[amsat-bb] Re: AO-7 is not OK

Mike Rupprecht mail at mike-rupprecht.de
Wed Apr 14 09:25:03 PDT 2010

Hi Piraja,

Yes, I made similar observations. If the CW is active on 70cm you can hear
sometimes a very strong deviation in frequency.
The CW beacon partly not decodable. I agree with you it could be an effect
by low batteries or due heavy usage.
See some graphs here: http://www.dk3wn.info/p/?cat=21

73, Mike

-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] Im
Auftrag von ps8rf Piraja
Gesendet: Mittwoch, 14. April 2010 13:22
An: amsat-bb at amsat.org
Betreff: [amsat-bb] AO-7 is not OK

Some days we are seeing very strange behavior in the AO-7.  In some orbits
can only hear the feedback on the downlink when the satellite is approaching
my station at about 30 degrees elevation, before is impossible to hear any
signal via AO-7. Using two pre-amplifier, one in the  TS 2000x and the other
with 0.6 noise with 20 dB gain. During the orbits we transmiting power with
of 30 watts.  The satellite does not respond. Tried with 15 watts It was
then that we hear at certain points on the downlink audio too low. Its best
performance  is when the satellite is almost 90 degrees from my station.
Yet it seems that the satellite is asking for help.

This seems the batteries are not getting enough loads. Or maybe it's
excessive use of power by the users of the satellite.

Maybe it's time for the users of AO-7 rethink the best ways to keep QSO
through it, such as the use of LOW POWER so that over time the satellite is

"Long live the AO-7"


Piraja, PS8RF

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