Re: [softrock40] Re: Interference from PC?
- I'm brand spankin' new to the group so didn't see the original thread.
Expecting a sensitive receiver to operate just inches away from a
wideband noise source is optimistic (IMHO). For best results, it
needs shielding just like any other receiver and or transmitter does.
Computer noise might not show up as clean carriers or be identifiable
by tuning across the band. It appears as an elevated noise floor most
of the time, which sounds like background noise. I'm sure many people
have interference from their own computers and most don't even
realize it's there because it sounds rather like normal atmospheric noise.
For absolute best results, shield it. For casual listening on a
crowded band, don't worry about it and run it as supplied.
My softrock-40 is going on LF when I get it and it will be located
away from the computer and shielded. Switching supplies, florescent
lamps and computer interference is pretty severe at 190 kHz and I
want to have good reception. I'm even considering magnetic shielding
due to the nature of the interference at these frequencies.
>The supply from the USB connector is 5V. Are you using a separate power--
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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 firstname.lastname@example.org, "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