4-channel combiner-equalizer of UMT production is active device specially designed to combine 4 independent IF carriers (L-band, frequency range of 950-2150 MHz) with power adjustment and AGC for each channel.
4-channel combiner-equalizer has 4 RF inputs for 4 IF carriers and 1 or 2 independent outputs. All inputs and outputs work in L-band. 1st output contains full spectrum combined from 4 inputs and is used for further signal transmitting. The 2d output is used for signal controlling (can be added by request) and has up to 30 dB lower signal power than the 1st input.
4-channel combiner-equalizer can be used in MVDS head-end, professional TV link and TV repeater stations due to its features such as automatic gain control (AGC) which provides high stability of output RF-signal power. The case of the 4-channel combiner-equalizer is designed for using in standard 19″ rack.
4-Channel Combiner-Equalizer is a professional active RF unit engineered to combine up to four independent L-band carriers (950–2150 MHz) into a single stable and power-equalized output. Each channel features manual power adjustment and AGC, ensuring equalized amplitude regardless of input fluctuations. This provides a clean and stable combined spectrum ideal for MVDS operators, headend stations and repeater sites.
Designed for continuous 24/7 broadcasting, the system supports an optional AUX monitoring port and offers compatibility with both 75-ohm F-type and 50-ohm N-type connectors. Built for rackmount integration in standard 19” systems, it is well suited for IF distribution, MVDS broadcasting, satellite system combining and RF equalization.
✅ Precision multi-channel L-band combining
This device is engineered to combine four independent IF carriers with high amplitude stability and low distortion. Each channel can be individually equalized, providing precise power leveling across the combined output. Such architecture ensures optimal RF chain performance in satellite, MVDS and headend systems where uniform output levels are critical.
✅ Advanced AGC and manual gain control
Every channel includes automatic gain control to stabilize output power even when input levels fluctuate. Combined with wide-range manual attenuation, this provides fine-tuned control for system balancing. These mechanisms allow operators to maintain stable transmission in dense multi-carrier environments.
✅ Broadcast-grade signal integrity
With extremely low intermodulation distortion, high linearity and flat gain response, the combiner-equalizer ensures minimal degradation of modulated carriers. This is especially important for QAM, QPSK and APSK signals used in professional DVB infrastructures. Its optimized group delay performance ensures clean transmission without distortions across the full L-band.
🛠️ This 4-Channel Combiner-Equalizer delivers high linearity, low intermodulation distortion and minimal group delay variation, ensuring excellent signal integrity across the full L-band range. Thanks to advanced AGC, the output remains stable even when input levels vary significantly. The device is optimized for multi-carrier environments that require precise shaping and reliable long-term operation.
🛒 The 4-Channel Combiner-Equalizer is ideal for professional applications such as IF distribution, MVDS broadcasting, satellite system combining and RF equalization. Its stable output, optional monitoring capabilities and professional connector options make it a reliable solution for modern RF infrastructures.
📌 Key features
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Automatic gain control for each channel
AGC stabilizes output levels regardless of input fluctuations, ensuring uniform carrier power during multi-channel combining. This prevents overload conditions and improves overall headend reliability. The feature is crucial in systems with variable amplifier outputs or long RF cable runs.
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High output linearity and low intermodulation distortion
The combiner is engineered for low IMD, ensuring that modulated carriers maintain spectral purity. This improves MER/BER performance in downstream demodulators, reducing signal degradation in MVDS and satellite distribution networks. High linearity also protects the system from unwanted inter-carrier interference.
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Wide adjustment range for each input channel
With a manual attenuation range from –37 to –7 dBm, operators can fine-tune each input precisely. This flexibility supports integration with different transmitters, modulators or IF sources. It allows maintaining ideal balance between carriers for optimal combined output quality.
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Optional AUX monitoring output
A secondary –20 dB output can be used for spectrum analysis or real-time monitoring. This helps engineers verify output stability without disturbing the main signal path. It is ideal for headend diagnostics and automated signal watchdog systems.
⚙️ Main functions
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Combining four independent L-band IF carriers
The system merges four modulated carriers into a single unified output while preserving individual carrier characteristics. This reduces equipment count and simplifies RF distribution infrastructure. It is ideal for building compact IF transport systems.
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Equalization and stabilization of output power
AGC and manual adjustment work together to produce a stable combined output with controlled amplitude. This ensures consistent performance in downstream RF amplifiers, upconverters or transmission equipment. Eliminating level imbalance improves network reliability.
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Protection and 24/7 continuous operation
The device is built for round-the-clock operation with high-reliability components. Stable temperature behavior and electrical protection ensure long-term performance in headend racks. It operates safely even under fluctuating load conditions.
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Rackmount integration for professional systems
Its 1RU design fits standard broadcast racks and is optimized for MVDS, repeater sites and RF combining applications. Front and rear access options simplify installation and maintenance. The compact form factor helps reduce system footprint.
🧩 Applications
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MVDS broadcasting headends
Used to combine several L-band carriers feeding MVDS transmitters. Ensures stable equalized output for long-distance distribution. Helps operators maintain consistent signal quality across coverage zones.
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Professional TV link and repeater stations
Ideal for combining modulated carriers before RF upconversion or retransmission. Its high linearity maintains signal fidelity under multi-carrier load. Suitable for both point-to-point and point-to-multipoint systems.
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Satellite IF distribution and IF processing systems
Supports combining QPSK, QAM and APSK IF carriers for satellite monitoring, redistribution or redundancy paths. Ensures stable and predictable performance for downlink or uplink preparation. AUX output facilitates real-time signal verification.
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Laboratory and RF development environments
Provides controlled combining of multiple carriers for equipment testing. Engineers can measure IMD, power stability and spectrum behavior. Suitable for R&D setups requiring precise multi-carrier synthesis.
💡 Why you should buy from us❓
- 1.5 years warranty
- 7 years after-sales support
- Remote support team of engineers
- Discount program for regular customers 🎁
💬 Contact Us
For additional details or assistance regarding the 4-Channel Combiner-Equalizer, feel free to contact our team. We provide professional consultation and aftersales support to help with installation and setup, ensuring you get the most out of your broadcasting equipment.
