South Midlands Communications Group

HFM2-20 - 2 x 20 kW HF Transmitter Multicouplers

Transmitter multicouplers utilising low loss filter networks enable multiple transmitters to work into a common antenna. Computer aided design techniques provide optimum performance from passive LC circuits which allows transmitters to work at 15% frequency separation.

System losses are low, typically less than 0.2 dB and rejection of the adjacent transmitter greater than 30 dB.

Frequency: 0.1 - 32MHz
Impedance: 50 ohms
VSWR: <1.2: 1 (matched loads)
Insertion Loss: <0.3dB (matched load)
Isolation: >30dB (matched load)
Load VSWR: 3:1 max
Weight: 325kg approx
Notch Width: 15%, 20%, 40% of cross over frequency
Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available) 
Environment: Outdoor unprotected -40ºC to +55ºC. Silicone oil cooled natural convection
Connectors: 3 1/8" EIA
Power: 2 input channels each 20 kW average (80kW peak)
1 output channel 40 kW average (160kW peak)


Typical response

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