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

[Alan]

Zach,

Probably the first telemetry relay, but not quite the first relay.  I recall literally decades ago
there was a relay, probably but not definitely from 70 cm to 2 m to 10 m.  It might have included AO-7
in its first incarnation.  Perhaps some of the really OTs might recall the details.  Still, a great
achievement.  Especially calculating the hop to hop Doppler!

73s,

Alan
WA4SCA





<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Zach Leffke
<Sent: Friday, May 06, 2016 5:36 PM
<To: amsat-bb at amsat.org
<Subject: Re: [amsat-bb] AO-73 telemetry received via FO-29
<
<AHHHHHHHHHH...........
<
<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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<_______________________________________________
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