[amsat-bb] Re: AO-51 Signal Strength Post Flip
Mark L. Hammond
marklhammond at gmail.com
Tue Feb 9 10:41:44 PST 2010
Thanks for the reports.
Again, I encourage you all to research the power levels OUT at the
comparison times. That has to at least be considered in the
Power is "watts" out
Date 435.150 435.300 Battery V
2009-02-09 19:27:04 oz7sat 0 0.779 0.859 7.660 <--- 859 mW one
year ago! compare to today, listed below!
2009-10-25 18:17:01 oz7sat 0 0.452 0.617 7.868
2009-11-25 17:41:51 oz7sat 0 0.361 0.744 7.581 <-- 745 mW before the flip!
2010-01-15 18:45:31 oz7sat 0 0.437 0.462 7.892
2010-02-09 17:19:06 oz7sat 0 0.452 0.475 7.752 <-- 475 mW today!
We are running a few hundred milliwatts below what we were running
pre-flip, and a good bit less than we were able to run a year ago.
So you all may be seeing the difference between 600-850 mW and 475 mW.
Yes, the bird is aging, and we're doing the best we can to manage the
resources available on-board (the limits now are orbit and battery
condition) . The full illumination periods in the last year or two
have taken their toll on the batteries. What will be interesting is
to see what happens when we return to periods of eclipse!!
Personally, I don't expect the situatio to improve, although it might
be that the batteries will cool and some capacity will return. But
we'll need it with eclipses.
> In the past few weeks, I've often had problems hearing AO-51 here in DO33. A year ago, signals of at least S3 on my FT-817ND were common. Now they are weaker.
> As well, I get the impression that the signal polarity has changed. Formerly, I could hold my Arrow dual-band Yagi with the 2 m elements nearly horizontal and still hear the satellite. Now, I have to turn it nearly 90 degrees, sometimes changing the orientation more than once during a pass.
> Some of that I might attribute to my operating a portable station within a residential area in the city, but I definitely noticed a significant difference between what I hear from AO-51 now and what it was before the satellite was flipped.
> Bernhard VA6BMJ @ DO33FL
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Mark L. Hammond [N8MH]
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