible. Beyond 3 dB, the impact starts to compound with other system losses.

Does temperature affect cable attenuation?

Yes, modestly. Most coaxial cables lose an additional 0.4–0.7% per degree Celsius above 20°C. In the Gulf and MENA region, where cable-in-conduit temperatures can reach 60–70°C in summer, this can add 15–30% to the datasheet figure. For long outdoor runs in hot climates, derate accordingly.

Can I join two cables to extend my run?

Yes, using a barrel connector, but every junction adds 0.2–0.3 dB of connector loss and a potential point of moisture ingress. For short joins inside an enclosure, this is acceptable. For long outdoor runs, avoid splices and use a single continuous cable with proper weatherproofing.

What does 10 dB of cable loss actually mean for my link?

10 dB of loss means only 10% of the transmit power launched into the cable reaches the far end. For a VSAT BUC putting out 4W (36 dBm), 10 dB of IFL loss means only 0.4W (26 dBm) reaches the antenna port. Depending on your link margin, this can still work — or it can push you below the modem’s receive threshold under rain fade.

LMR-400 vs RG-214 — which should I use?

LMR-400 in almost every case. LMR-400 has less than half the attenuation of RG-214 at L-band, it’s lighter, more flexible, and has a better-specified minimum bend radius. RG-214 is a legacy military specification cable that is sometimes mistakenly specified for modern VSAT and RF installations where LMR-400 or LMR-600 is far more suitable.

Need help selecting the right cable for your installation?
Bravo Satcom stocks LMR-400, LMR-600, and LMR-900 coaxial cables with N-type, SMA, and BNC termination options. Our team can help you calculate your link budget and recommend the correct cable for your VSAT, broadcast, or RF installation.

Contact our team for a cable recommendation → | Browse cables in our shop →

Cable

Fiber Optic vs Coaxial Cable: Key Differences, Uses & Which to Choose

Posted on July 18, 2026July 18, 2026 by

When planning a satellite, VSAT, or telecom installation, one of the first decisions you face is cable type. Fiber optic and coaxial cable both carry signals from point A to point B — but they work in completely different ways, and choosing the wrong one means poor performance, expensive rework, or a system that won’t scale.

This guide breaks down everything you need to know: how each cable works, where each excels, and how to make the right call for your specific project.

Cross-section diagram comparing the internal layers of coaxial cable (LMR-400) versus fiber optic cable (SMF OS2) — Left: Coaxial cable carries both RF signal and DC power through a copper center conductor. Right: Fiber optic cable carries light only — no DC power capability.

What Is Coaxial Cable?

Coaxial cable carries RF signals as electrical waves along a center copper conductor, insulated from a surrounding braid or foil shield by a dielectric foam core. The shield keeps the signal contained and reduces external interference. An outer PE or PVC jacket provides mechanical and weather protection.

In VSAT and satellite applications the most common types are LMR-400 (standard Ku-band IFL, runs to ~30m), LMR-600 (medium runs to ~60m), LMR-900 (long runs to 80m+), and legacy RG-214. For broadcast and CATV distribution, 75Ω RG-6 is standard.

The capability that makes coaxial indispensable for satellite work: it carries DC power alongside the RF signal. The same cable that carries your IF signal from modem to LNB also delivers the 13V or 18V DC that powers the LNB — plus the 22 kHz polarisation tone — and the 24–48V DC that drives the BUC. No other single cable can do this.

What Is Fiber Optic Cable?

Fiber optic cable carries signals as pulses of light through a glass core, surrounded by cladding (a lower-refractive-index glass layer that traps light inside by total internal reflection), a protective buffer coating, and an outer jacket. There are no copper conductors — signals travel at the speed of light with virtually no attenuation over distance.

Two main types exist: single-mode fiber (SMF, OS1/OS2) for long-distance runs up to 40+ km, and multi-mode fiber (MMF, OM3/OM4) for shorter data links up to ~300–550m. For telecom backhaul and building-to-building links, SMF OS2 is the current standard.

The defining advantages: attenuation of just 0.2 dB/km at 1550 nm (versus approximately 6.6 dB/100m for LMR-400 at 1 GHz), complete immunity to electromagnetic interference, and effectively unlimited bandwidth. The defining limitation: fiber cannot carry DC power. Any powered equipment at the far end requires a separate power cable.

Signal Attenuation: The Numbers That Decide Everything

Signal loss — attenuation — is the single most important factor in cable selection. Here’s how the main cable types compare at 100 meters:

Bar chart showing signal attenuation per 100 meters for fiber optic OS2, LMR-900, LMR-600, LMR-400, RG-6 and RG-58 cables at 1 GHz — Signal loss per 100m at 1 GHz. Fiber OS2 loses virtually nothing over any practical run. RG-58 and RG-6 are unsuitable for any professional RF application beyond short jumpers.

At Ku-band frequencies (12 GHz), coaxial losses are significantly higher still — LMR-400 loses approximately 30 dB per 100m at Ku-band, which is why VSAT IFL runs must be kept short or upgraded to larger cable (LMR-600 or LMR-900).

Fiber Optic vs Coaxial: Full Comparison

Feature	Coaxial Cable (LMR-400)	Fiber Optic (SMF OS2)
Signal medium	Electrical (RF waves)	Light (photons)
Attenuation @ 1 GHz	6.6 dB / 100m	0.02 dB / 100m
Attenuation @ Ku-band (12 GHz)	~30 dB / 100m	N/A — not RF
Max VSAT IFL run (Ku-band)	30m (LMR-400) · 60m (LMR-600) · 80m+ (LMR-900)	Not suitable for IFL
Max data run (1 Gbps)	~100m (Cat6 Ethernet)	10+ km (SMF)
EMI immunity	Partial — braid reduces, does not eliminate	Complete — light is unaffected by EMI
DC power over cable	✓ Yes — LNB 13/18V + BUC 24–48V	✗ No — separate power cable required
RF signal (native)	✓ Yes	✗ No — requires optical conversion
Bandwidth	DC to 40 GHz (LMR-600)	Practically unlimited (>100 THz)
Field termination	Easy — crimp tool + N-type / SMA / BNC	Requires fusion splicer + cleaver
Security	Can be passively tapped	Tap causes detectable signal loss
Ground loop / surge risk	Yes — copper conductor	None — glass is non-conductive
Weight	Heavier	Very light
Cable cost	Lower	Moderate to high
Equipment cost	Lower	Higher (transceivers, media converters)
Typical connectors	N-type, F, BNC, SMA, TNC	LC, SC, ST, FC

When to Use Coaxial Cable

✓ Coaxial is the right choice for:

VSAT and satellite IFL runs — Mandatory. Your satellite modem must deliver DC power to the LNB (13V/18V + 22 kHz polarisation tone) and BUC (24–48V) through the same cable that carries the IF signal. Use LMR-400 up to 30m, LMR-600 to 60m, LMR-900 to 80m+ at Ku-band.

