Re: [softrock40] Re: Interference from PC?
- Frank and the group.
Until recently, the sound card has been thought of as a secondary
accessory. By that I mean it plays the windows warning sound, or an
mp3 or wav file and allows one to listen to sound effects when
playing computer games.....
Only recently has anyone though of using it for serious work,
although there are a few exceptions.
Even on todays best sound cards, there is no shielding despite having
16 bit sensitivity on the inputs and being mounted inside a big noise
generator, esp[ecially bad for magnetic interference.
Nothing surprises me when it comes to sound cards, they use dimestore
time bases and are far from what they could/should be.
However, they're cheap and plentiful and give us a taste of what we
can do when better sound cards become more common place.
>The soundcard is one of the most vulnerable spots for letting in--
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When I operate on the low bands (40M thru 160M) I have to turn off my
PC's. In fact I sometimes have had to unplug them completely, as the
power supply isn't completely off when the On/Off switch is in the Off
I found the problem to be caused by the computer's switching power
supply. In fact I lost a power supply in one of my computers recenly,
and replaced it with a better grade supply, and then was happy to find
that the noise from that computer was gone.
Try unplugging your computer completely and see if that quiets things
--- In email@example.com, "observer35" <rein0zn@i...> wrote:
> Hi all,
> Just new to the group.
> Does anybody experience interference from the PC on 40 meters?
> What about noise and garbage on the 5 V USB line?
> 73 Rein W6/PA0ZN