CB Radio Generic Mobile Transceiver RFI/Noise Reduction Kit, RFI Range: 20-60 MHz, Works on all brandsProduct DetailsMPN: RFI-CB-MOBILECountry/Region of Manufacture: United StatesFilter Power Rating (PEP watts): 500Common Mode Attenuation (db): <=25 dBRFI Suppression Range (MHz): 20-60 MHz# Ferrite Filters: 2Palomar Engineers RFI Filter Kit for CB Radio Radio Transceivers from 20-30 MHz uses ferrite rings for the DC power supply and the coax to the antenna.
BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI NEEDS! WORKS WITH ALL BRANDS (Cobra, DAS, Midland, Uniden etc.) OF CB/HAM/COMMERCIAL RADIO RIGS in 20-60 MHz range.
Purpose
The RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the outside of the coax braid at the output of your radio and on the DC power supply cable.
This kit will help reduce or eliminate:
1. “Hot mic” RFI caused by poor grounding of antennas or common mode currents from linear amps feeding unbalanced (coax fed) antennas without baluns/line isolators.
2. RFI to neighbor’s electronic devices including audio/video systems, computers, telephones, garage door openers, etc.
3. RFI to your other radios, audio/video systems, computers, telephones, etc.
A side benefit is a reduction in noise floor in your receiver depending on the amount of noise being introduced by common mode currents (which are blocked/reduced by the chokes in this kit).
These chokes use a special mix of ferrite core material that is effective in suppressing radio frequency interference from Ham Radio amplifiers.
Included are the following chokes and installation guidelines:
DC Input: F240 Ring – 3-7 turns of DC power cable - sized for smaller plugs
RF Input/Output: F240-31 ring - wrap 6 turns of RG8X size cable near the back of the radio
Also make sure you connect a good RF ground to the transceiver ground post.
For additional RFI suppression, use a MC-1-500-50 mini feed line choke at the antenna feed point to suppress common current on the coax feed line during transmit and a CMNF-500-50 Coax Noise Filter to reduce common mode noise during receive operations.
If you use a switching power supply for base operation, consider the RFI-SMPS switching power supply RFI kit.
If you use a linear amplifier we have RFI kits for linear amplifiers that help suppress RFI in your shack or in your neighbor’s house.
HF 1-61 MHz coax feed line common mode chokes
Palomar Engineers RFI Filter Kit for CB Radio Radio Transceivers from 20-30 MHz uses ferrite rings for the DC power supply and the coax to the antenna.
BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI NEEDS! WORKS WITH ALL BRANDS (Cobra, DAS, Midland, Uniden etc.) OF CB/HAM/COMMERCIAL RADIO RIGS in 20-60 MHz range.
Purpose
The RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the outside of the coax braid at the output of your radio and on the DC power supply cable.
This kit will help reduce or eliminate:
1. “Hot mic” RFI caused by poor grounding of antennas or common mode currents from linear amps feeding unbalanced (coax fed) antennas without baluns/line isolators.
2. RFI to neighbor’s electronic devices including audio/video systems, computers, telephones, garage door openers, etc.
3. RFI to your other radios, audio/video systems, computers, telephones, etc.
A side benefit is a reduction in noise floor in your receiver depending on the amount of noise being introduced by common mode currents (which are blocked/reduced by the chokes in this kit).
These chokes use a special mix of ferrite core material that is effective in suppressing radio frequency interference from Ham Radio amplifiers.
Included are the following chokes and installation guidelines:
DC Input: F240 Ring – 3-7 turns of DC power cable - sized for smaller plugs
RF Input/Output: F240-31 ring - wrap 6 turns of RG8X size cable near the back of the radio
For additional RFI suppression, use a MC-1-500-50 mini feed line choke at the antenna feed point to suppress common current on the coax feed line during transmit and a CMNF-500-50 Coax Noise Filter to reduce common mode noise during receive operations.
If you use a switching power supply for base operation, consider the RFI-SMPS switching power supply RFI kit.
If you use a linear amplifier we have RFI kits for linear amplifiers that help suppress RFI in your shack or in your neighbor’s house.
1:1 feed line Chokes (also known as feed line current chokes, common mode chokes, line isolators, current mode chokes, and 1:1 baluns/ununs) are available in kit form or assembled form in a weatherproof Current Unun and Balun Enclosure which we call a CUBE™. All 1:1 chokes are ferrite based and are designed for 50 ohm coaxial cable input and 50 ohm output. 1:1 Ferrite toroidal or bead chokes have a higher choking impedance than our popular Sleeve Chokes and various models are available for specific frequency ranges and power levels.
1:1 Chokes are useful for choking common mode currents that may flow on the exterior of the coax cable shield while allowing the signals on the interior of the shield and the center conductor to flow unaffected and keeping the common mode current on the antenna. They isolate the coax shield and prevent it from becoming part of the antenna system.
1:1 Chokes are useful between balanced lines for center fed dipoles at their fundamental frequency (468/f (MHz), beam antennas with a 50 ohm balanced driven element, G5RV, loops, yagis, NVIS antennas, mobile installations, portable antennas and anywhere common mode current (or RFI) is a problem. They are also helpful between transmitter and linear amplifier or between linear amp and antenna tuner or as isolation chokes where higher choking impedance is needed (in the range of 2K-7K ohms).
1:1 Chokes are also very useful as feed line current chokes at the “radio end” of the antenna (we call them coax noise filters) where they choke/filter common mode current induced onto the coax shield from radiated waves (from your antenna, and other sources such as DSL routers, computer devices, plasma TVs, etc. originating in your house or your neighbor’s house). For RFI issues see RFI/EMI Solutions for general use or for specific radios and devices.
For best results we recommend a 1:1 choke at the “antenna end” of the coax and a coax noise filter at the “radio end” of the coax. (A side benefit is a reduction in noise level caused by common mode currents). 1:1 chokes are also available as Sleeve Chokes (Slip on or Snap on) for ease of installation and light weight on the antenna.