Antenna feedlines — VHF/UHF, cellular base station, and microwave antenna connections are always coaxial. LMR-400 is the standard for fixed base station feedlines; LMR-600 for tower runs over 20m.

RF signal distribution — Splitters, combiners, amplifiers, RF patch panels: anywhere you’re routing a live RF signal, coaxial connections are required throughout the chain.

CCTV and analog video — Analog camera systems (HD-CVI, TVI, AHD) use RG-59 or RG-6. Still widely deployed throughout the GCC due to existing cable infrastructure.

Remote DC power delivery — Any equipment that needs power over the cable (BUC on a tower, LNB on a dish) requires coaxial IFL. There is no alternative.

Field installations — Coax connectors are field-terminable with a hex crimp tool. Fiber fusion splicing requires capital equipment and a clean environment — coax wins on field flexibility every time.

When to Use Fiber Optic Cable

✓ Fiber optic is the right choice for:

Long data backbone runs (>100m) — Any network link over 100 meters at Gigabit speeds or higher should be fiber. SMF supports 10G Ethernet over 10+ km without amplifiers.

Building-to-building links — Outdoor aerial or buried runs between buildings need fiber for ground-loop isolation and lightning surge protection. Copper cable between separate structures can conduct a surge that destroys equipment at both ends.

High-EMI environments — Generator rooms, industrial motor drives, high-voltage transformer enclosures: fiber is completely immune to electromagnetic interference regardless of the surrounding electrical noise.

High-bandwidth data (40G / 100G / 400G) — These speeds require fiber. Not achievable over coaxial cable at any practical distance.

Security-critical links — Fiber cannot be intercepted passively. Any physical tap causes a measurable signal loss that optical monitoring can detect and alert on.

Harsh or marine environments — Fiber is immune to salt air corrosion, moisture ingress effects on signal quality, and temperature-driven impedance changes.

Why VSAT Always Uses Coaxial — Without Exception

Diagram showing a VSAT installation with coaxial IFL cable between the outdoor unit and satellite modem, and fiber optic or Cat6 cable between the modem and office network — In a VSAT installation, coaxial cable (LMR-400/600/900) is mandatory for the IFL between the outdoor unit and modem — it carries both the RF signal and DC power to the BUC and LNB. Fiber or Cat6 handles the IP data backbone from modem to the office network.

In any VSAT installation — from a single maritime terminal to a large teleport earth station — the IFL between the satellite modem and the outdoor unit must be coaxial cable. The reason is simple: the modem or ODU controller delivers DC power to the LNB and BUC through the same coaxial IFL that carries the IF signal. Fiber optic cable cannot carry DC power.

Fiber-based IF extension systems do exist. They use optical modulators and demodulators with separate power injectors to extend IFL runs beyond 100 meters in large earth station facilities. But these are expensive, complex installations reserved for sites where very long cable runs make standard coax impractical. For any typical VSAT site, coaxial cable is the correct and only practical IFL solution.

Frequently Asked Questions

Can I replace my VSAT coaxial IFL with fiber optic cable?

Not without additional equipment. The BUC and LNB require DC power that can only be delivered over coaxial cable in a standard installation. Fiber-based IF extension systems exist for very long runs (>100m) in large facilities, but they require optical modulators and separate power injectors — significant cost and complexity. For any typical VSAT installation, coaxial cable is the correct IFL choice.

Which has less signal loss — fiber optic or coaxial?

Fiber wins by a dramatic margin for data. LMR-400 loses approximately 6.6 dB per 100 meters at 1 GHz — and ~30 dB per 100m at Ku-band (12 GHz). Single-mode fiber OS2 loses just 0.2 dB per kilometer at 1550 nm. Over a 100m run, fiber loses roughly 0.02 dB versus LMR-400’s 6.6 dB — about 330× less attenuation. However, this comparison only applies to data signals. For native RF signals (satellite IF, antenna feedlines), there is no “fiber alternative” without conversion equipment.

Is fiber optic cable more expensive than coaxial?

Fiber cable typically costs more per meter, and field termination requires a fusion splicer — significant capital equipment. However, for long data backbone runs where coax would require inline amplifiers or multiple segments, fiber often becomes cost-competitive overall. For short RF applications under 50 meters, coaxial cable is almost always the lower-cost total solution.

Can fiber optic cable be used as an antenna feedline?

No — not without conversion equipment. Fiber carries light signals, not analog RF. An antenna feedline must be coaxial to carry the raw RF signal between the antenna and the radio or satellite modem. Any fiber in an RF path requires RF-to-optical conversion at both ends, adding cost and complexity that makes it impractical for standard installations.

What coaxial cable should I use for Ku-band VSAT?

Use LMR-400 for IFL runs up to 30 meters at Ku-band, LMR-600 for 30–60 meters, and LMR-900 for runs beyond 60 meters. All outdoor sections should use weatherproof N-type connectors with proper sealing tape. Never use RG-6 or RG-58 for VSAT — their attenuation at Ku-band is far too high even for short runs.

Need coaxial cable for your VSAT or satellite installation?
BravoSatcom stocks LMR-400, LMR-600, LMR-900 and IFL cables. We ship across the GCC.
Shop Cables →

VSAT

Newtec vs iDirect Satellite Modems: A Complete UAE Buyer’s Guide (2026)

Posted on July 12, 2026July 12, 2026 by admin

Comparison of ST Engineering iDirect Dialog, Evolution, and Velocity satellite platforms

If you’re comparing Newtec and iDirect satellite modems for a UAE, KSA, or wider GCC deployment, there’s one thing you should know before you decide anything: since 2021, they’re the same company.

Newtec was acquired by ST Engineering in 2020. Then in 2021, ST Engineering completed its acquisition of iDirect. Both are now part of ST Engineering iDirect — one manufacturer, one roadmap, one support organisation.

That doesn’t mean the modems are interchangeable. Newtec’s platform (called Dialog) and iDirect’s legacy platform (called Evolution) are still distinct networks with different modems, and buyers regularly have to choose between them. But framing the decision as “Newtec vs iDirect” is now like asking whether you want a Toyota Corolla or a Lexus — different products, same parent.

This guide breaks down what’s actually different, which modem fits which use case, and how the choice looks from the UAE distributor perspective.

The 2020–2021 merger: what changed for buyers

For years, Newtec (based in Belgium) and iDirect (based in Virginia, USA) competed head-to-head in the enterprise VSAT market. Newtec built the Dialog platform. iDirect built the Evolution and Velocity platforms. Buyers had to pick a side because networks were closed to each other.

