[amsat-bb] AO-7 Mode B performing poorly

John Papay john at papays.com
Sat Jul 28 18:55:42 PDT 2012

Since AO-7B came out of the eclipsed orbits, it has been
performing poorly.  I can usually do very well on the low
elevation passes towards Europe, but now I may only be able
to hear my own cw signal with no other signals heard.

Today on the 2116utc pass I worked PV8DX on CW but as the bird
moved north, it became apparent that the satellite was starved for
power.  If I used more than 5 watts on CW, the returning signal was
only a key click.  Five watts produced a tone but there was fm'ing.
Voice signals were weak and distorted.  Again I found that using more
than 5 watts on ssb would yield garbled audio.  The satellite cannot
support much activity in this condition.

Let's hope this is only temporary and that the satellite will return
to the level of performance we had before the eclipse periods.  In the
meantime, FO-29 is still producing 1300km orbits between Europe and
North America in our early afternoon.  These high elevation orbits
won't last forever so take advantage of them now.

John K8YSE

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