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Palomar Engineers CMNF-1500HF
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Palomar Engineers CMNF-1500HF

Coax Common Mode Noise Filter - 1500 Watts 1.8-60 MHz -38 dB Common Mode Noise Suppression

HRO Discount Price: $89.95*


*After Coupons & Promotions.

Current Stock Status At These Ham Radio Outlet Locations
CMNF-1500HF Description     Hide

Product Details:

  • 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

CMNF-1500HF for transmitter/receiver coax lines up to 1500 watts PEP - 1.8-60 MHz, -38 dB Common Mode Suppression

  • 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 20-38 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-500-50 (500 watts PEP) placed between the receiver and the amplifier.

    Manufacturer's Website

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