Then Singapore-based ST Engineering completed both acquisitions and unified them into ST Engineering iDirect in early 2021. Since then:

Newtec’s modem line kept its Dialog naming — MDM2510, MDM3315, MDM6000, MDM9000, plus SMB board-level variants.
iDirect’s Evolution and Velocity platforms remain in service — iQ series, X7, X1, plus network hubs.
The product roadmap is now consolidated. New development happens under one engineering organisation, and platforms are progressively converging.
All modems are sold as “ST Engineering iDirect” branded products, though older Newtec-branded and iDirect-branded stock is still in the channel.

For a buyer, this means: if you’re already on a Newtec Dialog network, you continue with Dialog modems. If you’re on iDirect Evolution, you continue with Evolution — for now — but the long-term direction is clear.

The three platforms explained

Decision tree for choosing between Newtec MDM2510, MDM3315, iDirect iQ200 and X7 satellite modems in the UAE

Any modem you’re evaluating belongs to one of three network platforms. This is the actual decision axis — not the brand name.

Dialog (formerly Newtec)

Dialog is the flagship multi-service platform. It’s designed for enterprise VSAT, cellular backhaul, maritime, and government applications. Its signature is Mx-DMA® — a return-link technology that combines the flexibility of MF-TDMA with the on-demand bandwidth allocation of SCPC. In practice, Mx-DMA gives Dialog networks better link efficiency and higher availability than pure MF-TDMA.

Dialog supports DVB-S2X wideband forward carriers up to 500 Msps, so a single hub can deliver hundreds of Mbps to remote sites.

Evolution (legacy iDirect)

Evolution is the older iDirect platform. It’s proven, widely deployed across corporate VSAT networks in the Middle East and Africa, and still fully supported. Its return technology is A-TDMA and SCPC, without Mx-DMA. Evolution modems are typically simpler and less expensive at the low end.

Some Evolution modems (like the X7) are approaching end-of-life status and are being replaced by Dialog equivalents (the MDM3315 in the X7’s case).

Velocity (iDirect HTS/mobility)

Velocity is iDirect’s platform for HTS (high-throughput satellite) networks and mobility applications — think in-flight connectivity, cruise ships, oil rigs. It uses DVB-S2X adaptive modulation with global beam-hopping support. Most enterprise buyers won’t touch Velocity; it’s built for HTS operators and mobility service providers.

Modem-by-modem comparison

Here are the modems most UAE buyers actually encounter, side by side:

Modem	Platform	Origin	Target Use	Peak Data Rate	Return Tech
MDM2510	Dialog	Newtec	SOHO / SME, POS	150 Mbps fwd	Mx-DMA, MF-TDMA
MDM3315	Dialog	Newtec	Enterprise, maritime, backhaul	150/70 Mbps	Mx-DMA MRC, MF-TDMA, SCPC
MDM6000	Dialog	Newtec	High-end enterprise, DTH contribution	500+ Mbps	Mx-DMA, SCPC
iQ200	Evolution	iDirect	SOHO / SME	~50 Mbps	A-TDMA
iQ Desktop 200	Evolution	iDirect	Desktop SOHO	~50 Mbps	A-TDMA
X7	Evolution	iDirect	Enterprise (EOL – succeeded by MDM3315)	90 Mbps	A-TDMA, SCPC
X1	Evolution	iDirect	Low-cost remote	~20 Mbps	A-TDMA

A few practical notes:

The MDM2510 and the iQ200 target the same market — small offices, retail, banking, POS networks. If you have a choice, MDM2510 gives you more headroom and modern Mx-DMA efficiency. iQ200 is often cheaper on the ground and easier to deploy on existing iDirect networks.

The MDM3315 replaces the X7. If a client has an X7 fleet, MDM3315 is the natural upgrade path. It offers a dual receiver, higher throughput, and a 4-port Ethernet switch versus the X7’s single receiver and simpler I/O.

The MDM6000 is a different animal. It’s not a competitor to the iQ200 or X7 — it’s for high-end backhaul and DTH contribution where you need 500 Msps+ of forward capacity.

How to choose: a decision guide

Newtec and iDirect merged into ST Engineering iDirect in 2021 — visual timeline of the acquisition

The right modem depends less on brand preference and more on what network you’re joining.

If you’re joining an existing Dialog network (many enterprise VSAT operators in the Middle East run Dialog): you must buy a Dialog modem. Options: MDM2510 for SOHO, MDM3315 for enterprise, MDM6000 for high-throughput.

If you’re joining an existing iDirect Evolution network: you’ll typically buy an Evolution modem. Options: iQ200 or X1 for entry-level, X7 or MDM3315 for enterprise. Note that new Evolution deployments are becoming rare — most operators are migrating.

If you’re deploying a greenfield VSAT network (you’re setting up the hub too): Dialog is the strategic choice. Better roadmap, better return efficiency, aligned with ST Engineering iDirect’s future direction.

By application:

SOHO / retail / banking / POS: MDM2510 (Dialog) or iQ200 (Evolution). Both do the job. Choose based on the network you’re joining.
Enterprise fixed VSAT: MDM3315 on Dialog, or MDM3315 replacing X7 if you’re on Evolution and upgrading.
Maritime: MDM3315 or iQ200 with OpenAMIP support. Verify vessel-specific stabilization requirements.
Cellular backhaul: MDM3315 or MDM6000 depending on cell load.
High-throughput DTH / broadcast contribution: MDM6000.
Government / secure networks: MDM3315 with 256-bit AES option, or purpose-configured MDM6000.

UAE and GCC considerations

A few things matter specifically for buyers in the region:

TDRA type-approval. Any satellite terminal deployed in the UAE requires TDRA (Telecommunications and Digital Government Regulatory Authority) type-approval. All current ST Engineering iDirect modems have approvals in place, but confirm the specific model and firmware version with your distributor before shipping.

Regional satellite compatibility. Yahsat’s Al Yah 1, Al Yah 2, and Al Yah 3 (Ka-band HTS) are the dominant satellites for enterprise VSAT in the UAE. Dialog and Evolution modems both operate on these fleets — the network operator determines platform choice. Thuraya is a separate GEO/MSS system that doesn’t use these modems.

Support and lead times. Post-merger, spares and support for both Dialog and Evolution modems flow through ST Engineering iDirect’s regional partners. Working lead times from Europe or the US into JAFZA are typically 2–4 weeks for stock items, longer for configured modems that need factory provisioning.

Local availability. Bravo Satcom stocks the MDM2510, MDM3315, and iQ200 for UAE and GCC delivery, along with SMW LNBs, iLBs, ANT2025 and ANT2035 antennas from the wider Newtec/ST Engineering ecosystem. Contact us for current stock and lead times.

