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Re: KO25 Question

Hi Gary.
> I have been trying to download messages from KO25 and I don't think that I
> am even hearing the packet burst. I am using a Kenwood THD7A with an Arrow
> satellite antenna. I track the bird with Nova. The frequency I am using for
> the downlink is 436.500.
> Am I correct in assuming that even with the TNC in my radio turned off, I
> should still hear the 9600 baud packet burst.
> What am I doing wrong? Why am I not hearing the packet burst? Do I need a
> preamp?

KO-25 transmits 9600 baud FSK data that is "scrambled" (randomized),
so it sounds like the white noise you hear from an unsquelched narrow-band
FM receiver.  436.500 MHz is the correct downlink frequency (+/- doppler).
KO-25 data sounds only slightly quieter than the noise you would hear
when tuning your FM receiver to an unused frequency.

73, de John, KD2BD

-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
Satellite : AO-16, LO-19, KO-25      |  Morse : -.-  -..  ..---  -...  -..
Packet    : KD2BD @ KS4HR.NJ.USA.NA  |  WWW   : http://www.njin.net/~magliaco/
Video     : 426.250 MHz/439.250 MHz  |  FAX   : +1.732.224.2060
-=-=-=-=-=-=-=-=-=-=-=- Linux doesn't cost.  It pays. -=-=-=-=-=-=-=-=-=-=-=-
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