It was a standard ground loop. This sort of problem can appear
any time something is grounded in more than one place. The usual
fix is to break the ground in one of them.
73 Stan, N3HS
-----Original Message-----
From: writelog-bounces@contesting.com
[mailto:writelog-bounces@contesting.com] On Behalf Of Garry
Shapiro
Sent: Monday, February 03, 2003 2:27 AM
To: writelog@contesting.com
Subject: RE: [WriteLog] Hooking Isolation Transformer?
Stan:
Sounds like your hum was differential mode--i.e.on the audio--and
the
low-end rolloff of the isolation transformers took it out. What I
am
experiencing appears to be due to the transformers themselves by
magnetic
coupling.
Garry, NI6T
> -----Original Message-----
> From: writelog-bounces@contesting.com
> [mailto:writelog-bounces@contesting.com]On Behalf Of Stan
Staten
> Sent: Sunday, February 02, 2003 14:41
> To: 'Wayne Alexander'; writelog@contesting.com
> Subject: RE: [WriteLog] Hooking Isolation Transformer?
>
>
> I used two Radio Shack audio isolation transformers in a small
> project box that I inserted in the middle of a standard stereo
> patch cable. Got rid of the hum that I saw on the RTTY screen.
> I had seen a spike every 180 cycles. Now the display is clean.
>
> 73 Stan, N3HS
>
>
>
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