[amsat-bb] Dutch transponder versus the Indian transponder.

Ib Christoffersen oz1my at privat.dk
Fri Mar 16 03:36:25 PDT 2012

Hi all,
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

73 OZ1MY/Ib

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