Hi Bob,
Fredy at SatNOGS managed to decode one frame from these observations:
[0.4] USNA14-5>APUSNA,TELEM:{BR0000003463,0000003463,BV7.5,BT23,BC+166,BB57, 12B3,5B47,3B54,XV6.5,X+C6,X+T-9,X-C360,X-T23,YV3.8,Y+C6,Y+T-10,Y-C190 ,Y-T63,ZV3.4,Z-C53,Z-T0,XG-13.2,YG-19.0,ZG2.4,XM-51.9,YM-134.3,ZM317.4,GT7, 0100 ------ U frame UI: p/f=0, No layer 3 protocol implemented., length = 219 dest APUSNA 0 c/r=0 res=3 last=0 source USNA14 5 c/r=0 res=3 last=0 digi 1 TELEM 0 h=0 res=3 last=1 000: 82 a0 aa a6 9c 82 60 aa a6 9c 82 62 68 6a a8 8a ......`....bhj.. 010: 98 8a 9a 40 61 03 f0 7b 42 52 30 30 30 30 30 30 ...@a..{BR000000 020: 33 34 36 33 2c 30 30 30 30 30 30 33 34 36 33 2c 3463,0000003463, 030: 42 56 37 2e 35 2c 42 54 32 33 2c 42 43 2b 31 36 BV7.5,BT23,BC+16 040: 36 2c 42 42 35 37 2c 31 32 42 33 2c 35 42 34 37 6,BB57,12B3,5B47 050: 2c 33 42 35 34 2c 58 56 36 2e 35 2c 58 2b 43 36 ,3B54,XV6.5,X+C6 060: 2c 58 2b 54 2d 39 2c 58 2d 43 33 36 30 2c 58 2d ,X+T-9,X-C360,X- 070: 54 32 33 2c 59 56 33 2e 38 2c 59 2b 43 36 2c 59 T23,YV3.8,Y+C6,Y 080: 2b 54 2d 31 30 2c 59 2d 43 31 39 30 2c 59 2d 54 +T-10,Y-C190,Y-T 090: 36 33 2c 5a 56 33 2e 34 2c 5a 2d 43 35 33 2c 5a 63,ZV3.4,Z-C53,Z 0a0: 2d 54 30 2c 58 47 2d 31 33 2e 32 2c 59 47 2d 31 -T0,XG-13.2,YG-1 0b0: 39 2e 30 2c 5a 47 32 2e 34 2c 58 4d 2d 35 31 2e 9.0,ZG2.4,XM-51. 0c0: 39 2c 59 4d 2d 31 33 34 2e 33 2c 5a 4d 33 31 37 9,YM-134.3,ZM317 0d0: 2e 34 2c 47 54 37 2c 30 31 30 30 .4,GT7,0100 ------ We were curious why 9k6 was chosen, as it seems to be difficult to decode even with these strong signals on a high pass.
73, Alan KU2Y
On Fri, Jul 26, 2019 at 12:31 PM Robert Bruninga bruninga@usna.edu wrote:
We are guessing at the 437.605 center freq. It was purchased as 437.600 but we think we remember it did better at 437.605 on one of our radios.
Do you see an offset? If so, simply ceneter where you see it. And see if decodes are better.
Thanks
Bob
*From:* Alan Johnston alan.b.johnston@gmail.com *Sent:* Friday, July 26, 2019 12:26 PM *To:* Robert Bruninga bruninga@usna.edu *Cc:* amsat bb amsat-bb@amsat.org; Jeff King jking@usna.edu; Jin Kang kang@usna.edu *Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
Hi Bob,
At SatNOGS, we are getting some good 437.605 MHz 9k6 signals from BRICSat-2/USNAP-1 . They haven't automatically decoded yet, perhaps due to the 5kHz frequency offset. But you can download the audio file and you should be able to decode them.
Here are some good ones:
https://network.satnogs.org/observations/861257/
https://network.satnogs.org/observations/861256/
https://network.satnogs.org/observations/861250/
Future good observations will be displayed here:
https://network.satnogs.org/observations/?future=0&bad=0&unvetted=0&...
Good luck!!
73,
Alan
KU2Y
On Fri, Jul 26, 2019 at 8:22 AM Robert Bruninga via AMSAT-BB < amsat-bb@amsat.org> wrote:
USNAP1 on 145.825 also uses the call of
USNA14 on 437.605 MHz 9600 baud
And has been added to the http://aprs.org/sats.html web page
*From:* Robert Bruninga bruninga@usna.edu *Sent:* Thursday, July 25, 2019 11:56 PM *To:* amsat bb amsat-bb@amsat.org *Cc:* Jin Kang kang@usna.edu; Jeffery King jking@usna.edu; Robert Bruninga bruninga@usna.edu *Subject:* Re: [amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE
FREQ is 437.605 (corrected)
Object is 44355
I captured objects via VK6HAM at 151929 to 152812 for PSAT2 and for USNAP1 from 151803 to 152711 showing USNA P1 about a minute ahead of PSAT2.
It is only alive for about 60 to 70 minutes when in the sun apparently by looking at the T# telemetry count.
Bob
On Thu, Jul 25, 2019 at 11:42 PM Robert Bruninga bruninga@usna.edu wrote:
Standard 9600 baud AX.25. No special software. Just need raw packets.on 447.605
PSAT2 and USNAP1 were delppyed together and have identical external shape and so should be in same orbit, but due to mass differences, USNAP1 should be LEADING PSAT2. We need to know by houw much. Since PSAT2 is likely object 44354, and 44355 is very slightly leading (by 1 minute) that could be it.
Bob
On Thu, Jul 25, 2019 at 11:33 PM Jeff Moore via AMSAT-BB < amsat-bb@amsat.org> wrote:
So what do we need to copy the downlink data?? Is there an app or is it straight ax.25 packet???
Jeff Moore -- KE7ACY CN94
On Thu, Jul 25, 2019 at 8:27 PM Robert Bruninga via AMSAT-BB < amsat-bb@amsat.org> wrote:
It looks liike PSAT2's sister cubesat finally woke up today (a month
after
launch) at 0614z on 25 July:
http://www.findu.com/cgi-bin/raw.cgi?call=usnap1-1&time=1
The VHF telemetry shown here has only bus voltage. The digipeater is OFF and will remain off until we find out what happened.
In the mean time, we need all the capture we can get of the 9600 baud downlink on 437.605 MHz +/- Doppler. There is a beacon every 30 seconds.
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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 _______________________________________________ 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