[amsat-bb] CAS4A CAS4B SDR recordings?

Scott scott23192 at gmail.com
Sat Jun 17 05:32:43 UTC 2017

Sorry it took me so long to zip & upload the IQ recording from Friday 
morning U.S. time, Douglas.

If anyone has not had a pass from the new CAS-4A or 4B satellites yet, feel 
free to download a PCM-16 IQ wav file of the pass from:


... for anyone not completely familiar with SDR's yet, this is not an audio 
.wav file, but an "IQ" wav file suitable for replaying in SDR software. 
Comes in very handy for testing decoders or sharing like this between people 
so we can benefit from others' big antennas, geographical location, or lack 
of sleep!

I certainly hope the voice transponder has a signal as strong as these 4k8 
telemetry streams.  This file was recorded unattended using a 2m X-Quad (no 
pre-amp) to an SDRPlay SDR.  However, after seeing the signal on the screen, 
you might be able to receive it with a coat hanger.

Instead of downloading my recording and playing it back yourself, if anyone 
would just like to see the signal and volume of data being downloaded, I put 
up a short video at:



-Scott,  K4KDR


-----Original Message----- 
From: Douglas Quagliana
Sent: Friday, June 16, 2017 12:30 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] CAS4A CAS4B SDR recordings?

Does anyone have an SDR recording of CAS4A / CAS4B? I would like to try to 
demodulate and decode the 4800 baud telemetry signals and see what they say.


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