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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