Common Mode Noise Filter – Coax

Coax Common Mode Noise Filter - 1500 Watts, 1.8-60 MHz


Coax Common Mode Noise Filter - 1500 Watts, 1.8-60 MHz CMNF-1500HF

CMNF-1500HF for transmitter/receiver coax lines up to 500 watts PEP - 1.8-60 MHz!

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

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

- Wide frequency range works on all brands of radios and coax fed antennas from 1.8-60 MHz

- Common mode noise rejection up to 21-36 DB (3-6 "S" units) depending on frequency

- Simple plug & play installation: plug a short jumper from the CMNF-1500HF to your amplifier output and plug the feed line (or a jumper to your antenna tuner) into the other SO-239 CMNF-1500HF input. Either connector can be input or output. Rated at 1500 watts PEP.

- 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 1.8-61 MHz range, place the CMNF-1500HF in the "common" line of the antenna coax switch and the antenna tuner/amplifier.

For additional common mode noise reduction, consider the CMNF-500HF (500 watts PEP) placed between the receiver and the amplifier.

This product was formally named CMNF-2 prior to October 31, 2017

$79.95 In stock
UPC:Does not apply
Brand:Palomar Engineers
Country/Region of Manufacture:United States
Filter Power Rating (PEP watts):1500
Choking Impedance (ohms):1000-6500
Common Mode Attenuation (db):21-36 db
RFI Suppression Range (MHz):1.8-60
Insertion Loss (db):.05
# Ferrite Filters:5
Enclosure Size (inches):4" x 4" x 2"
Typical Use::Noise filter at radio end of coax between amplifier and antenna tuner
Coax Common Mode Noise Filter - 1500 Watts, 1.8-60 MHzCoax Common Mode Noise Filter - 1500 Watts, 1.8-60 MHz


Typical user comment:

The filter was quite effective. Was surprised that it actually reduced the noise level
more than the signal so S+N/N improved by 1.9 S units.