[Lowfer] Computer noise

Mon, 14 Jan 2002 18:20:11 -0500

Hi Bob,

Forget the magic. First you have to determine how the computer noise is
getting into the signal path and make changes accordingly.

1) Is the noise being picked up by your antenna? If so, the antenna has to
be moved farther away from the computer.

2) Is the noise getting into the antenna feed line? Short out the antenna
(at the antenna itself)  to the coax lead-in with a 0.1uf capacitor and see
if the noise remains. If it does you may need to add a 1-1 isolation
transformer to the coax lead-in at the receiver to isolate the coax shield
from the computer's chassis.

3) Is the noise the result of a ground loop between the receiver and the
sound card? May need an audio 1-1 isolation transformer there.

Sometimes the noise is persistent but 99 times out of a hundred there's a
fix.

Good luck!

Bill WA

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Monday, January 14, 2002 4:28 PM
To: [email protected]
Subject: [Lowfer] Computer noise

Anyone have any luck or magical remedies to take care of RF noise from a 
computer short of turning it off? I found that I hear "signals" generated 
from my computer in signal strengths of S-9 or better...which wipes out much

of the LOWFER band and pretty much keeps me from using any software to pick 
up the LOWFER stations.

Bob Carter
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