Vic:
Certainly it is the case that the remedy that solves one emi problem might
make another one worse. That is what makes emi so difficult.
73,
Steve
AA4AK
Brunswick ME
At 04:33 PM 1/29/2005 -0800, you wrote:
Stephen W. Kercel wrote:
If radiation from the exterior surface of the antenna feedline were the
only mechanism that causes emi, then you would be right, choking it off
would solve the emi problem. The energy in the transmission line would be
radiated by the antenna or turned into heat by either the line losses or
by the losses in the materials used to make up the choke. However, emi
can be caused by many other mechanisms, and as one other poster to the
reflector has reported, improving his RF ground substantially mitigated
his problem.
I understand that there are other paths, such as pickup on the
power/phone/speaker lines directly from the antenna, etc. This is why I
suggested that the fellow use ferrites on the power leads to his stereo
and modem. My point about choking off RF on the feedline was just that an
RF-free feedline is easier to achieve (unless you are using a random wire
antenna) than an RF ground.
I have to say that the guy who reported an improvement may have gotten an
improvement -- but not from the fact that his rig had a better ground,
rather from the change in the RF environment that his ground system
caused. In other words, it might make it better, but it also could make
it worse.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
