[amsat-bb] PSAT PSK31 downlink

Robert Bruninga bruninga at usna.edu
Sun May 31 16:27:59 UTC 2015

I noticed the satellite about 1.5 minutes behind the original ULTRASAT3
I also noticed W0DHO calling CQ PSAT.  And a few other signals.  Remember,
operate full duplex and just leave your transmitter on the full pass and
keep your CQ dump going while watching for responses the entire pass.
Since most PSK31 programs don't run full duplex, you might need to run two
instances?  Good luck figuring out the sound cards!


-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of David
Sent: Saturday, May 30, 2015 2:50 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] PSAT PSK31 downlink

I've been observing that with the current keps the Downlink frequency of
PSK31 beacon is about 2Khz low.

A good US pass over the US at about 1936.

What I have been doing is decoding the entire 3 KHz with DM780's
Supersweeper or Fldigi  and fixing TX at about 600Hz.

That way I catch everybody and there is no need to match frequencies.

I've been trying to TX below 1KHz to minimize interfering with folks
operating normal 10m PSK.

Dave W0DHB

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