ISS Crossband Repeater - 9k6 APRS?
After noticing that a SatNOGS station (through a fluke of configuration) had decoded a packet [1] on the new repeater downlink frequency, I investigated a bit more and found that all the passes observed recently had 9k6 FSK packet traffic on the downlink.
An example packet: [0.4] NA1SS>0P0PS4,APRSAT:'v&<0x1c>l <0x1c>SI]ARISS-ISS PM2=<0x0d> ------ U frame UI: p/f=0, No layer 3 protocol implemented., length = 48 dest 0P0PS4 0 c/r=0 res=3 last=0 source NA1SS 0 c/r=1 res=3 last=0 digi 1 APRSAT 0 h=0 res=3 last=1 000: 60 a0 60 a0 a6 68 60 9c 82 62 a6 a6 40 e0 82 a0 `.`..h`..b..@... 010: a4 a6 82 a8 61 03 f0 27 76 26 1c 6c 20 1c 53 49 ....a..'v&.l .SI 020: 5d 41 52 49 53 53 2d 49 53 53 20 50 4d 32 3d 0d ]ARISS-ISS PM2=. ------ Is this being generated within the new Kenwood radio, or somewhere else? What does the packet contain? (It looks like there might be some telemetry in there?)
73 Mark VK5QI
Mark,
I also noticed the data stream on the waterfall but when tried to decode it ISS was already too low elevation. Therefore will leave the modem permanently on and forward whatever received to Satnogs and also feedback on the BB.
73
Jean Marc (3B8DU)
On Sep 4, 2020, at 8:28 AM, Mark Jessop via AMSAT-BB amsat-bb@amsat.org wrote:
After noticing that a SatNOGS station (through a fluke of configuration) had decoded a packet [1] on the new repeater downlink frequency, I investigated a bit more and found that all the passes observed recently had 9k6 FSK packet traffic on the downlink.
An example packet: [0.4] NA1SS>0P0PS4,APRSAT:'v&<0x1c>l <0x1c>SI]ARISS-ISS PM2=<0x0d>
U frame UI: p/f=0, No layer 3 protocol implemented., length = 48 dest 0P0PS4 0 c/r=0 res=3 last=0 source NA1SS 0 c/r=1 res=3 last=0 digi 1 APRSAT 0 h=0 res=3 last=1 000: 60 a0 60 a0 a6 68 60 9c 82 62 a6 a6 40 e0 82 a0 `.`..h`..b..@... 010: a4 a6 82 a8 61 03 f0 27 76 26 1c 6c 20 1c 53 49 ....a..'v&.l .SI 020: 5d 41 52 49 53 53 2d 49 53 53 20 50 4d 32 3d 0d ]ARISS-ISS PM2=.
Is this being generated within the new Kenwood radio, or somewhere else? What does the packet contain? (It looks like there might be some telemetry in there?)
73 Mark VK5QI
[1] https://network.satnogs.org/observations/2780486/ _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
G’day Mark,
The 9k6 packet is being generated by the Kenwood. It’s the standard Mic-E format APRS beacon that the radio generates. It carries info that is displayed on a receiving Kenwood radio, such as location, course, and speed. The radio is not receiving GPS data, so most of that “data” has no meaning for ISS. The only things of interest for ARISS are the current program mode (indicated by the status message) and the temperature of the radio final amp.
You can see the temperature as the final 2 characters of the dest address, 0P0PS4 in the packet you quoted. It’s a bit odd, because of the Mic-E encoding. In Mic-E, P-Y decodes as 0-9, so S4 represents 34 degrees C.
Dave, W8AAS
On Sep 4, 2020, at 12:28 AM, Mark Jessop via AMSAT-BB amsat-bb@amsat.org wrote:
After noticing that a SatNOGS station (through a fluke of configuration) had decoded a packet [1] on the new repeater downlink frequency, I investigated a bit more and found that all the passes observed recently had 9k6 FSK packet traffic on the downlink.
An example packet: [0.4] NA1SS>0P0PS4,APRSAT:'v&<0x1c>l <0x1c>SI]ARISS-ISS PM2=<0x0d>
U frame UI: p/f=0, No layer 3 protocol implemented., length = 48 dest 0P0PS4 0 c/r=0 res=3 last=0 source NA1SS 0 c/r=1 res=3 last=0 digi 1 APRSAT 0 h=0 res=3 last=1 000: 60 a0 60 a0 a6 68 60 9c 82 62 a6 a6 40 e0 82 a0 `.`..h`..b..@... 010: a4 a6 82 a8 61 03 f0 27 76 26 1c 6c 20 1c 53 49 ....a..'v&.l .SI 020: 5d 41 52 49 53 53 2d 49 53 53 20 50 4d 32 3d 0d ]ARISS-ISS PM2=.
Is this being generated within the new Kenwood radio, or somewhere else? What does the packet contain? (It looks like there might be some telemetry in there?)
73 Mark VK5QI
[1] https://network.satnogs.org/observations/2780486/ _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (3)
-
Dave Taylor -
Jean Marc Momple -
Mark Jessop