Bill,
I haven't been following this thread, but THANKS! You've answered several
questions that "I" had!
Now I have a question:
I have an 11-meter rig in my shack (Sorry guys, but I started in CB LONG before
I became a Ham and that was in 1981) that has HALF SCALE noise! I also have
the same problem with my 10-meter rig! So basically, they are both useless!
I've turned off all my cordless phones, computers and anything else I can think
of that would cause this, but it still exists.
I live in a residential area so there are houses all around me. I'm HOPING
that the problem is in MY house and not in someone else's house, that way I can
locate and fix the problem!
Any ideas on WHAT could be generating this noise?
Rod
KC7CJO
Bill Turner <[EMAIL PROTECTED]> wrote: ORIGINAL
MESSAGE:
On Fri, 21 Mar 2008 23:17:22 -0400, Tony <[EMAIL PROTECTED]> wrote:
>
>Need to replace the PC in the shack and would like to find something
>that's RFI-free out of the box.
------------ REPLY FOLLOWS ------------
What kind of RFI? RFI caused by the computer and picked up by your
receiver or RFI caused by your transmitter and picked up by your
computer?
A couple of general observations: The first kind is caused mostly by the
monitor, not the computer. Going to an LCD monitor, as you are, will
cure most of that kind. The second is more difficult, but try to have
the computer and transmitter physically close together with the two
chassis bonded together with a short ground wire. Without that bonding
wire, your interconnecting wiring creates a sort of small loop antenna.
The bonding wire shorts it out.
And best of all, if you can, is keep your antenna as far away from your
equipment as possible, and use coax feedline instead of open wire. Use a
balun at the junction of antenna and feedline to prevent current from
flowing on the outside of the coax. Such current flows as a result of
unbalance in the antenna system and is a major cause of RF-in-the-shack
syndrome, which in turn is a major cause of computer RFI.
73, Bill W6WRT
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