Common Mode Coax Noise Filter - 1500 Watts, 20-160 MHz
CMNF-1500VHF for transmitter/receiver coax lines up to 1500 watts PEP from 20-160 MHz
For coax lines with receive and transmit signals, we suggest the CMNF series with SO-239 connectors in and out which are connected in series with the coax feed line to the receiver/transceiver/amplifier effectively reducing common mode noise existing on the coax.
ALL antenna feed lines entering the radio room need to have a feed line choke particularly if they all feed a common coax switch. Choking only 1 line if you have 5 antenna coax feeds will do little good – you need to choke all five – use the feed line chokes for the individual feed lines and the CMNF between the antenna coax switch and the receiver. All CMNF models are SO-239 input and output. Adapters are available for converting to “F”, or “N” connectors.
Installation Note: Putting a CMNF at the output of your antenna tuner lessens the choking effectiveness since the impedance may be much higher or lower than the 50 ohm design impedance of the noise filter. The best place to install the CMNF is between the antenna tuner/linear or closest to the receiver/transceiver
Enclosure is 4" x 4" x2" PVC weather resistant.