Thank you for the timestamp, qth etc, and the info about the Spectravue
I examined the file anyway and worked out that a “stereo” signal was I and Q,
16-bits each, LSB first.
I confirm the signal as you found. I averaged small and large numbers of
FFTs. This showed that the signal strength varied, between approximately
11 to 16 dB-Hz. The spacecraft is spinning at about 3 rpm, so this may be
Attached is a typical plot from my my own software. This is not the strongest
signal display; the largest I found was a signal = -45.7 dB over the
noisefloor = -53.8 dB, or SNR = 8.1 dB.
With a bin bandwidth of 0.124 Hz, this equates to a CNR of 16.4 dB-Hz.
73 de James G3RUH