Re: [amsat-bb] RUDAK DSP weak signal test

["Vince Fiscus, KB7ADL" <vlfiscus@xxxxxxx>]

Thanks Jim, I glad to see updates like this posted.  It make us feel like 
we're more involved with what is happening.


At 08:56 AM 8/2/02 -0600, Jim White <jim@coloradosatellite.com> wrote:

>At the end of the RUDAK window today we left one of the DSP modulators on 
>generating a signal 33 dB below the 9k6 FSK signal at 11.1 MHz in the IF 
>passband.  At the WD0E station I can detect that carrier consistently at 
>the beginning of the RUDAK window or a range of about 52k km. Of course as 
>the range drops it's much easier to hear.  See 
>http://www.coloradosatellite.com/Papers/RUDAKOps/SDish.htm
>for the receive equipment here.
>This is a pretty weak signal and if you can detect it you are hearing 
>pretty well.  Of course it's in the digital passband only during the RUDAK 
>window.
>
>We will try to leave it on while we continue testing the other DSP 
>functions and software, all of which are aimed to creating links to RUDAK 
>that can be used with modest equipment.  Unfortunately we can't grantee it 
>will be there all the time but will at least try to announce when it 
>wasn't on after the fact.
>
>Other work today involved the convolutional coding and scrambler settings 
>on the 153k6 modulator on RUDAK-A.  All tests performed indicated 
>everything is working ok but we ran out of time to finish everything scheduled.
>
>Jim
>wd0e@amsat.org
>jim@coloradosatellite.com
>
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