In response to several requests from both MW DXâers and 160 Meter enthusiasts, MyAntenna.com has added a new receive-only common-mode choke to their line of impressive products. This common mode choke can be inserted anywhere in the feed line to your BOG, active whip, loop, etc. The choke blocks unwanted noise that is often picked up by the coax as it travels from the antenna back to your shack.
Many manufacturers claim that their chokes will work over impossible bandwidth of frequencies, which simply isnât possible. In contrast, these chokes are designed to work over a limited range of frequencies. In this case itâs 500 KHz to 10 MHz.
Common-mode attenuation: ~37dB
Choking Impedance >5,000 Ohms
The choke will allow DC power to pass through to active antennas, and can be inserted anywhere in the feed line, including inside the shack. For best results, itâs recommended that the choke be installed about 20 feet from the antenna. I have no financial relationship with the company, but am a satisfied customer.
http://myantennas.com/wp/product/cmc-0510-r/
If you have EMI/RFI problems or just want to reduce the noise floor to your receiver, you canât go wrong by installing good quality common-mode chokes in your system.
73,
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL
EM63nf
Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA.
Elad FDM-S2 SDR, AirSpy SDR, Quantum Phaser, Wellbrook ALA1530 Loop, Wellbrook Flag, Clifton Labs Active Whip.
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