Re: [amsat-bb] Predictability of AO-7 Modes

[Emily Clarke <emily@xxxxxxxxxxxxxxxxx>]

Hi Roger,

Thanks for the kuddos.  AO-7 is really a passion for me, so I am 
really pleased that we have a way to collect data and display 
it.  It's not really "scientific" because it's based on data 
collected from observations rather than any form of telemetry that 
the spacecraft is sending, but it's a good predictor and as you say, 
no sense looking for Mode A in the winter.

I think one thing that is interesting is that there were Mode A 
passes in the winter, and I have a theory that it is staying in Mode 
B or C (low power Mode B) more because people are respecting the QRP 
nature of AO-7.  My theory is that since it's not being over powered 
by strong signals this allows AO-7 to stay in it's higher power modes 
more frequently (originally 8 and 2 watts for Modes B and C, 1 watt 
for Mode A).  But it's really only a theory, again without TLM there 
is no real way to tell for sure.  The other theory is that it may 
have something to do with the duration of eclipses and where (in 
latitude) it emerges from eclipse.  But I haven't finished looking at 
that data yet.

73,

Emily


At 10:13 AM 1/8/2006, Roger Kolakowski wrote:
>Emily, W0EEC, has a great chart on her website which shows that AO-7 has
>"some" predictability as to which mode it will come up in on a month to
>month basis. No more looking for Mode A during the winter months, at least
>in the northern hemisphere. This is a 3 year study which is VERY revealing.
>Check it out...
>
>"AO-7 has shown to have relatively predictable cycles in the mode it will
>support. In the summer months it is likely to be in Mode A a larger
>percentage of the time, and in the winter months it is most likely to be in
>Mode B. Here is a month by month graph based on the input to this site"
>
>http://www.emilyshouse.com/experthams/ao7/stats2.php
>
>Thanks Emily!
>
>Roger
>WA1KAT
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