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. [image: 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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