New EntrySat Cubesat

EntrySat is changed to follow 44385 in network.

Yeah, ok, got you!
I would like to add something like:

      - id: sid
        type: u1
      - id: tm_payload
          switch-on: sid
            0x06: eps_packet_t
      - id: mode
        type: u1

Any objections or suggestions?

I have write something equivalent on my working Kaitai file :smiley:

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Was able to demod two packets from 99990 EntrySat playback IQ USB about 10k below, using sm_other/G3RUH-BPSK-9K6$ wine soundmodem.exe

1:Fm ON02FR To F6KTA <UI C Pid=F0 Len=34> [11:42:40R]

1:Fm ON02FR To F6KTA <UI C Pid=F0 Len=34> [11:43:40R]

Hello Patrick,
I agree with Xtophe. When EntrySat is in visibility of Toulouse, our ground station ask for some tests. You see the acknowledgment of these telecommands. You can also receive sometimes an unmodulated carrier, used for calibrate our receiver … so you need to filter !!
73, Nicolas

Heh, yeah, ok, but filter for what? Only SID==6?

To be very rigorous, you should detect select valid packet with

in the packet header :
id: service = 3
id: subservice = 25

in the packet itself :slight_smile:
id: sid = 6

The CRC is checked by the AX-25 routine ???

I dindn’t understand how the frame decoding is performed ?? Is it done localy by the satnogs client ? Or on the satnog server … I checked the audio file in the server (oog files) and the audio bandwith is near 8kHz … it is too narrow to demodulate a 9600 BPSK signal …

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It is done on the SatNOGS node by the client, using the gr-satnogs OOT GnuRadio module. You can find the flowgraph here:

I am just checking for SID in the latest decoder now.

From this tweet:

1 99999U          19184.68402778  .00085189  00000-0  13880-2 0 00006
2 99999 051.6417 279.4339 0005689 074.7314 052.3234 15.51621104177776
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You can switch on RED-EYE n° NORAD 44364 too . it is working.


Thanks, I’ve changed it in network.

I can manually decode 3 packets from using sm_other/G3RUH-BPSK-9K6/soundmodem.exe where satnogsclient got nothing. Raw IQ uploaded to: 16b signed int.

Edit: using USB with carrier 9600 below center.

Thanks for the IQ file, @surligas @Sleepwalker can you take a look! Thanks!

Maybe just too weak - this obs got one
hs_soundmodem got 3 out of it.

See my earlier post about the TLEs of recent ISS deployments: New satellite: Światowid

EntrySAT appears to be 44428, 44429 or 44430. We’re using 44429 on the network and will check in the coming days how well it works.


NORAD ID of ENtrySAT is 44431

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Hello Freddy, it seems that there is a mistake from NORAD about EntrySat ID :

Can you switch entrySat to 44429 ??? Thks …

It has already been switched. See


Hello, I try to decode the last signal received on stanogs network (Observation #827365). Unfortunately when I lesson (or download) the audio file, the audio bandwidth is 8kHz. My decoder is unable to decode something !! How does it works with previously data decoded for Entrysat (9600bauds) : is the data is decoded locally on the satnogs station or by the satnogs server ? Is it possible to retrieve de audio file with higher bandwidth ?
Thks / 73 Nicolas

Yes, the decoding happens in client side. The signal should be strong and in the middle of the waterfall to be able to decode it from audio which, as you have noticed, is limited in bandwidth.