Greg,

Congrats on excellent decode for a 10 degree pass! 

I could get a fair decode even with a simple delta loop VHF antenna kept broadside along the pass direction, of course for an overhead pass. Signal strength in my IC 2730 had gone up to full scale at some point of time. Hence I do think that higher powers are being used by ARISS for SSTV.
SSTV Image received with Delta loop VHF antenna.jpg
Had read somewhere that 25-50W is used for SSTV compared to 5W for crossband repeater. It should be there, otherwise I would not have got stronger signal strength than a local repeater at 30 km, from the space station at 400 km.

73
Jon VU2JO

On Sat, Nov 16, 2024 at 8:45 AM Greg D via AMSAT-BB <amsat-bb@amsat.org> wrote:
Hi folks,

I've been having exceptional results receiving the SSTV images from the
ISS during this 40th Anniversary event.  I missed the last one, but in
prior years I'd see a much weaker signal, and have a number of fading
events.  I also observe that the ISS seems to favor left-hand
polarization, though that's more likely something on my end (dirty relay
contacts or similar).

Sample image, attached.  This was from the just completed pass, toward
the very end.  It was a low pass overall, and the ISS was under 10
degrees elevation at the start, perhaps a few degrees by the end.  I
also would have been aiming through a large oak tree, yet perfect copy
where I would have expected something marginal.

Did they change anything on the ISS?

Greg  KO6TH

p.s.  Very nice certificate arrived from an earlier pass.  Thanks!


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