[amsat-bb] E1P telemetry reception

[Ken Swaggart]

Finally worked out the bugs in my receiving setup for E1P.  My antenna is 
only a 70 cm HO loop with a mast mounted preamp. Haven't yet repaired the 
G-5500 (Yaesu hasn't responded to my queries!).  Surprisingly, that antenna 
works quite well for E1P.  Here's how I configured my equipment:

Receiver Mode: LSB
Freq: 437.5017  at pass start (excluding Doppler) drifting down to 
437.50110. This could either be due to a slight error in the keps, or drift 
in the satellite's transmitter.  This requires manual tweaking of the 
receiver in addition to Doppler correction. I tuned the receiver so the 1 
second tuning tone from E1P was at the upper 1200 baud packet marker in 
MixW.

Demodulator:  MixW set at normal 1200 baud packet. Using a virtual serial 
port emulator to connect to the E1P telemetry decoder.  Also fed the audio 
to a KPC-9612, but was not able to decode any packets, even though MixW was 
having no problem with the signal.

I'm really amazed that I could collect data from a cube sat using my omni 
antenna!  So far my best (in two passes) was 23 decoded telemetry frames.

Ken, W7KKE
CN75xa