Re: [amsat-bb] AO-7 telemetry analysis #2

["Dennis Ray Wingo" <wingod@xxxxxxxxx>]

On Wed, 03 Jul 2002 01:17:50  
 Mineo Wakita wrote:
>AMSAT-OSCAR 7

>2A  -Y Quad. Array I

>2A      850.00  1150.00 1250.00 990.00  -10.00  -10.00  -10.00  -10.00
>


Looks like the -Y Array has a shorted blocking diode or this is the reverse current through the diode to a failed open array.

Is there any data our there Mineo that shows the -Y Array with a positive current?

Otherwise the spacecraft is in incredible shape.


It would be interesting to find out from Jan what the solar cell technology is (probably ~10% silicon) and try and find out what the attitude of the bird is and do a comparative analysis of the solar array currents.

This would tell at least two things.  One obviously would be the relative array current degredation over the 27 year period which would be very interesting.  Two would be to do a careful thermal analysis (Dick Janssen still around?) of the bird to compare the state then and now.  

That would tell something about the darkening of the cover glass on the arrays and any changes in the absorptivity/emissivity spectrum of the bird in general.

Great data Mineo!

Do you ever get any SEDSAT data anymore?  I still plot that data for the same reasons as above.

The data above would be great to put into a paper for the small sat conference next year.  I know that Jan could have a lot of fun with it.

Take Care
Dennis


____________________________________________________________
Win a first-class trip to New Orleans and vacation Elvis Style!.
Enter NOW!
http://r.lycos.com/r/sagel_mail/http://www.elvis.lycos.com/sweepstakes/
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org