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

Name: Coax Common Mode Noise Filter - 1500 Watts, 1.8-60 MHz, -38 dB Common Mode Noise Suppression
SKU: CMNF-1500HF
Price: 89.95 USD
Availability: InStock

CMNF-1500HF

$89.95

In stock

Quantity:

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-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-500HF (500 watts PEP) placed between the receiver and the amplifier.

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

Palomar Engineers Common Mode Noise on Coax User Diagnosis Test

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

Save this product for later

Portable operation is fun but also brings challenges to the radio operator concerning receiver “noise” levels, RF interference from adjacent sources including close by transmitting stations, and RFI from portable generators. A typical scenario and some suggested Palomar product solutions are shown in the picture below:

Generator RFI testimonial:

Bob 

Received your order in a timely fashion. Tried the generator kit on Sunday & it drops the noise from S9 to S5 and 
took out all the electrical noise.  I may want some more toroids from you at some point for other interference problems
I have  here.
Ken VE3KCY

Using an amplifier? Don’t forget our Linear Amplifier RFI Kits

Want to make up your own RFI kits for a particular operation? Here are links to some of typical RFI solutions used in portable operations:

AC/DC common mode filters

Feed Line chokes

Coax Noise Filters

If you use a computer for logging in your portable operations, RFI getting into computers will often lock up your computer and/or radio and a computer RFI suppression kits may be helpful

Computer RFI Kits

Make your expedition or portable operation a pleasant and fun outing and remember to take along your RFI kits so you have more time to operate rather then to troubleshoot intermittent or noisy receiver conditions.

Portable Antenna Kits

If you need an effective portable antenna which folds up for transport yet is easy to deploy at your operating site, consider the BULLET series of end fed wire antennas.

BULLET Antennas (click on link or picture for more info)