[R-390] PSK-31

[Barry Hauser]

Barry wrote:
> Has anyone tried receiving PSK-31 on an R390A?  If so, how did you feed
the sound card?  I was thinking of using the Line Output, but I don't know
the impedence of the typical soundcard?  Are they lo-Z, hi-Z?  Would it
matter all that much for PSK-31?  Would I be better off using the
diode-load?

Haven't actually tried it yet, but I recently aquired a prewired
"interface".  This particular one is for receive only and consists of just a
1K to 1K mini audio transformer in a small plastic project box.  Has a mono
mini phono socket and a stereo mini phono socket with only one channel
wired.  Not sure if that's to accommodate a stereo line in for the card or
stereo headphone jack on the more typical radios used.  Looks like all the
parts came from Radio Shack and was priced accordingly.

I have a whole bunch of links to web sites with that circuit plus others and
a variety of software for download -- but not where I'm at now.  I suspect
that isolating the circuits is the main thing,  impedance matching not as
critical.  I read that output from the radio needs to be as low as possible,
so you'll need some way to control it, so maybe makes sense to use the audio
out so you can use the gain control.

Barry




>
> I assume the R390A will be stable enough for the task, but I don't know.
Looking for advice.
>
> 73,
>
> Barry - N4BUQ
>
>
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