Re: [amsat-bb] RUDAK testing - help please

[Peter Guelzow <peter.guelzow@xxxxxxxxx>]

Hi Wayne,

The test code which Assi is working on is only a small part of things to
come. This is to get a feeling about the I/Q modulator and performance
of the DSP modems.  And indeed it's a good test for you and other
to test the system sensitivity, similar to the ZRO test in the good
old days..

The idea is to use the DSP modems for 1200 Bit/s BPSK PACSAT type
operations, which would allow us to run RUDAK in parallel with
the transponder passband.


73s Peter DB2OS

> Assi Friedman wrote:
> 
> The AO40 RUDAK team uploaded test code to one of the DSPs. This code generates a carrier at around 2401.625MHz (+/- doppler). The intent of this code is to help users do a ZR0 type experiment and test just how good their S-Band receive station is.
> The program generates a clean carrier at full RUDAK power, and then starts decreasing power in 3dB steps, all the way down to -30dB. One full cycle is 30 seconds. The resulting pattern is a sawtooth, and it is active between MA128 and MA160.
> 
> Wayne replies:
> 
> This is a neat thing, but I strongly question the value of displacing transponder operations for 2 hours and 23 minutes of every orbit for a repetitive carrier level test.  If this is the only thing RUDAK is being used for, I think the time allocated to RUDAK should be reduced substantially.
> 
> I confess I do have a selfish interest in reducing the RUDAK time period.  I want to work Rolf in Micronesia, and the only windows I have are during the RUDAK time period.



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