[amsat-bb] PSAT2 SSTV & PSK mixed

[Robert Bruninga]

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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