[amsat-bb] Dutch transponder versus the Indian transponder.
oz1my at privat.dk
Fri Mar 16 03:36:25 PDT 2012
The two transponders are not built exactly the same way.
The Indian transponder has an AGC - but according to my memory Williams
transponder has a diode limiter.
I think that can be the difference.
In theory the AGC will regulate the gain down so that the "stronger" station
"drowns" the ones with a lower uplink signal.
The diode limiter will of course limit the signal for the strong stations -
but also create distortion in a broad frequency range for all stations.
That is if there is a very strong signal - or many stations at the same
Whatever the reason KEEP THE POWER DOWN
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