AO-73 TLM Signal Changed?
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
Hi,
FC1 has been placed into transponder mode for the holiday season.
73
Dave, G4DPZ
Many thanks. Will give it a try, although this pass is only 6 deg EL (in 13 min). Have never caught the xponder on b4, 73, N0AN Hasan
On Sat, Dec 15, 2018 at 9:00 AM David Johnson dave@g4dpz.me.uk wrote:
Hi,
FC1 has been placed into transponder mode for the holiday season.
73
Dave, G4DPZ
Nayif-1 EO-88 has a strong FUNcube style beacon also. The Nayif dashboard works like the one for AO-73.
Nayif-1: . 145.940 MHz 1200 bps BPSK FUNcube beacon ~400 mW
What works at my station is I start around 145.941 MHz at AOS and follow the Doppler downward during the pass.
-- 73 de JoAnne K9JKM k9jkm@amsat.org
David, Was able to work CW thru AO-73 at EL of 2 deg wiht my X200 collinear. Tnx info, 73 N0AN Hasan
On Sat, Dec 15, 2018 at 9:00 AM David Johnson dave@g4dpz.me.uk wrote:
Hi,
FC1 has been placed into transponder mode for the holiday season.
73
Dave, G4DPZ
participants (3)
-
David Johnson -
Hasan al-Basri -
JoAnne Maenpaa