[amsat-bb] Re: International Space Station-Bounce on 1296 MHz
domenico.i8cvs at tin.it
Mon May 27 16:42:00 PDT 2013
Hi Les, N1LS
Do you know the EIRP used at 1296 MHz by DJ5AR or by PA3FXB
to complete the International Space Station-Bounce on 1296 MHz CW
QSO using the ISS as a passive reflector ?
Thanks for the information
73" de i8CVS Domenico
----- Original Message -----
From: "Les Rayburn" <les at highnoonfilm.com>
To: "AMSAT Mailing List" <amsat-bb at amsat.org>; <vhf at w6yx.stanford.edu>;
"WSJT Group" <wsjtgroup at yahoogroups.com>; "Sean, KX9X Kutzko"
<kx9x at arrl.org>; "Marshall-K5QE" <k5qe at k5qe.com>
Sent: Monday, May 27, 2013 11:27 PM
Subject: [amsat-bb] International Space Station-Bounce on 1296 MHz
> Many of you may have read about the successful QSO between DJ5AR and
> Jan, PA3FXB using the ISS as a
> passive reflector, similar to airplane scatter or EME.
> Using EME protocols and periods of 30 seconds, they completed the QSO
> using CW. This involved modifying
> satellite tracking software, and compensating for the Doppler shift. You
> can read details and hear audio files on
> DJ5AR's blog here:
> This is quite an accomplishment, but I instantly began to wonder if it
> couldn't also be pulled off with much simpler
> equipment using WSJT software such as FSK441 (commonly used for rapidly
> moving meteor scatter QSO's).
> Doppler shift would not be a problem, even with the quick moving ISS,
> since the software is already optimized for
> short transmission periods.
> It might be necessary to modify the standard messaging to allow for a
> complete QSO exchange to happen faster,
> or to shorten the periods to 15 seconds.
> 432 MHz has already proven to be very productive for airplane scatter,
> so I also wondered if 432 might be a good
> band for this type of experimentation. Lots of satellite operators are
> already equipped to operate on 432 and to track
> the ISS in real time with their antennas.
> I'd love to hear some discussion about the possibility of this. It could
> open up a lot of potential grid squares on 432 and 1296
> simply using FSK441.
> Another problem to be solved is classifying the propagation mode in LoTW
> and other logging software. Would this be considered "airplane scatter"
> or would we have to invent a whole new name for this?
> Congratulations to both hams for this accomplishment!
> Les Rayburn, N1LF
> 121 Mayfair Park
> Maylene, AL 35114
> 6M VUCC #1712
> AMSAT #38965
> Grid Bandits #222
> Southeastern VHF Society
> Central States VHF Society Life Member
> Six Club #2484
> Active on 6 Meters thru 1296, 10GHz & Light
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