[amsat-bb] NASA on the Air images with MMSSTV overlay?

[John Brier]

His station was running unattended.

On Sun, Oct 28, 2018 at 2:03 PM Miles via AMSAT-BB <amsat-bb at amsat.org>
wrote:

>
>
> ps:
> These were Not Local Re-Broadcast images.
> They were from ISS.
>
> How can you Tell:
> For one thing Doppler.  When ISS has AOS, the down link will be 3.3K
> higher in frequency.
> If you have a FM receiver with a discriminator meter (Rare item on new
> FM Junk) you tune the FM
> discriminator to center the frequency.  And you will see 145.803.3 as
> the center FM frequency.
> When ISS is overhead, the Doppler will be zero for a second and the
> down-link will be 145.800.
> As ISS passes away, the Doppler will cause the frequency to drift lower
> until at LOS downlink will be 145.997
>
> If you have tracking software and a beam, the AOL and LOS signals will
> match.
> I had an 83 degree pass over Boston today.
> Those passes are hard to track since the satellite only Rises until is
> over head (very little azimuth).
> Then once it passes your QTH, you need to switch the beams very fast 180
> degrees in azimuth.
>
> aaah the good old days of Mir/ISS.
>
> wf1f
>
> On 10/28/2018 1:23 PM, Greg D wrote:
> > Hi folks,
> >
> > I let my radio and SSTV program run last night.  Several passes, none
> > super high, so my expectations were low.  Also the whole downlink
> > frequency thing.  But, as I sift through the images and static of the
> > night, I see about a half dozen partial pictures!  Yea!
> >
> > But, three of them, two from the 12:35z pass, and one from the 14:11z
> > pass, have an overlay from MMSSTV calling "CQ SSTV"!  Were they sent
> > down from the ISS this way, or was someone locally rebroadcasting them
> > (incorrectly)?  The image from the 11:02z pass seemed fine, though I
> > only go a part of it ("Curiosity on Mars"), as was the 15:49z pass.
> >
> > Next pass, a low one, beginning in 4 minutes at 17:27z... Fingers
> crossed.
> >
> > Greg  KO6TH
> >
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