[amsat-bb] Need help decoding EO-79 packets.

PE0SAT | Amateur Radio pe0sat at vgnet.nl
Thu Apr 21 16:56:15 UTC 2016

Hi Jeff,

Here some extra info that might help:

Use BPSK AX.25 mode when decoding QB50p1, make sure non-AX25 filter is 
not selected.
You can try to replay the file at: 
to see if things are working. There three different signals in the 

QB50p1 1200bps and 2400 bps
DO-64 (Delfi-C3) with 1200bps

They can both be decoded with UZ7HO and AGW Online Kiss.

Maybe the block diagram on the following page will also help in 
understanding how
things can be connected. 

73 Jan - PE0SAT

On 21-04-2016 18:33, Mike Rupprecht wrote:
> Hi Jeff,
> if you use soundmodem by UZ7HO you don't need AGW Packet Engine.
> Firstly start soundmodem software, then AGW Online KISS OR use the 
> QB50p1
> Online decoder.
> If it's connected you should see a green light.
> If you successfully decode a packet you should see something like this 
> in
> soundmodem:
> 2: <NON-AX25 frame Len=125> [18:29:19R]
> 2: <NON-AX25 frame Len=125> [18:29:29R]
> 2: <NON-AX25 frame Len=125> [18:29:39R]
> 2: <NON-AX25 frame Len=125> [18:29:49R]
> 73 Mike
> -----Ursprüngliche Nachricht-----
> Von: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] Im Auftrag von Jeff 
> A.
> Boyd
> Gesendet: 21 April 2016 17:18
> An: amsat-bb at amsat.org
> Betreff: [amsat-bb] Need help decoding EO-79 packets.
> I have been trying for weeks to set up a system to decode telemetry 
> packets
> from
> EO-79 (QB50P1) without success. As I am new at dealing with data from
> satellites that is not already handled by a dedicated program such as
> FUNCube Dashboard, which handles Doppler tracking and packet decoding 
> all by
> itself, I'm still kind of lost as to how all the required components 
> are
> supposed to come together.
> If I can figure out EO-79, goes my thinking, then I can go on to 
> tackling
> other BPSK 1200 baud birds such as the XW-2 constellation. I will list 
> what
> I'm doing below; if someone can please give me a sanity check it would 
> be
> greatly appreciated.
> - Receiver: FUNCube Dongle Pro+, SDR# outputting to a virtual audio 
> cable.
> - SATPC32 tracking EO-79, correcting for Doppler, and controlling 
> SDR#.
> - AGW Packet Engine set up with "Sound Card" TNC (the other end of the
> virtual audio cable), dual port, 1200 baud for each channel.
> - AGW Online KISS set up to connect to the Packet Engine. WINSock 
> remote
> port 8000.
> - Soundmodem by UZ7HO on the same port 8000 and listening to SDR#, 
> which is
> set for USB, 4kHz bandwidth. SATPC32 is keeping the packet traces in 
> the
> center of the 4kHz passband, and I can see the traces appearing in the
> waterfall in Soundmodem. The modems in Soundmodem (2 channels) are set 
> for
> BPSK 1200 baud, and the reticules match up exactly with the traces I 
> can see
> in the waterfall.
> And Soundmodem refuses to decode a single #$%&ing thing. There is an
> occasional "<NON AX.25 FRAME>" that shows up in the list, and Online 
> will show a bunch of garbage, but this mostly occurs when there is 
> nothing
> in the waterfall at all.
> Several sites have said that I'm to connect something to something 
> else
> using virtual serial ports, but none of them have really given me a 
> straight
> answer as to where to connect what to what.
> What am I doing wrong here? Any advice would be ridiculously 
> appreciated.
> 73
> --
> J. Boyd, JR2TTS/NI3B
> the2belo at msd.biglobe.ne.jp
> http://www.flickr.com/photos/the2belo/
> http://www.qrz.com/db/JR2TTS
> Twitter: @Minus2_C

With regards PE0SAT
Internet web-page http://www.pe0sat.vgnet.nl/
DK3WN SatBlog http://www.dk3wn.info/p/
irc://chat.freenode.net #Cubesat

More information about the AMSAT-BB mailing list