Hi Tony,
Thanks for your reply. From looking to the picture on one off the softrock pages
I got the idea that the board was directly plugged into an USB connector of the computer. Looking more careful it seems the board is running from an USB cable connector?
My question was more in general, not softrock specific. I was surprised to see an unshielded
front-end that close to a PC
I have been playing quite a bit with Linrad Spectran dspblaster etc just running off a TS 850 at least
30 ft from the PC and I get all kinds of stuff from the computer. In fact it means that I will have to
put the computer in a second box with all inputs and outputs well decoupled I think. This is just
monitoring basically antenna noise.
I am expecting a board shortly and will let you know, using the Delta44 sound card.
73 Rein W6/PA0ZN
kb9yig wrote:
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Hi Rein,
I have built about 25 of the v4.0 SoftRock40 receivers and find the PC
noise does not cause much of a problem. When the receiver is
calibrated to S9, (-73 dBM, 50 uV RMS), the baseline is around -135
dBm with 10-15 dB spikes riding on the baseline every 1 kHz or so. Also at the LO frequency, around 7.054-7.056 MHz there is a large
broad spike associated with the LO and the fact that the soundcard
contributes lots of noise near zero frequency.
I will be quite interested in the experience of SoftRock40 builders as
they finish their kits. If I can help with problems in getting the
little receive running, I would be happy to do so.
73,
Tony KB9YIG
--- In softrock40@..., "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
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