Noise in receive

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KB2MEN
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Last seen: 1 month 4 weeks ago
Joined: 2008/11/15 - 21:06
Noise in receive

Hi Folks:
The front audio-out jack on the computer became intermittent so I took it apart. There is a small PCB with 2 USB ports and the Audio In and Out jacks. I could see the ground-ring contact which was easy to push down for more grip. But.. I also noticed that the USB and Audio grounds were tied together on this board. I took out a box-cutter and started cutting traces to isolate the grounds. I did, and now the faint whine that I always heard is gone! I'll bet WSPR will be more sensitive to low levels! I wouldn't be too surprised if many of these boards have grounds tied together that shouldn't. For reference, the case is a RaidMax.

KB2MEN