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

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:

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

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.

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:

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.

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:

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.

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.

Don’t Overspec “For Headroom”

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

Ask any VSAT engineer and they’ll tell you: the two components most misunderstood by procurement teams are the BUC and the LNB. Both sit at the antenna, both deal with frequency conversion — but they do opposite jobs, spec differently, and fail in completely different ways. Understanding the BUC vs LNB difference is fundamental to specifying, installing, and troubleshooting any VSAT system correctly.

This guide explains what each component does, the specs that matter, and how they work together in a complete satellite link.

What Is a BUC (Block Up-Converter)?

A BUC — Block Up-Converter — handles the transmit (uplink) side of your VSAT link. It takes the low-frequency IF signal from your modem (typically L-band: 950–1,450 MHz) and up-converts it to the satellite’s transmit frequency — Ku-band (13.75–14.5 GHz), C-band (5.85–6.425 GHz), or Ka-band (27.5–31 GHz) — then amplifies it to a level strong enough to reach the satellite.

In plain terms: your modem talks, the BUC shouts it toward the satellite.

Output power is the primary BUC spec. A 1W BUC is sufficient for many SCPC/TDMA VSAT links with a 1.2m antenna in good conditions. Move to a 4W or 8W BUC when you have longer hop distances, smaller antennas, or need rain fade margin in tropical climates.

What Is an LNB (Low Noise Block Downconverter)?

An LNB — Low Noise Block Downconverter — handles the receive (downlink) side. It captures the extremely weak satellite signal arriving at the antenna (typically −90 to −120 dBm at Ku-band), amplifies it with the least possible added noise, then down-converts it to L-band IF (950–2,150 MHz) for the modem to process.

In plain terms: the LNB listens to the satellite and whispers the signal to your modem.

For VSAT applications, always specify a PLL LNB over a DRO LNB. PLL (Phase-Locked Loop) LNBs have a local oscillator stability of ±1–5 ppm — critical for VSAT modems that use tight carrier spacing. DRO LNBs drift with temperature and cause demodulation errors on professional VSAT links.

BUC vs LNB: Side-by-Side Comparison

How BUC and LNB Work Together

In a typical VSAT installation, the signal flow is:

Transmit: Modem → IF coax → BUC (up-converts and amplifies) → waveguide/feed → reflector → satellite
Receive: Satellite → reflector → feed → LNB (amplifies and down-converts) → IF coax → Modem

The modem supplies DC power to both the BUC and LNB via the IFL coaxial cables. In compact VSAT installations, the BUC and LNB are often integrated into a single ODU (Outdoor Unit) or transceiver — but they remain functionally separate components inside.

Choosing the Right BUC: Output Power Guide

For the GCC and wider MENA region, a 2W–4W BUC on a 1.2m–1.8m Ku-band antenna typically provides adequate margin for local rain fade statistics.

Choosing the Right LNB: What to Look For

Noise figure under 0.5 dB for any professional VSAT application — a 0.3 dB LNB gives meaningful link margin advantage over a 0.7 dB unit.

Always specify PLL for VSAT modems (iDirect, Newtec, UHP, Comtech) — DRO LNBs will cause link instability on any system using tight carrier spacing or high-order modulation (16APSK, 32APSK).

Match the frequency band to your satellite — confirm whether you’re on standard Ku (10.7–12.75 GHz universal) or a specific Ku sub-band that requires a dedicated LO frequency.

Frequently Asked Questions

Can a BUC and LNB share the same cable?

Not without a diplexer. The transmit and receive signals occupy different frequency ranges and the components have different DC power requirements. In some compact VSAT systems a diplexer is built into the ODU housing allowing a single IFL cable — but inside, the signals are always separated.

What fails more often — the BUC or LNB?

The BUC. It’s an active transmit amplifier running at meaningful power levels in outdoor conditions. LNBs are lower-power receive devices and tend to be more reliable, though noise figure degrades slowly over years. If receive C/N has dropped with no other changes, check the LNB first.

Is a BUC the same as an SSPA or TWTA?

Not exactly. A BUC combines an up-converter and an amplifier in one unit. A standalone SSPA (Solid State Power Amplifier) or TWTA (Travelling Wave Tube Amplifier) is a high-power amplifier only — it requires a separate up-converter. BUCs are the standard solution for VSAT; SSPAs and TWTAs are used in larger broadcast and teleport uplinks.

What’s the difference between a PLL and DRO LNB?

PLL (Phase-Locked Loop) uses a stable crystal reference to lock the local oscillator frequency to a precise value (±1–5 ppm). DRO (Dielectric Resonator Oscillator) relies on a temperature-sensitive ceramic resonator and drifts significantly (±100–500 kHz). For VSAT: always PLL. DRO is acceptable only for DTH (direct-to-home) TV reception.

Shop BUCs and LNBs at Bravo Satcom