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 antenna.
73" de i8CVS Domenico ----- Original Message ----- From: "Michael Lipp, HB9WDF" <[email protected]> To: "i8cvs" <[email protected]> Cc: "Ib Christoffersen" <[email protected]>; <[email protected]>; <[email protected]>; "Amsat - BBs" <[email protected]> Sent: Friday, March 16, 2012 2:47 PM Subject: Re: [amsat-bb] Re: Dutch transponder versus the Indian transponder. Hi Domenico 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" <[email protected]>: > 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" <[email protected]> > To: <[email protected]> > Cc: <[email protected]> > 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 >> >> _______________________________________________ >> Sent via [email protected]. 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 [email protected]. 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 [email protected]. 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
