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

[i8cvs]

Hi Ib, OZ1MY and William, PE1RAH

Thank you for the information about the diode limiter into the William's
transponder.

I got the link of PE1RAH describing the block diagram of indian and Duch
transponders but without information about AGC or diode limiter.

http://www.qsl.net/pe1rah/HAMSAT-info.htm

I hope that William will informe us on this matter.

73" de

i8CVS Domenico

----- Original Message -----
From: "Ib Christoffersen" <oz1my at privat.dk>
To: <pe0sat at vgnet.nl>
Cc: <amsat-bb at amsat.org>
Sent: Friday, March 16, 2012 11:36 AM
Subject: [amsat-bb] Dutch transponder versus the Indian transponder.


> 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
> time.
>
> Whatever the reason KEEP THE POWER DOWN
>
> 73 OZ1MY/Ib
>
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