Bill,
You have a ground loop to the laptop.. I bet that you will lose the hum
if you break the ground from the radio to/from the laptop sound card..
Better isolation from the radio to the sound card.
You might even try an extra ground from the laptop to station ground,
but it is most likely a audio loop, isolation transformers should take
care of it..
73,
Dudley
WA5QPZ
Bill and Cindy wrote:
> I just got my new Omni-VII last week. It seems to be a great radio, the
> second radio in the
> shack is an Omni-VI+, so I knew what to expect......
>
> There is a hum on the audio. The Omni-VII is keyed from an old Compaq laptop
> running
> N1MM software, through an Array Solutions SO2R switch box. The hum COMPLETELY
> disappears when the AC/DC adapter power cord is pulled out of the laptop and
> the
> computer is on battery power. I don't remember this happening with the Omni
> VI+....
>
> Hmmm (no pun intended). Is this the AC/DC adapter going bad? The computer
> apparently
> takes 18.5 V at 2.7 A based on the listed output of the AC/DC adapter. What
> if I just
> power the laptop from the 13.8 V MFJ power strip that powers all the other
> accessories?
> Will this work?
>
> Thanks, Bill / KO7AA in Tucson
>
>
>
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