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TR: Parabolic Mode S downconverter



 
> Jeff F6CWN performed some measurements on my own Parabolic 
> converter and found a 0,9 dB NF and a 36 dB gain.
> I use it with a 21 turns helix directly connected to the 
> converter and the average beacon amplitude at apogee is about 
> 2 S points on the IC-821H meter.
> This system is good enough for CW/SSB contacts at apogee, but 
> not for a correct RUDAK 9,6 kbds decoding with a Symek TNC3-S 
> modem. A dish would certainly be the solution ...
> The converter does NOT like 40 W of RF applied to its 144 MHz 
> port :o)).
> I had to replace the output BFS20 transistor by a new one, 
> after, as many other, I tried to transmit into the converter.
> Welcome myself to the club ...
> 
> 73 de Jean-louis F6AGR
> 
> > -----Message d'origine-----
> > De: Ron G. Seiler [mailto:r_seiler@junction.net]
> > Date: samedi 24 novembre 2001 17:04
> > À: amsat-bb@AMSAT.Org
> > Objet: [amsat-bb] Parabolic Mode S downconverter
> > 
> > 
> > Hello,
> > 
> > I am considering using the Parabolic Mode S downconverter for 
> > AO-40.  How
> > does this unit compare in performance to the other 
> > downconverters in use and
> > are there any known problems associated with it?
> > 
> > Thanks.
> > 
> > 73,
> > 
> > Ron VE7VVW
> > http://woodstock.irlp.net
> > 
> > 
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> > 
> 
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