On 8/6/11 9:31 AM, N0JY wrote: > I'm having trouble getting telemetry. Jerry, is this a night-side pass with the satellite in low power mode? The coding is not optimal for a signal that's present only a small fraction of the time, as it takes 16.384 sec at AOS to "fill the pipe" in the de-interleaver used to combat fading. It's barely done that when the transmitter turns off again at 40 sec.
It works much better on the day-side passes with a continuous signal, even if it's fading deeply. The CW beacon is 1 kHz below the (suppressed) carrier of the BPSK-1000 beacon. Make sure your radio is in USB mode and accurately tune the CW beacon so that it comes out at 500 Hz. This will center the BPSK at 1500 Hz. It extends from 500 to 2500 Hz (2 kHz total bandwidth) between spectral nulls. That's not much narrower than a regular SSB filter, so make sure your passband shift filter, if any, is set to pass it. 73, Phil _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
