[amsat-bb] Re: Dutch transponder versus the Indian transponder.
Michael Lipp, HB9WDF
hb9wdf at bluewin.ch
Fri Mar 16 06:47:16 PDT 2012
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"
>> "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
>> Sent via AMSAT-BB at amsat.org. 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 AMSAT-BB at amsat.org. 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
More information about the AMSAT-BB