Coax Common Mode Noise Filter - 1500/5000 Watts, 100 KHz to 30 MHz, up to -38 dB Common Mode Noise Suppression!Product DetailsMPN: CMNF-1500HFType: NEWCountry/Region of Manufacture: United StatesFilter Power Rating (PEP watts): 1500Choking Impedance (ohms): 1000-6500Common Mode Attenuation (db): 21-36 dbRFI Suppression Range (MHz): 1.8-60Insertion Loss (db): .05# Ferrite Filters: 5Enclosure Size (inches): 4" x 4" x 2"Typical Use:: Noise filter at radio end of coax between amplifier and antenna tunerCMNF-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
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:
Christmas lights or yard lights with switching DC power supplies are often the RFI source and a clamp on ferrite bead on the AC AND the DC side feeding the lights is needed to help suppress the switching power supply RFI noise. Suitable snap on beads are FSB31-1/2 for the 1-250 MHz range.
We have also had reported wireless HDTV boxes, and FOSCAM and AMCREST security camera systems causing RFI to garage door remote openers. Use our Garage Door Opener RFI kit to suppress the interference to the opener (VICTIM) – you need one kit for each opener. Maximize the distance from the camera to the openers may also help. Additionally shield cable to the garage door sensors may be needed depending on severity of the camera RFI.
Obvious Tech Note: make sure your remote batteries have enough energy to activate the GDO or the signal they transmit may not be large enough to over ride the RFI signal, but a fresh battery may be able to overcome the weak RFI source and allow the GDO to operate correctly.