Professional High-Power RF Signal Splitting and Isolation Infrastructure
The Avair AV-21C is a commercial-grade, high-performance radio frequency duplexer engineered to combine or separate signal streams across dual target frequency windows: 1.6 to 225 MHz (HF/VHF spectrum) and 350 to 540 MHz (UHF spectrum). This premium splitter/combiner network allows operators to route multi-band transceivers into dedicated single-band antennas, or feed multiple base stations into a single transmission line without cross-talk or physical hardware modification. It stands as a critical utility asset for maritime communication hubs, emergency response dispatch stations, corporate fleet control rooms, and specialized B2B radio accessory distribution networks across Europe.
The advanced technical architecture features an internal low-loss filter network built to handle substantial peak load capacities across diverse bands, enabling high-power deployments up to 1 kW (PEP) on low HF channels (1.6–30 MHz), 250 W (PEP) across VHF frequencies (49–225 MHz), and 200 W (PEP) down the UHF block (350–540 MHz). To protect sensitive multi-receiver setups from close-in harmonic interference and transmitter overload, the solid shield casing provides a strict cross-band isolation rating of greater than 50 dB. Operating at a precisely tuned characteristic impedance of 50 Ohms, this heavy-duty 300 g accessory delivers minimal insertion loss, safeguarding the RF power amplifier modules of connected transceivers from damage caused by standing wave mismatches.
To support high-frequency efficiency and diverse terminal hookups, the duplexer incorporates an integrated dual-cable pigtail layout terminated with specialized mechanical connector standards. The common port features a rugged, chassis-mounted SO-239 (UHF-Female) socket, while the low-pass and high-pass cable leads branch out into precision-machined PL-259 (UHF-Male) and high-frequency N-Male connectors. These heavy-duty threaded coupling rings guarantee a flush, vibration-proof electrical bond that eliminates signal degradation, ensuring absolute operational fleet readiness in harsh fixed or vehicular installation environments.
Verified Technical Specifications Matrix
| Technical Specification Parameter | Manufacturer Value |
|---|---|
| Product Brand Manufacturer | Avair |
| Hardware Model Designation | AV-21C |
| Primary Component Classification | RF Coaxial Duplexer / Frequency Combiner-Splitter |
| Passband Frequency Ranges | Port A: 1.6 – 225 MHz | Port B: 350 – 540 MHz |
| Peak Transmit Load Capacities | 1.6-30 MHz: 1 kW (PEP) | 49-225 MHz: 250 W (PEP) | 350-540 MHz: 200 W (PEP) |
| Cross-Band Port Isolation | > 50 dB Minimum Suppression |
| System Characteristic Impedance | 50 Ohms Nominal Calibration |
| Interface Connector Standard | Chassis: SO-239 (UHF Female) | Leads: PL-259 (UHF Male) & N-Male Matrix |
| Net Hardware Component Weight | 300 grams |
