[amsat-bb] AO-73 telemetry received via FO-29

Zach Leffke zleffke at vt.edu
Fri May 6 22:35:59 UTC 2016


you beat me to the punch!!!!!!!!!!!!

We also received AO-73's signal via FO-29 today at the VTGS (we only got 
6 packets!).

We did this as part of a class project for ECE-4644 Satellite 
Communications, and the students that were with me during the 
observation of the event received a half letter grade bump on their 
grade for the class project.  The student project was to build a piece 
of simulation software that would predict when the chain events between 
the two birds would occur and to compute the doppler offset and link 
budget in one second time steps for each event in a two week period.  
I'm proud to say they not only predicted when the event would occur, 
they were SPOT ON in the doppler computation (from around +5 kHz to 
about +10kHz offset from center of FO-29's downlink here in Blacksburg VA).

Score for Amateur Radio supporting Students' Education!

And Congratulations Paul!  If I'm not mistaken, this is a first ever in 
Amateur Radio satellite work, reception of a crosslink? Way to go!

-Zach, KJ4QLP

Research Associate
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305

On 5/6/2016 1:11 PM, Paul Stoetzer wrote:
> Good afternoon,
> I was able to decode 9 packets of telemetry from AO-73 via FO-29's
> transponder at 1647 UTC today. Signals were unusually strong as the
> satellites were close together, so I decided to try feeding my
> recording of the pass into the Dashboard.
> See an image of the Dashboard and a screenshot from SatPC32 showing
> where the two satellites were at the time here:
> https://twitter.com/PRStoetzer/status/728631296658944000
> I was using just an Arrow antenna, High Sierra Microwave LNAA432
> preamp, and an FT-817.
> 73,
> Paul, N8HM
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