Frequently asked questions

Are Newtec and iDirect the same company?

Yes — since 2021. ST Engineering acquired Newtec in 2020 and iDirect in 2021, then unified them as ST Engineering iDirect. Both product lines continue under one brand.

Can iDirect Evolution modems work on a Newtec Dialog network?

No. Evolution and Dialog are separate network platforms. Modems are not cross-compatible. Choose the modem that matches your network hub.

Which modem is better for a UAE small-office VSAT?

The MDM2510 offers modern DVB-S2X and Mx-DMA return-link efficiency. The iQ200 is often cheaper and simpler to deploy on existing iDirect networks. If you’re joining a Dialog network, choose MDM2510. If you’re joining an Evolution network, choose iQ200.

What replaces the iDirect X7?

The MDM3315 is the direct replacement. It offers dual receivers, higher throughput, and a 4-port Ethernet switch while maintaining a familiar form factor for X7 users.

Where can I buy Newtec or iDirect modems in Dubai?

Bravo Satcom supplies both product lines to UAE and GCC customers with local warehousing and support. Contact us for a quote on MDM2510, MDM3315, iQ200, or any related VSAT equipment.

Is MDM2510 still in production in 2026?

Yes. It remains an active product in the ST Engineering iDirect Dialog portfolio for SOHO and SME deployments.

Bottom line

The “Newtec vs iDirect” question is now really “Dialog vs Evolution”, and increasingly the answer is Dialog for new deployments. But if you’re joining an existing network, the choice is usually made for you.

For UAE and GCC buyers, the practical shortlist is:

Small office / retail / POS: MDM2510 (or iQ200 if on Evolution)
Enterprise / maritime / backhaul: MDM3315
High-throughput / contribution: MDM6000

Contact Bravo Satcom for current stock, pricing, and TDRA-approval confirmation on any of these models.

Cable

How to Crimp LMR Connectors Correctly: Step-by-Step Guide

Posted on July 7, 2026July 7, 2026 by rai

A poorly terminated connector is the number one cause of signal degradation on an otherwise well-designed RF installation. LMR cables — particularly LMR-400 — are used on VSAT IFL runs, radio base station feedlines, and outdoor antenna installations where the connector is exposed to weather, vibration, and long-term stress. Getting the crimp right the first time saves you a troubleshooting call six months later.

This guide walks through the complete termination process for LMR-400 with an N-type crimp connector — the most common combination in VSAT and radio work — and covers the critical dimensions, tools, and mistakes that separate a reliable termination from a future fault.

LMR-400 Cable Preparation — Strip Stages

Jacket

Full length

Braid exposed

25.4 mm

(fold back)

Dielectric

12.7 mm

(stripped)

Centre pin

12.7 mm

exposed

Outer jacket (PE)

Braid + foil shield

Foam PE dielectric

Copper centre conductor

LMR-400 N-type crimp | Dimensions per Times Microwave spec | bravosatcom.com

What You’ll Need

Getting the right tools matters more than most people realise. Undersized or worn tooling causes crimp failures that are invisible to the eye but catastrophic for RF performance.

Tool	Purpose	Notes
Coax cable cutter	Clean, square cable cut	Never use wire cutters or a hacksaw — both distort the cable end
Rotary coax stripper	Strip jacket, braid, dielectric to exact dimensions	Set blade depths for LMR-400 specifically
Hex crimp tool + die	Compress ferrule onto braid	LMR-400 N-type typically requires 0.429″ hex die — check connector spec
Utility knife / deburring tool	Clean dielectric end, remove stray braid strands
Vernier calipers	Verify strip dimensions	Optional but recommended for critical installs
Multimeter	Post-crimp continuity test	Mandatory before putting the cable into service

Connector types: This guide covers crimp connectors — the most common in field work. Times Microwave also makes EZ-400 compression connectors (faster, single-action, requires the matching tool) and solder-type connectors. The cable prep dimensions are similar but confirm against your specific connector’s installation sheet.

Strip Dimensions for LMR-400 N-Type Crimp

These are the published Times Microwave strip dimensions for LMR-400 with a standard N-type crimp connector. Write these on your tool bag if you do this regularly.

Strip	Dimension	What It Exposes
Outer jacket removal	25.4 mm (1.00″)	Braid for fold-back
Braid fold-back point	12.7 mm (0.50″) from jacket end	Positions braid over ferrule
Dielectric removal	12.7 mm (0.50″) from fold point	Centre conductor
Centre conductor trim	Flush with connector pin face	Clean mating contact

Dimensions vary between connector manufacturers. Always cross-check against your specific connector’s installation sheet before terminating.

Step-by-Step: N-Type Crimp on LMR-400

Cut the cable square. Use a proper coax cutter. The cut must be clean, flat, and perpendicular. Inspect: jacket, braid, dielectric, and centre conductor must all be concentric and undamaged. Any burr or angle — cut again.

Slide on the crimp ferrule first. Before stripping anything, slide the crimp ferrule (small metal ring) onto the cable with the open end facing the cable end. This is the most commonly forgotten step. You cannot install it after the connector body is on.

Strip the outer jacket — 25.4 mm. Set your rotary stripper and rotate 2–3 times, then pull the jacket off cleanly. Inspect the braid — intact, no nicks, no cut strands. Remove any cut braid strands before proceeding.

Fold back the braid — at 12.7 mm. Comb the braid wires back evenly over the outer jacket. Spread uniformly around the full circumference — avoid bunching. Bunched braid concentrates crimp force on one side and reduces shield effectiveness.

Strip the dielectric — 12.7 mm. Remove foam dielectric to expose the centre conductor. The cut must be clean — no gouges or teeth marks on the copper. Even minor nicks increase PIM and create stress crack points under vibration.

Inspect before assembly. Blow out loose strands. Verify strip dimensions. Confirm no braid strands are on the dielectric. Check the centre conductor is round and undamaged. A 30-second inspection here prevents a re-termination in the field.

Install the connector body. Slide the connector body onto the cable. The centre conductor passes through the contact pin and protrudes slightly — trim flush with the pin face. The braid seats inside the connector’s braid seat area. Push fully home until it seats firmly.

Slide the ferrule into position. Slide the crimp ferrule forward until it butts against the rear of the connector body, sitting over the folded braid.

Crimp. Place the ferrule in the correct hex die. Close the handles with a single smooth, firm stroke until the ratchet releases. One complete ratchet cycle only — do not over-crimp (distorts the body) or under-crimp (ferrule slips).

Inspect the finished crimp. The ferrule should be uniformly hexagonal, no cracking or oval distortion. Firm tug — connector should not move. No braid strands protruding. Centre pin flush or just proud of the mating face.

