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Re: AO40 APOGEE WAV files



AMSAT et al,

I captured 2 more WAV files. and noticed that my Doppler notations in the
previous Email were way off due to using 145 MHz instead of 2401.  So here
is a new summary of all files... In any case, I was tuned to center on my
DSP-12 and did not retune during the 60 second WAV recordings.

> I posted some WAV files of what I am hearing at Apogee on the 40 footer.
> Since the spin modulation is known, maybe you guys with DSP can recover
> the data.  My DSP-12 does not.  It only flickers.
> 
> There are five 1 minute recordings which span about 6 minutes.  The
> computed doppler moved by only about 25 Hz during these recordings, but I
> noticed much more than that change in pitch.  My estimate would be about
> 100Hz or more.  Moving upward.  Probably my converter drift.
> 
> Date is 01-05-2001
> Ground Station is at 39.0 N -76.5W
> Dish is 12 meter with 60 degree LNA (at 2200 MHz) with 30 dB gain
> Converter is just an LO and mixer (1980 MHz)
> Receiver is an AOR-5000 tuned to 421.3 +/-, USB with 3 KHz filter
> Signal shows about 1/2 S unit above the noise which is S7
> Recorded at 8khz sample rate, 8 bits
> 
> FILE              start time  Doppler  Range  MA   AZ   EL
> ----------------  ----------  -------  -----  ---  ---  ---
> a40-01051553.wav  15:53:30    8290      54k    175  173   50
> a40-01051555.wav  15:55:00
> a40-01051556.wav  15:56:30
> a40-01051557.wav  15:57:49
> a40-01051559.wav  15:59:30 
> no file recorded  16:02:?     8703      53k    177  179   50.6
* a01051052050.wav  20:50:00    33502     15864  243  220   35
* a01051052051.wav  20:51:35    33827     15464  243  220   35
> 
> First 5 files in  ftp://tapr.org/aprssig/dosstuff/APRSdos/a40-0105.zip
> Next two files in ftp://tapr.org/aprssig/dosstuff/APRSdos/a0105.zip
> 
> If there is recoverable data here we can do this as needed, though it does
> take manual intervention during working hours... etc..

de WB4APR@amsat.org, Bob

See my APRS LIVE pages    http://web.usna.navy.mil/~bruninga/aprs.html
See APRS SATELLITES       http://web.usna.navy.mil/~bruninga/astars.html
See MIM/Mic-E/Mic-Lite    http://www.toad.net/~wclement/mim2.htm

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