it is in GMSK 2400 downlink with an AX25 protocol. It will emit every 30 s if you ever manage to decode. Don’t hesitate to send me this raw data. THANKS
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DJIBOUTI-1A packets clearly there, but just not enough SNR for me to decode… just need more elevation. I even isolated the strongest packet & looped it in GNU Radio while fine-tuning the exact center freq & filter bandwidth, but I’ll just need more signal to get a decode. Will keep trying!
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Can you tell me where I can download the soundmodem program?
There are many different versions, the main page is at
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DJIBOUTI-1 2K4 AX.25 telemetry. RX FN41iq 45E from IQ replay 12Nov23 0220Z Congratulations to the Team. Great achievement. Data to @Satnogs.
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That relieves me a little. Can you send me the AX25 raw frame please?
Thanks.
Thanks for decoding.
I downloaded it from UZ7HO Personal page - Packet-Radio - English version and checked, but I could not find a soundmodem that could handle AX.25 G3RUH 1200bd.
Can you send me the soundmodem program by email?
That one was created special and can be downloaded from:
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Here is the link to an FM demodulated WAV file from which you may decode the raw data.
Congrats!
Bob
N6RFM
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Thank you
Thanks.
Thanks, Bob! And great job getting those decodes. I wasn’t able to decode that last packet, but the first two look good. Hopefully I’ll get a higher elevation pass tomorrow & can find that extra SNR that wasn’t there for me tonight! Just needed a bit more elevation.
------
U frame UI: p/f=0, No layer 3 protocol implemented., length = 158
dest F4KJX 0 c/r=1 res=3 last=0
source DJIB1A 0 c/r=1 res=3 last=1
000: 8c 68 96 94 b0 40 e0 88 94 92 84 62 82 e1 03 f0 .h...@.....b....
010: 8c 10 c2 ae 4a 5c ab ae 4a 5c 00 00 01 22 98 52 ....J\..J\...".R
020: 00 00 01 00 01 00 33 c1 05 bd c1 c1 00 60 f3 0f ......3......`..
030: 08 3a 17 4e 00 00 f8 f6 f6 f8 f6 cd 64 09 d1 83 .:.N........d...
040: c6 65 00 08 09 cc 11 36 00 11 00 00 ad 02 89 7b .e.....6.......{
050: 66 78 1f 00 00 1e 02 01 b8 01 b8 7f 04 bf 07 fa fx..............
060: 01 66 00 02 02 02 07 01 28 fe d4 40 e8 06 c1 ff .f......(..@....
070: d2 00 19 00 09 00 00 00 00 00 00 00 00 00 00 00 ................
080: 00 00 00 00 00 00 44 4a 49 42 4f 55 54 49 2d 31 ......DJIBOUTI-1
090: 41 20 76 6f 75 73 20 73 61 6c 75 65 20 21 A vous salue !
------
------
U frame UI: p/f=0, No layer 3 protocol implemented., length = 158
dest F4KJX 0 c/r=1 res=3 last=0
source DJIB1A 0 c/r=1 res=3 last=1
000: 8c 68 96 94 b0 40 e0 88 94 92 84 62 82 e1 03 f0 .h...@.....b....
010: 8c 10 e1 ae 4a 5c c9 ae 4a 5c 00 00 01 22 98 52 ....J\..J\...".R
020: 00 00 01 00 01 00 33 c1 05 bc c1 c0 00 60 f2 0f ......3......`..
030: 08 3b 17 4e 00 00 f7 f6 f5 f7 f6 cd 64 09 ce 82 .;.N........d...
040: c6 63 00 08 08 cc 11 36 00 11 00 00 ae 02 8a 7b .c.....6.......{
050: 66 78 1f 00 00 1e 02 01 b8 01 b8 7f 04 bf 07 fa fx..............
060: 01 66 00 02 02 02 07 01 28 fe d4 40 e8 06 c1 ff .f......(..@....
070: d2 00 19 00 09 00 00 00 00 00 00 00 00 00 00 00 ................
080: 00 00 00 00 00 00 44 4a 49 42 4f 55 54 49 2d 31 ......DJIBOUTI-1
090: 41 20 76 6f 75 73 20 73 61 6c 75 65 20 21 A vous salue !