Common Mistakes

Mistake	Consequence	Fix
Forgetting the ferrule before assembly	Must cut off connector and restart	Slide ferrule on as Step 2, every time
Nicked centre conductor	PIM, cracking under vibration, future open	Re-cut cable end and re-terminate
Stray braid strands on dielectric	Dead short centre-to-outer	Inspect under good light before inserting body
Wrong hex die size	Under-crimp — passes pull test, fails in field	Always match die to connector spec sheet
Bunched braid fold	Non-uniform crimp, reduced shield coverage	Comb braid evenly around full circumference
Centre pin too long	Bottoms out in mating connector, damages both	Trim flush with pin face
RG-8 connector on LMR-400	Wrong bore — mechanically and electrically poor	Always use connectors specified for LMR-400

Testing Your Termination

Every terminated connector should pass three checks before the cable goes into service:

① Visual Inspection

Ferrule uniformly hexagonal. No braid strands protruding. Centre pin flush. Connector firmly seated — no movement under hand tug.

② DC Continuity (Multimeter)

Centre pin to centre pin: continuity. Centre pin to outer body: open circuit. Any short = failed termination, re-terminate.

③ Return Loss / VSWR (if available)

Good LMR-400 termination: >25 dB return loss (VSWR <1.12:1) at 1 GHz. Worse than 20 dB (VSWR >1.22:1) indicates a problem.

Connector Compatibility Quick Reference

Always match the connector spec to your cable. Using an LMR-400 connector on LMR-600 is the most common ordering mistake.

LMR Cable	Standard Connector	Crimp Die (typical)	Notes
LMR-195	N-type, SMA, BNC	Per connector spec	Check braid OD matches
LMR-240	N-type, SMA	Per connector spec
LMR-400	N-type	0.429″ hex (typical)	Standard VSAT IFL
LMR-600	N-type, 7/16 DIN	Different body	Do NOT mix with LMR-400 connectors
LMR-900	N-type, 7/16 DIN	Large-body only	7/16 DIN preferred for high power

For a full cable series comparison, see the Times Microwave LMR Series guide.

FAQ

Can I reuse an LMR connector after removing it?
No. Once a crimp ferrule has been compressed, it cannot be re-used. Cut the connector off, re-prepare the cable end, and use a new connector.

What’s the minimum pull-out force for a properly crimped LMR-400 connector?
Times Microwave specifies approximately 45 kg (100 lbs) minimum pull-out strength for a correctly crimped LMR-400 N-type. If yours pulls off with hand force, the crimp failed.

Can I use a standard N-type connector meant for RG-8 on LMR-400?
No. LMR-400 has a different OD, braid construction, and dielectric. Using an RG-8 connector produces a mechanically and electrically poor termination. Always specify connectors made for LMR-400.

How do I know if my crimp tool die is worn?
A worn die produces ferrules that are out-of-round or show uneven hex faces. Check with calipers — if in doubt, replace the die. A worn die is cheaper to replace than a failed installation.

What’s the difference between silver and gold centre pins?
Silver-plated pins are standard for VSAT work. Gold pins appear in some lower-frequency or high-reliability connectors. For LMR-400 N-type in VSAT IFL work, silver-plated is correct.

Need LMR Cables and Connectors?

Bravo Satcom supplies Times Microwave LMR cables and N-type connectors for VSAT and radio installations across the UAE and GCC. We stock LMR-240, LMR-400, and LMR-600 with matching crimp and compression connectors.

→ Browse cable products → Request a quote

VSAT

How to Choose BUC Power for VSAT: A Practical Guide

Posted on July 5, 2026July 5, 2026 by rai

Diagram showing five factors that determine VSAT BUC output power: antenna size, rain fade margin, frequency band, satellite G/T, and data rate — Five factors feed into your BUC power requirement. Antenna gain and satellite G/T work in your favour; rain fade and higher data rates work against you. The BUC power bridges the gap.

What BUC Output Power Actually Does

The BUC’s job is to amplify your uplink signal to a level the satellite can receive. The key metric is EIRP — Effective Isotropic Radiated Power — the combination of your antenna gain and BUC output power:

EIRP (dBW) = BUC Output Power (dBW) + Antenna Gain (dBi) − Feed and Cable Losses (dB)

The satellite operator specifies a minimum uplink EIRP your terminal must achieve to hold the link at the required carrier-to-noise (C/N) at the hub. Your BUC power and antenna size are interchangeable in the link budget — a larger dish needs less BUC power to hit the same EIRP, and vice versa. Understanding this trade-off is the key to smart BUC selection.

Factor 1: Antenna Size

This is the single biggest lever in the link budget. Antenna gain scales with aperture: doubling the dish diameter adds approximately 6 dB of gain — equivalent to quadrupling your BUC’s output power.

Antenna Diameter	Approx. Gain (Ku-band ~14 GHz)	Relative EIRP vs 0.75m
0.75m	~38 dBi	Baseline
0.9m	~40 dBi	+2 dB
1.2m	~43 dBi	+5 dB
1.8m	~47 dBi	+9 dB
2.4m	~50 dBi	+12 dB

A 2.4m dish achieves roughly 12 dB more EIRP than a 0.75m dish at identical BUC power — the same as multiplying BUC output by 16×. If you’re constrained on dish size (rooftop, aesthetics, vessel), budget for a higher-power BUC to compensate.

Factor 2: Frequency Band

The frequency band determines free-space path loss and rain fade sensitivity:

Band	TX Frequency	Rain Fade Risk	Typical VSAT Use
C-band	5.85–6.425 GHz	Very low (near immune)	Maritime, tropical, broadcast
Ku-band	13.75–14.5 GHz	Moderate	Standard enterprise VSAT
Ka-band	27.5–31 GHz	High (spot beams offset)	High-throughput broadband

For the same data rate and availability, Ka-band requires more power margin than Ku-band, while C-band needs less but uses larger antennas for equivalent gain.

Factor 3: Rain Fade Margin

Rain absorbs and scatters RF signals — the higher the frequency, the worse the effect. Rain fade margin is the extra power budget reserved to keep the link open during heavy precipitation.

Region	Rain Fade Margin — Ku-band (99.5% availability)
UAE / GCC (arid)	1–2 dB
Mediterranean / Southern Europe	2–4 dB
Sub-Saharan Africa	5–8 dB
Southeast Asia / tropical	8–12 dB

For a site in Dubai, 2 dB of rain fade margin is typically sufficient at Ku-band — often the difference between a 1W and 2W BUC. For a site in Lagos or Jakarta with the same link requirement, you may need 3–4× more BUC power just to cover rain fade.

Factor 4: Satellite G/T

Not all satellite transponders are equal. A high-power spot beam pointed at the Middle East (such as Yahsat Y1A) has a better uplink G/T, meaning the satellite is more sensitive to your signal — you need less transmit EIRP to achieve the same link quality at the hub.

