I bought a 16 foot USB extension in case I needed it, and I have matching long audio cables.
The monitor is the culprit most of the time, but just in case I have a Industrial PC that they were throwing out at work, It's fully encased in metal including a grounded cover for the CD/Floppy drive area. With it came a 15.1" LCD monitor that I hope will be quieter that the regular monitors I have.
I still have not received my SR-40. When it was first available I stayed late and bought some, then next day I was 8th on the list, with the current list I'm down to 50 or lower. And people all around me have received theirs. It's a conspiracy, I should have worn my aluminium hat!
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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.
Regards,
Art
The supply from the USB connector is 5V. Are you using a separate power
supply?
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Cecil
KD5NWA
<www.qrpradio.com>
I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...
