[amsat-bb] Re: ARISSatTLM
n0jy at lavabit.com
Sat Aug 6 12:34:18 PDT 2011
Yes, it was last night around midnight-thirty Central Time.
I had done some earlier tries during the "warm up" testing last weekend
in the daylight with no good result, though.
I have switched the input to my Windows 7 PC and I will let it capture
what it does tomorrow morning, to compare. Since the daylight passes
will all be while I'm at work, perhaps I'll alternate between the Vista
and the Windows 7 PCs during the week to see what I come up with.
Thanks and 73,
On 8/6/2011 2:17 PM, Phil Karn wrote:
> 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
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