------
2 Likes
could you tell me which tool you can decode this signal ?
. I tried an sdrpp with a sound modem but I can’t decode
For this modulation type, I use GNU Radio (+ gr-satellites) with 2k4 FSK demod and AX.25 (G3RUH=False) deframer. I like the AX.25 display in Direwolf, so the ‘KISS File Sink’ block sends the output to ‘/tmp/kisstnc’ that is available when you run Direwolf with the -p option
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One more addition in DB and Network (and in the first post of this thread), is Impulse-1 (LEO Express-1) at 402.680 MHz.
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Thanks for sharing the IQ file, this gave me the opportunity to create a gr-satellites yml file
name: KAFASAT
norad: 99028
data:
&tlm0 AX25 telemetry:
telemetry: ax25
transmitters:
1k2 G3RUH FSK downlink:
frequency: 435.835e6
modulation: FSK
baudrate: 1200
framing: AX.25 G3RUH
data:
- *tlm0
2k4 G3RUH FSK downlink:
frequency: 435.835e6
modulation: FSK
baudrate: 2400
framing: AX.25 G3RUH
data:
- *tlm0
4k8 G3RUH FSK downlink:
frequency: 435.835e6
modulation: FSK
baudrate: 4800
framing: AX.25 G3RUH
data:
- *tlm0
9k6 G3RUH FSK downlink:
frequency: 435.835e6
modulation: FSK
baudrate: 9600
framing: AX.25 G3RUH
data:
- *tlm0
And this is the output:
-> Packet from 1k2 G3RUH FSK downlink
Container:
header = Container:
addresses = ListContainer:
Container:
callsign = u'KAFSAT' (total 6)
ssid = Container:
ch = True
ssid = 1
extension = False
Container:
callsign = u'KAFSAT' (total 6)
ssid = Container:
ch = False
ssid = 1
extension = True
control = 0x03
pid = 0xF0
info = b'\x08\x02\xc0\xff\x00\xbe\x10\x03\x19\x02\x03\xcd:\x15\xff\xfe\xff\xe4\x00\xd9\x00\xda\x00\x00s\xd4\x01\x00\x07\x01\x06\x01\xf8\x00\x07\x01\x15\x01\x15\x01\x06\x00\x0b\x00\x08\x00\r\x00\x0c\x00\r\x00\x00\x00\x00\x00\x00\x00H\x1fJ\x1f\x00\x00\x00\x00\x97\x131\r\x03\x00\x06\x00\x06\x00\x12\x00\x1a\x00\x04\x00\x04\x00\x04\x00\xb5\x00\xf0\x01\x00\x01\x00A\t\x00\x00A\t\x00\x00e\xf1\x07\x000&\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00y\xf4\xdb\x04\xaf\xf6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x11\x00\x01\xff\xe0\xff\x00\x00\x00\x00\x00\x00\r\x99\x99ds\x01\x01\x00' (total 199)
***** VERBOSE PDU DEBUG PRINT ******
((transmitter . 1k2 G3RUH FSK downlink))
pdu length = 215 bytes
pdu vector contents =
0000: 96 82 8c a6 82 a8 e2 96 82 8c a6 82 a8 63 03 f0
0010: 08 02 c0 ff 00 be 10 03 19 02 03 cd 3a 15 ff fe
0020: ff e4 00 d9 00 da 00 00 73 d4 01 00 07 01 06 01
0030: f8 00 07 01 15 01 15 01 06 00 0b 00 08 00 0d 00
0040: 0c 00 0d 00 00 00 00 00 00 00 48 1f 4a 1f 00 00
0050: 00 00 97 13 31 0d 03 00 06 00 06 00 12 00 1a 00
0060: 04 00 04 00 04 00 b5 00 f0 01 00 01 00 41 09 00
0070: 00 41 09 00 00 65 f1 07 00 30 26 0c 00 00 00 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00a0: 00 00 00 00 00 00 00 00 00 00 00 79 f4 db 04 af
00b0: f6 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00c0: 00 00 00 11 00 01 ff e0 ff 00 00 00 00 00 00 0d
00d0: 99 99 64 73 01 01 00
************************************
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name: KAFASAT (not KAFKASAT)
1 Like
Thank you
Korea Air Force Academy Satellite