25:1 to 81:1 Baluns/Ununs

These baluns and ununs can be used for impedance matching and also as End Fed halfwave antenna matching transformers to 50 or 75 ohm coax cable.

Coax Common Mode Noise Filter - 1500/5000 Watts, 100 KHz to 30 MHz, up to -38 dB Common Mode Noise Suppression!

SKU CMNF-1500LF
$109.95
Bulk pricing available for quantities of 2 units or more
Power Level
1
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Coax Common Mode Noise Filter - 1500/5000 Watts, 100 KHz to 30 MHz, up to -38 dB Common Mode Noise Suppression!
Product Details
MPN: CMNF-1500HF
Type: NEW
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-1500LF for transmitter/receiver coax lines up to 1500 watts PEP - 100 KHz - 12 MHz, Up to -38 dB Common Mode Noise 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 200 KHz to 7 MHz

- Common mode noise rejection up to 20-36 DB (3-6 "S" units) depending on frequency

- Simple plug & play installation: plug a short jumper from the CMNF-1500LF to your amplifier output and plug the feed line (or a jumper to your antenna tuner) into the other SO-239 CMNF-1500LF 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 .2-7 MHz range, place the CMNF-1500LF in the "common" line of the antenna coax switch and the antenna tuner/amplifier.

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

Palomar Engineers Common Mode Noise on Coax User Diagnosis Test