[amsat-bb] Fwd: USNAP1 lives! - capture UHF data pse -UPDATE

Fri Jul 26 16:50:05 UTC 2019

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 ... at 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 at 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 at gmail.com>
> *Sent:* Friday, July 26, 2019 12:26 PM
> *To:* Robert Bruninga <bruninga at usna.edu>
> *Cc:* amsat bb <amsat-bb at amsat.org>; Jeff King <jking at usna.edu>; Jin Kang
> <kang at 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&failed=0&norad=99970&observer=&station=&start-time=&end-time=
>
>
>
> Good luck!!
>
>
>
> 73,
>
> Alan
>
> KU2Y
>
>
>
> On Fri, Jul 26, 2019 at 8:22 AM Robert Bruninga via AMSAT-BB <
> amsat-bb at 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 at usna.edu>
> *Sent:* Thursday, July 25, 2019 11:56 PM
> *To:* amsat bb <amsat-bb at amsat.org>
> *Cc:* Jin Kang <kang at usna.edu>; Jeffery King <jking at usna.edu>; Robert
> Bruninga <bruninga at 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 at 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 at 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 at 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.
> >
> > Bob, WB4APR
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> _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at 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!
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>