On Tue, 19 Jan 2010 14:57:16 -0500, Joe Subich, W4TV wrote: >Improve the grounding of your station, >including direct grounds on both the K3 and computer >to the common ground point and add common mode chokes >to both your feedline and the "Line In" connection to >your computer.
I agree with the advice, but I would not CALL it "grounding" -- that implies ground rods and all that mess. Rather, it is BONDING. It is unlikely that a connection to EARTH is part of a solution. BONDING is simply a very short, beefy copper connection between the CHASSIS of all of the equipment. Most important is between the chassis of the K3 and the chassis of the computer. See http://audiosystemsgroup.com/HamInterfacing.pdf And yes, a beefy coaxial ferrite choke as close as practical to the feedpoint of your antennas, and ferrite chokes on those audio interconnections. Those chokes must be wound so that they are resonant where you are having problems. Follow the guidelines for coaxial chokes in my Choke Cookbook in http://audiosystemsgroup.com/RFI-Ham.pdf and use the measured data in Appendix One for small wire chokes as a guide for chokes on the audio lines. Little clip-ons will not solve problems on 80M. You need lots of turns. 73, Jim Brown K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
