I've been decoding/uploading AO-73 TLM for a few months. The signal has always had a charactertic "look":
(Using the SDR, so each signal has a specific and easily identified 'signature'
Small center hump, with two large horns spiking every couple seconds. Very distinctive.
Today, I see the signal now has a 100% duty cycle spike dead center on top of the small hump. I don't recall every seeing it before. Am I hallucinating...again? EO-88 and JO-97 have identical signatures, but I don't recall them having the center spike, either.
The last two passes here, b4 sunrise the signal was waaaay weak. Much weaker than normal, even for this time of day. I thought it might relate to AO-73 being in eclipse...and decodes were terrible, again, compared to normal for me.
After > 18,000 uploaded frames from me, one would think I couldn't have missed that center spike all these months...but ...
Has something changed? 1044 software doesn't look like it has been updated.
73, N0AN Hasan