Hi, In the case of FUNcube the on board sensors give their readings as n bit values when they are interrogated. This data is agregated into a data frame for transmission using forward error correction to improve the s/n ratio.
The problem with on board conversion is that you would have to store the scaling/offset/logarithmic values for all channels on board, in rom. These are usually only characterised during thermal cycling / illumination testing etc and would have to be uploaded to the satellite rom. Not necessarily a simple task. It is easier to do it on the ground where we can tweak the calculation factors. 73 Dave, g4dpz On 9 Dec 2013 13:52, "Dave Marthouse" <[email protected]> wrote: > I noticed over the years that satellite beacon downlinks transmit their > telemetry in a form that must be translated by a telemetry app to their > engineering values. Since the information is transmitted from the > satellites > why not provide the engineering values in the downlink without the extra > step having to be done on the ground? What is the logic of doing this? > > > > > > Dave Marthouse N2AAM > [email protected] > > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
