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Telemetry.




Today I was asked how I came by the results of the TLM I posted re: LO-19.

There are two ways to translate the TLM.

1) Use Mike Rupprecht's (DK3WN) excellent software at <http://www.dk3wn.info/software.shtml> mirrored at the LA2QAA/GM1SXX site at ...

<http://www.observations.biz/>

Or ... to make it more interesting you can do it "longhand" like this ... (see the attached pic) ... though some would say it's about as interesting as watching paint dry.

You can learn a *LOT* by monitoring 17 year old birds.

(Don't be "naughty".....GM1SXX)

Taking some of  today's TLM.

0503081016Z ... (which translates to 03-March-08 at 1016 UTC) ... we get 1 control and 8 TLM channels.

LUSAT HI HI
AO AVA AB4 TDA ANV TB6 ADN AVE AE6

The channels equate to ...

0 = T
1 = A
2 = U
3 = V
4 = 4
5 = E
6 = 6
7 = B
8 = D
9 = N

...and the equations are ...

Ram (version)  0 = no errors
                          E " error

CH 1 = 636 divided by 131 = 4.85 volts.                                    nominal +5v
CH 2 = 0.064 times 174 = 11.1 volts.                                         nominal +10 battery voltage   
CH 3 = 0.354 times 081 = 28.6 degrees C                               nominal  CW transmitter temp 
CH 4 = 10.9 + 180 squared divided by 40.1 = 21.36 mW       nominal tx output power     
CH 5 =  0.356 times 136 minus 76 =  21.36 degrees C          nominal box temperature 
CH 6 =  0.7 x 189 = 132.3 mA                                                     nominal +10 v current   
CH 7 =  0.15 x 135 = 20.25 volts                                                 nominal +Z voltage panel    
CH 8 =   0.056 times 156 = 8.3 volts                                          nominal +8.5 voltage   

Now ... if "ya'll" all have a squint at the attached pic from a "professional" TLM program you'll see that today's telemetry is correct.

(Copied "manually" by LA2QAA with the characters written three times above eachother - to stay 'awake' with 12wpm CW) 

DEDEEZY! - and GM1SXX is right - (he usually is.....LA2QAA) - when he says it will be interesting to watch the TLM regarding the battery status after 17 years in space. As usual, I agree with him.

73 John.   <la2qaa@amsat.org>
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