[amsat-bb] Re: AO-07 healthy CW

[Geoff]

Sil - ZL2CIA wrote:

snipped

> Geoff,
>
> You made a comment:
> "Check channel 6D, anything other than about 0.5 means that the others
> are likely to be dodgy (invalid)".
>
> Can you tell me any more about this. How is the value should in channel
> 6D derived?
>
> Boy, a circuit diagram would be a diagnostic great tool here.
>
> Sil - ZL2CIA
>
>
>
>
>
Hi Sil et al,
    this little snippet regarding channel 6D tells the story. It is from 
an e-mail Jan King sent after the bird was discovered .

> voltage reference circuitry. The latter I
> know is working because the last telemetry value is 651. The "6" is 
> just the
> row number of the telemetry value but the 51 means that the 1/2 volt
> reference is measuring 0.51 volts. I know that telemetry equation by 
> heart
> since it was used as the calibration value for the rest of the telemetry
> system. So the telemetry has a fair chance of being decoded and making 
> some
> sense