[amsat-bb] PSAT2 SSTV & PSK mixed

[Hans BX2ABT]

Hello Bob,

I've taken a picture of the waterfall from the raw IQ file so the 
frequency is not correct, but here it is: 
http://bx2abt.com/main/data/_uploaded/image/20190701-1257_435360-PSAT2.png

The PSK31 signal is around 380 Hz, but still can't decode it. Anybody 
who wants to try: here is the audio file. 
http://bx2abt.com/main/data/_uploaded/media/20190701-1257_435360-PSAT2.mp3

I don't have a digital setup for HF, so can't do PSK31. It also means a 
dual setup for audio/PTT on one PC. I doubt if I have enough USB ports 
for that, hi hi.

Later....

Hans

BX2ABT


On 07/01/2019 10:49 PM, Robert Bruninga wrote:
> Yes, PSK31 and SSTV are in the same audio..  Did you capture a picture of
> the waterfall so we can see how the two look?  PSK31 users should avoid
> the center of the passband where the SSTV tones are 1200 to 2300.
>
> Also, we would be happy to see a good image of a waterfall with multiple
> PSK31 traces in it.  So far, I don't think anyone has claimed to have made
> the first PSK31 contact via PSAT2.
>
> Since the 10m PSK31 uplink will shift a total of about 1 KHz during the
> pass.  Users should probably always begin at the 29.481x frequency that
> will have them at about 1 KHz in the downlink passband.  They will then
> shift down during the pass.
>
> But ideally, people will uplink with the special PSK31 full-duplex
> Transmit program written by andy Flowers that will auto-adjust your
> uplink to maintain a constant tone in the downlink.  Then you can select
> any initial TX tone that shows your signal between 400 Hz and 1 kHz.  And
> you will ermain their throughout the pass.
>
> This is just a first stab at a procedure.  It is subject to change as we
> see more users.
>
> Bob, WB4APR
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Hans BX2ABT via
> AMSAT-BB
> Sent: Monday, July 1, 2019 10:21 AM
> To: AMSAT <amsat-bb at amsat.org>
> Subject: [amsat-bb] PSAT2 SSTV & PSK mixed
>
> Finally got a chance to tonight to see if I could get some signals in from
> PSAT2. Got a very nice image on a 58 degree pass
> (https://pbs.twimg.com/media/D-ZE3vHU4AE0Ah5.png), but I noticed it was
> intertwined with a PSK signal. Is that supposed to be?
>
> Got a stand-alone PSK signal a while later, but FLdigi couldn't decode it,
> because it looked like two separate PSK signal? How can you decode it
> then? (And yes, if the answer is out there accept my apologies: I have not
> been paying attention this past week. Sorry).
>
> 73 de Hans
>
> BX2ABT
>
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