A wide-area global beam covering multiple continents will have lower G/T, requiring more transmit power from your terminal. Always obtain a link budget from your satellite operator or service provider — they will specify the minimum EIRP your terminal must achieve, which determines your BUC power requirement given your antenna size.

Factor 5: Data Rate and Modulation

Higher data rates require more bandwidth or more efficient modulation. High-order modulation (16APSK, 32APSK) packs more bits per Hz but demands a stronger, cleaner signal — higher Eb/N₀ at the hub — which requires more transmit EIRP.

A low-data-rate monitoring link (64 kbps, QPSK) may work fine with a 1W BUC. A high-throughput corporate broadband link (10+ Mbps, 16APSK) may need a 4W–8W BUC on the same dish.

BUC Power Quick-Selection Guide

Starting-point guidance for Ku-band VSAT in the GCC/MENA region. Always confirm with a full link budget from your service provider.

Application	Antenna Size	BUC Power	Notes
Remote monitoring / IoT VSAT	0.75m – 0.9m	1W	Low data rate, QPSK
Small office broadband (TDMA)	0.9m – 1.2m	1W – 2W	Standard managed VSAT plans
Enterprise VSAT (SCPC)	1.2m – 1.8m	2W – 4W	Dedicated bandwidth
High-throughput / corporate	1.8m – 2.4m	8W – 16W	High data rate, tight SLA
Video contribution uplink	2.4m+	16W – 25W	HD/UHD broadcast
GCC region (low rain fade)	1.2m	2W	Typically sufficient for managed VSAT
Tropical climate (same link)	1.2m	4W – 8W	Additional rain fade margin required
C-band (large antenna)	2.4m – 3.7m	2W – 5W	Lower free-space loss, rain-fade immune
Ka-band (spot beam)	0.75m – 1.2m	1W – 2W	High satellite EIRP compensates

Don’t Overspec “For Headroom”

Common mistake: Specifying a 10W BUC on a 1.2m dish “just to be safe.” The dish is the limiting factor — a 1.2m antenna at Ku-band has a gain ceiling of ~43 dBi regardless of the BUC attached. Extra watts don’t compensate for inadequate aperture. If you need more EIRP, step up the antenna size before stepping up the BUC power — it’s almost always cheaper and more efficient.

The legitimate exception: a higher-power BUC on an existing installation can buy you additional rain fade margin or support a higher data rate without changing the dish. This is a valid upgrade path when the antenna is already correctly sized for the baseline link.

Always Specify PLL — Not DRO

Independent of output power, always specify a PLL BUC for professional VSAT. A PLL (Phase-Locked Loop) BUC locks its local oscillator to a stable crystal reference (±0.5–1 ppm), ensuring the uplink carrier stays on frequency across temperature changes.

DRO BUCs drift with temperature — acceptable for broadcast receive-only monitoring terminals, not for bidirectional VSAT links where the hub modem requires precise frequency accuracy.

For a full explanation of BUC specifications, see the BUC vs LNB guide.

Frequently Asked Questions

Is a 1W BUC enough for a VSAT installation in the UAE?

For a 1.2m Ku-band antenna on a standard managed VSAT plan in the GCC, 1W–2W is generally sufficient given the low rain fade environment. Confirm with your service provider’s link budget — they specify the minimum EIRP, and you can work backwards to the BUC power needed for your antenna size.

What’s the practical difference between 1W and 2W?

3 dB — which matters. A 2W BUC doubles your transmit power, giving 3 dB more uplink margin. That’s the difference between a link that holds through a rain event and one that drops. For a modest cost increase, the 2W unit is usually the better baseline for any outdoor installation.

Can I upgrade BUC power without changing the dish?

Yes. BUC upgrades are straightforward as long as the new unit is compatible with your feed/waveguide interface and the DC power supply can support the higher draw. A 4W BUC typically draws 40–50W DC vs ~15W for a 1W unit. Verify your IFL and power injector can handle it.

My link drops in rain — will a higher-power BUC fix it?

Likely yes, if rain fade is confirmed as the cause. A BUC upgrade from 1W to 4W adds ~6 dB of uplink margin and typically resolves moderate Ku-band rain fade in the GCC. Also check IFL cable and connector condition first — degraded cable can silently lose 3–5 dB before it shows visible damage.

Does BUC power affect download speed?

No. The BUC only affects the uplink (transmit) path. Download speed is determined by the satellite’s downlink EIRP, your antenna receive gain, and your LNB noise figure — none of which are changed by the BUC. If downloads are slow but the uplink is fine, the BUC is not the issue.

Shop BUCs at Bravo Satcom

Bravo Satcom supplies a full range of Ku-band and C-band BUCs from 1W to 25W — including Terrasat, NJRC, Actox, and Agilis. All units stocked for delivery across the UAE and GCC.

For NJRC BUCs — one of the most widely deployed PLL BUC brands in the MENA region — contact us for datasheets, pricing, and availability.

Not sure which BUC power suits your link? Send us your antenna size, satellite, and data rate requirement and we’ll run the numbers. Reach us at sales@bravosatcom.com or +971 55 541 5892.

Uncategorized

Fiber Optic vs Coaxial Cable: When to Use Each

Posted on July 4, 2026July 4, 2026 by admin

Every RF and satellite engineer hits this fork eventually: you’re designing a cable run and someone asks, “should we go fiber?” The right answer depends almost entirely on what the cable is carrying. If it’s connecting a modem to a BUC or LNB, the answer is always coaxial — no exceptions. If it’s a data backbone between buildings, fiber is almost certainly the better call.

This guide breaks down the key differences between fiber optic and coaxial cable and gives you a clear framework for choosing the right one every time.

Fig 1. Cable cross-section comparison: coaxial (LMR-400) vs single-mode fiber optic (SMF OS2). The critical difference for VSAT installations — coaxial cable carries DC power to the BUC and LNB alongside the RF signal; fiber cannot.

What Is Coaxial Cable?

Coaxial cable carries RF signals as electrical waves along a center copper conductor, insulated from a surrounding braid or foil shield by a dielectric foam core. The shield keeps the signal contained and blocks external interference from entering. An outer PE or PVC jacket provides mechanical and weather protection.

In VSAT and satellite applications the most common types are LMR-400 (standard Ku-band IFL, runs to ~30m), LMR-600 (medium runs to ~60m), LMR-900 (long runs to 80m+), and legacy RG214. For broadcast and CATV distribution, 75Ω RG6 is common.

What Is Fiber Optic Cable?

Two main types exist: single-mode fiber (SMF, OS1/OS2) for long-distance runs up to 40+ km, and multi-mode fiber (MMF, OM3/OM4) for shorter data links up to ~300m. For telecom and data center backbone, SMF OS2 is the current standard.

