Thanks Les. I just ordered one of these. I also asked the vendor if they would consider making a similar common-mode choke for 10-500 kHZ.
I have some local noise which is generally only an issue during daytime when signal levels are low. I am pretty sure it is locally generated. The DX Engineering choke I purchased was no help, but it requires a ground. Perhaps the 4' ground and radials were not sufficient for the unit, or the noise is not actually local to my house. > On Apr 27, 2016, at 10:25 AM, Les Rayburn [email protected] [ABDX] > <[email protected]> wrote: > > In response to several requests from both MW DX’ers 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 isn’t possible. In contrast, these > chokes are designed to work over a limited range of frequencies. In this case > it’s 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, it’s 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 can’t 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. > > > __._,_.___ > Posted by: Les Rayburn <[email protected]> > Reply via web post • Reply to sender > • Reply to group • Start > a New Topic • Messages in this topic (1) > > > Upgrade your account with the latest Yahoo Mail app > Get organized with the fast and easy-to-use Yahoo Mail app. Upgrade today! > The ABDX website www.abdx.org! > VISIT YOUR GROUP > • Privacy • Unsubscribe • Terms of Use > . > > > __,_._,___ _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Be sure to register now for the Joint DX Convention Kansas City, September 9 to 11. Hotel space is filling up. Registration info: http://www.nrcdxas.org Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
