For coax feed lines with receive and transmit signals, you will love the small size, wide frequency range and excellent attenuation of common mode noise interference emphasizing low frequency range of 100 KHz to 10 MHz but working well up to 30 MHz.

- Reduces broadband common mode receiver noise* picked up on the outside of the antenna coax feed line.

- Low frequency range works on all brands of radios and coax fed antennas

- Common mode noise rejection up to -46 DB (3-8 "S" units) depending on frequency

- Simple plug & play installation: plug a short jumper from the CMNF-500-50LF to your radio and plug the feed line into the other SO-239 CMNF-500-50LF input. Either connector can be input or output. Rated at 500 watts PEP, 50 ohm input/output

- will work with Bias-T antenna switches and will pass DC voltage from input to output with no attenuation

* not effective for noise from AC power lines or noise received directly by antenna

Installation Note: For best results, and to reduce co-interference between choked and unchoked coax feed lines with multiple antennas, ALL antenna feed lines entering the radio room need to have a separate feed line choke particularly if they are at a different frequency then HF, like VHF or UHF.

If you use a antenna switch for multiple antennas in the 1-61 MHz range, place the CMNF-500-50LF in the "common" line of the antenna coax switch and the receiver or for better isolation, place one filter in each antenna line to isolate the multiple coax braids from one another..

Got Common Mode Noise? Not Sure - Find out now by clicking link below:

Palomar Engineers Common Mode Noise on Coax User Diagnosis Test

If you use a higher powered transceiver over 500 watts PEP or use an amplifier, consider the CMNF-1500HF (1.5KW PEP) or CMNF-5000HF (5KW PEP) placed at the output of the amplifier.

See related products for coax jumpers or double male barrel connector for direct connection to radio.