AO-85

AO-85(Fox-1A) trace to decode DUV

DUV (Data Under Voice)
Fox-1A successful launch - 8 Oct 2015, 12:49 UTC
http://www.ne.jp/asahi/hamradio/je9pel/foxbison.htm

   


AO-85 Voice recorded - 11 Oct 2015
http://www.ne.jp/asahi/hamradio/je9pel/51011fx4.wav

> Hi this is amateur radio satellite Fox-1.


USB Sound Blaster installed - 25 Nov 2015

It's means to avoid the PC inside of noise at the time of reception,
and purpose the good sound quality pursuit.

     

(1) Control Panel -> Sound Audio Device -> Sounds
(2) Sound recording -> Volume -> Select, Line-In
(3) Rig -> Soundmodem -> Settings
(4) View of 144.660MHz 1200bps_APRS [External_SP ON]
(5) Rig -> HS-Soundmodem -> Settings
(6) View of 144.640MHz 9600bps_APRS [Connector Sub]        (memo)


UWE-3 using Line-In - 26 Nov 2015



 I tried UWE-3 9k6 Line-In reception
 using the new Line-In input system
 that was introduced in the above.


AO-85(Fox-1A) finally succeeded in decoding - 29 Nov 2015

I finally succeeded in decoding AO-85(Fox-1) Telemetry. My System is
TS-790S, USB_Sound Blaster, Win_XP, Decoder.
20:46-21:00 UTC, 28 Nov 2015, Ele 62 SW-W-NE, 145.980MHz FM

   

   


AO-85 in this morning - 30 Nov 2015

06:13-06:27 JST, 30 Nov 2015, Ele 28 SW-W-N, 145.980MHz FM
21:13-21:27 UTC, 29 Nov 2015, Ele 28 SW-W-N, 145.980MHz FM

In this pass, my callsign was placed on the top of the server in the fact that
the most recent reception. Because the other is followed by the callsign of Japan,
South America, and North America, I seen that trajectory of the satellite has been
traced. The eye pattern in the bottom right of the decoder was displayed as the
maximum value SNR = 7.3 and its value was sometimes displayed as SNR = 9.0.



 To clear the count in the decoder,
 
    File -> Delete Payload Files

 If necessary, you have to copy txt_file
 with the contents to the another folder.
                                  (JE1CVL)


[Supplement] Fox-1 satellites include two telemetry formats:

 - Slow Speed, also called Data Under Voice (DUV) is 200 bps FSK data sent
   at the same time as the transponder audio. Whenever the transmitter is
   on, data is being sent. This happens during beacons and during live QSOs.

 - High Speed is 9600 bps FSK sent instead of the transponder. This is used
   for data intensive experiments such as the Virginia Tech Camera and the
   University of Iowa HERCI experiment. This is only active when commanded
   from the ground. You can recognize High Speed because it sounds like an
   old school computer modem.

 - FoxTelem will receive and store both formats assuming you can feed it
   audio that does not have the frequencies below 200 Hz filtered.
   For High Speed, the audio must also extend to include the full 9600bps
   bandwidth of the FM signal.  For both modes this is best achieved from
   a Software Defined Radio or from the 9600 bps packet port of some radios.
   See the user guide for more details.


AO-85 decoded using Software - 18 Dec 2015

I decoded only one frame from AO-85 DUV using Soft-TNC,
RDLSDR(USB) + SDR#1327 + "Fox 1 Telemetry Analysis Tool"
23:00-23:13 UTC, 18 Dec 2015, Ele 17 N-NE-E, 145.980MHz FM
08:55-09:09 UTC,  9 Jan 2016, Ele 53 S-E-EN, 145.980MHz FM

     


AO-85 DUV - 5 Feb 2016
10:46-11:00 UTC,  5 Feb 2016, Ele 36 WN-N-ES, 145.979MHz WFM
23:11-23:24 UTC, 18 Mar 2016, ELe 27 WN-N-ES, 145.979MHz WFM

I received it using software on 5 Feb 2016, after an interval of one month.
I received 31 data at once. I don't do the strange thing particularly so far.
I noticed later that I might have turned off a preamplifier.

  


[Reference]
http://www.ne.jp/asahi/hamradio/je9pel/foxproje.htm
http://www.ne.jp/asahi/hamradio/je9pel/lightsai.htm
http://www.ne.jp/asahi/hamradio/je9pel/foxbison.htm
http://www.qsl.net/py4zbz/fox.htm
http://www.amsat.org/?page_id=4532
http://www.amsat.org/tlm/