The defining advantages: attenuation of just 0.2 dB/km at 1550 nm (vs approximately 30 dB/100m for LMR-400 at Ku-band), complete immunity to electromagnetic interference, and effectively unlimited bandwidth. The defining limitation: fiber cannot carry DC power. Any powered equipment at the far end requires a separate power cable.

Fiber Optic vs Coaxial Cable: Full Comparison

Feature	Coaxial Cable (LMR-400)	Fiber Optic (SMF OS2)
Signal medium	Electrical (RF waves)	Light (photons)
Attenuation @ 1 GHz	6.8 dB / 100m	0.035 dB / 100m
Attenuation @ Ku-band (12 GHz)	~30 dB / 100m	N/A — light, not RF
Max practical IFL run (Ku-band)	30m (LMR-400) · 60m (LMR-600) · 80m (LMR-900)	Not suitable for IFL
Max data run	~50m (10GBaseT, Cat6A)	40+ km (SMF)
EMI immunity	Partial (braid reduces, does not eliminate)	Complete — immune to all EMI
DC power over cable	✓ Yes — LNB 13/18V, BUC 24–48V	✗ No — separate power cable required
RF signal (native)	✓ Yes	✗ No — requires RF-to-optical conversion
Bandwidth	DC to 40 GHz (LMR-600)	Practically unlimited (>100 THz)
Field termination	Easy — crimp tool, N-type / SMA / BNC	Requires fusion splicer + cleaver
Cable cost	Lower	Higher
Weight	Heavier	Very light
Minimum bend radius	25mm (LMR-400)	30mm (standard OS2)
Security	Can be passively tapped	Tap causes detectable signal loss
Ground loop / surge risk	Yes — copper conductor	None — glass is non-conductive

When to Use Coaxial Cable

✓ Coaxial is the right choice for:

1. VSAT and satellite IFL runs — Mandatory. Your satellite modem must deliver DC power to the LNB (13V/18V + 22 kHz polarisation tone) and BUC (24–48V) through the same cable that carries the IF signal. Use LMR-400 up to 30m, LMR-600 to 60m, LMR-900 to 80m+ at Ku-band.

2. Two-way radio and base station antenna feedlines — VHF/UHF antenna connections are always coaxial. LMR-400 is the standard for fixed base station installations.

3. RF signal distribution — Splitters, combiners, amplifiers, RF patch panels: anywhere you’re routing or processing a live RF signal, coaxial connections are required throughout the chain.

4. Short runs under 40–50 meters — For L-band and below, coax is simpler, cheaper, and easier to terminate. The attenuation penalty is manageable for short runs.

5. Remote RF power delivery — Any equipment at the far end that needs power over the cable (BUC on a tower, LNB on a dish) requires coaxial IFL — there is no alternative.

6. Field installations — Coax connectors (N-type, SMA, TNC, BNC) are field-terminable with a hex crimp tool. Fusion splicing fiber requires capital equipment and a clean environment.

When to Use Fiber Optic Cable

✓ Fiber optic is the right choice for:

1. Long data backbone runs (>100m) — Any Ethernet or network backbone link over 100m should be fiber. SMF supports 10G Ethernet over 10+ km without amplifiers. Coaxial cable would require impractically thick gauge (LMR-900+) and still fall short.

2. EMI-heavy environments — Generator rooms, industrial motor drives, high-voltage transformer enclosures: fiber is completely immune. Coax braid reduces EMI pickup but does not eliminate it — you’ll see interference on the signal.

3. Building-to-building links — Outdoor aerial or buried runs between buildings: fiber provides natural ground-loop isolation and is immune to lightning surges between structures. Copper cable between buildings can conduct a surge that damages equipment at both ends.

4. High-bandwidth data (40G / 100G / 400G) — These speeds are not achievable over coaxial cable at practical distances. Fiber is the only option.

5. Security-critical installations — Fiber signals cannot be intercepted passively. Any physical tap causes a measurable signal loss that optical monitoring equipment can detect and alert on.

6. Harsh or marine environments — Fiber is immune to moisture ingress effects on signal quality, salt air corrosion of conductors, and temperature-driven changes in impedance.

Why VSAT Always Uses Coaxial — Without Exception

In any VSAT installation — from a single maritime terminal to a large teleport earth station — the IFL between the satellite modem and the outdoor unit (BUC and LNB) must be coaxial cable. The reason is simple: the satellite modem or ODU controller delivers DC power to the LNB and BUC through the same coaxial IFL that carries the IF signal. Fiber optic cable cannot carry DC power.

Fiber-based IF extension systems do exist. They use optical modulators and demodulators with separate power injectors to extend IFL runs beyond 100 meters in large earth station facilities. But these are expensive, complex installations reserved for sites where very long cable runs make standard coax impractical. For any typical VSAT site — from a rooftop dish to a teleport hub — coaxial cable (LMR-400 through LMR-900 depending on run length) is the only practical and cost-effective IFL solution.

Frequently Asked Questions

Can I replace my VSAT coaxial IFL with fiber optic cable?

Not without additional equipment. The BUC and LNB require DC power that can only be delivered over coaxial cable in a standard installation. Fiber-based IF extension systems exist for very long runs (>100m) in large facilities — they use optical modulators with separate power injectors — but they are expensive and complex. For any typical VSAT installation, coaxial cable is the correct and only practical IFL choice.

Which has less signal loss — fiber optic or coaxial?

Fiber wins dramatically. LMR-400 loses approximately 30 dB per 100 meters at Ku-band (12 GHz). Single-mode fiber OS2 loses just 0.2 dB per kilometer at 1550 nm — roughly 15,000 times less attenuation per meter. For data signals over any meaningful distance, fiber is the clear choice.

Is fiber optic cable more expensive than coaxial?

Fiber cable typically costs more per meter, and termination requires a fusion splicer — significant capital equipment. However, for long runs where you’d otherwise need thick-gauge LMR-900 coax plus inline amplifiers, fiber can become cost-competitive overall. For short RF applications under 50 meters, coaxial cable is almost always the lower-cost total solution.

Can fiber optic cable be used as an antenna feedline?

No — not without conversion equipment. Fiber carries digitised optical signals, not analog RF. An antenna feedline must be coaxial to carry the raw RF signal between the antenna and the radio or satellite modem. Any fiber in an RF path requires RF-to-optical conversion at both ends, which adds cost and complexity that makes it impractical for standard installations.

What coaxial cable should I use for Ku-band VSAT IFL runs?

Use LMR-400 for IFL runs up to 30 meters at Ku-band, LMR-600 for 30–60 meters, and LMR-900 for runs beyond 60 meters. All outdoor sections should use weatherproof N-type connectors with proper weatherproofing tape. Never use RG6 or RG58 for VSAT — their attenuation at Ku-band is far too high even for short runs.

