[amsat-bb] Re: Dutch transponder versus the Indian transponder.
domenico.i8cvs at tin.it
Fri Mar 16 07:40:52 PDT 2012
Hi Michael, HB9WDF
I think we have another problem too: Since the Dutch transponder is very
sensitive someone will attempt to use it in FM using an HT and arrow
----- Original Message -----
From: "Michael Lipp, HB9WDF" <hb9wdf at bluewin.ch>
To: "i8cvs" <domenico.i8cvs at tin.it>
Cc: "Ib Christoffersen" <oz1my at privat.dk>; <pe0sat at vgnet.nl>;
<pe1rah at yahoo.com>; "Amsat - BBs" <amsat-bb at amsat.org>
Sent: Friday, March 16, 2012 2:47 PM
Subject: Re: [amsat-bb] Re: Dutch transponder versus the Indian transponder.
I think we have also another problem: In the last few years, the OP's
growing up without fullduplex TRX (Ic-706 and similar) and use the ssb sat.
They can't hear her own downlink signal from the bird.
73's de Michael
HB9WDF, Michael Lipp, JN47AE
Am 16.03.2012 um 12:14 schrieb "i8cvs" <domenico.i8cvs at tin.it>:
> Hi Ib, OZ1MY and William, PE1RAH
> Thank you for the information about the diode limiter into the William's
> I got the link of PE1RAH describing the block diagram of indian and Duch
> transponders but without information about AGC or diode limiter.
> 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
>> Whatever the reason KEEP THE POWER DOWN
>> 73 OZ1MY/Ib
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