Need coaxial cable for your VSAT or satellite installation?
BravoSatcom stocks LMR-400, LMR-600, RG214 — weatherproof N-type connectors included.
We ship across the GCC.

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VSAT

C-Band in VSAT Technology

Posted on March 26, 2023March 27, 2023 by

C-band is one of the oldest and most widely used frequency bands in satellite communication. It operates in the 4 to 8 GHz frequency range and has a wavelength of around 4 to 8 centimeters. The lower frequency range of C-band provides better penetration through obstacles such as rain, fog, and foliage, making it ideal for long-distance communication in areas with harsh weather conditions.

In VSAT technology, C-band is often used for applications that require long-distance communication, such as maritime and aviation. It is also used for remote sensing, meteorological observation, and broadcasting.

One of the advantages of C-band over other frequency bands is its wider coverage area. Due to its lower frequency range, C-band signals can be transmitted over longer distances, which means that fewer VSAT terminals are required to cover a large area. This makes C-band ideal for applications that require wide-area coverage, such as disaster relief, rural connectivity, and military communication.

Another advantage of C-band is its lower susceptibility to rain fade compared to Ku-band and Ka-band. Rain fade occurs when raindrops absorb and scatter the radio waves transmitted between the VSAT terminal and the satellite, which can affect the quality of the signal. Due to its lower frequency range, C-band signals are less affected by rain fade than Ku-band and Ka-band signals, making it more reliable in areas with frequent rainfall.

However, C-band has some disadvantages compared to Ku-band and Ka-band. One of the main disadvantages is its lower bandwidth capacity. Due to its lower frequency range, C-band has a lower bandwidth capacity than Ku-band and Ka-band, which means that it can transmit data at a slower rate. This makes C-band less suitable for applications that require high-speed data transfer, such as video streaming and cloud computing.

In addition, C-band has a higher susceptibility to interference from terrestrial microwave communication and radar systems. This is because the frequency range used for C-band overlaps with the frequency range used for some terrestrial communication systems. To mitigate this interference, VSAT terminals using C-band must comply with regulatory requirements and use interference-reducing technologies such as frequency hopping.

In summary, C-band is one of the oldest and most widely used frequency bands in satellite communication, and it is often used for applications that require long-distance communication in areas with harsh weather conditions. It has a wider coverage area than Ku-band and is less susceptible to rain fade, making it more reliable in certain environments. However, it has a lower bandwidth capacity than Ku-band and Ka-band and is more susceptible to interference from terrestrial communication systems.

VSAT

Is VSAT Still Relevant Today Now That Starlink Is Out?

Posted on March 22, 2023March 22, 2023 by

Yes, VSAT (Very Small Aperture Terminal) is still relevant today even with the emergence of Starlink and other satellite broadband services. While Starlink offers high-speed internet service using low-earth orbit (LEO) satellites, VSAT technology operates using geostationary satellites, which are placed at a much higher orbit.

VSAT technology has been around for decades and is used for a wide range of applications, including remote communication, distance learning, and disaster response. VSAT can be an effective solution for businesses, organizations, and individuals who require reliable and secure satellite connectivity in remote or underserved areas where traditional wired and wireless internet services are not available.

Additionally, VSAT can be more cost-effective for some use cases, particularly for small and medium-sized businesses or individuals who require moderate bandwidth usage. VSAT can also offer more stable connectivity and lower latency than satellite services that use LEO satellites like Starlink, which may be affected by atmospheric conditions and require line-of-sight access to the satellite.

Overall, while Starlink and other LEO satellite broadband services are exciting developments in the satellite internet industry, VSAT remains a relevant and important technology for many applications and use cases.

What Is LMR-400?

Construction: What’s Inside Each Cable

Centre Conductor

Dielectric

Outer Conductor (Shield)

Outer Jacket

Attenuation: Specified vs Observed

Connector Fit and Termination

Key Specifications Side-by-Side

Where the Difference Is Most Noticeable

Frequently Asked Questions

What Is Cable Attenuation?

How Attenuation Is Measured and Specified

Why Frequency Makes Attenuation Worse

Cable Attenuation Comparison: LMR Series vs Legacy Coax

Attenuation and VSAT IFL Runs: Real-World Limits

The Other Sources of Signal Loss: Don’t Forget Connectors

How to Reduce Cable Attenuation

Frequently Asked Questions

What Is Coaxial Cable?

What Is Fiber Optic Cable?

Signal Attenuation: The Numbers That Decide Everything

Fiber Optic vs Coaxial: Full Comparison

When to Use Coaxial Cable

✓ Coaxial is the right choice for:

When to Use Fiber Optic Cable

✓ Fiber optic is the right choice for:

Why VSAT Always Uses Coaxial — Without Exception

Frequently Asked Questions

The 2020–2021 merger: what changed for buyers

The three platforms explained

Dialog (formerly Newtec)

Evolution (legacy iDirect)

Velocity (iDirect HTS/mobility)

Modem-by-modem comparison

How to choose: a decision guide

UAE and GCC considerations

Frequently asked questions

Are Newtec and iDirect the same company?

Can iDirect Evolution modems work on a Newtec Dialog network?

Which modem is better for a UAE small-office VSAT?

What replaces the iDirect X7?

Where can I buy Newtec or iDirect modems in Dubai?

Is MDM2510 still in production in 2026?

Bottom line

What You’ll Need

Strip Dimensions for LMR-400 N-Type Crimp

Step-by-Step: N-Type Crimp on LMR-400

Common Mistakes

Testing Your Termination

Connector Compatibility Quick Reference

FAQ

Need LMR Cables and Connectors?

What BUC Output Power Actually Does

Factor 1: Antenna Size

Factor 2: Frequency Band

Factor 3: Rain Fade Margin

Factor 4: Satellite G/T

Factor 5: Data Rate and Modulation

BUC Power Quick-Selection Guide

Don’t Overspec “For Headroom”

Always Specify PLL — Not DRO

Frequently Asked Questions

Is a 1W BUC enough for a VSAT installation in the UAE?

What’s the practical difference between 1W and 2W?

Can I upgrade BUC power without changing the dish?

My link drops in rain — will a higher-power BUC fix it?

Does BUC power affect download speed?

Shop BUCs at Bravo Satcom

What Is Coaxial Cable?

What Is Fiber Optic Cable?

Fiber Optic vs Coaxial Cable: Full Comparison

When to Use Coaxial Cable

✓ Coaxial is the right choice for:

When to Use Fiber Optic Cable

✓ Fiber optic is the right choice for:

Why VSAT Always Uses Coaxial — Without Exception

Frequently Asked Questions

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