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RE: New S Band Converter



While I'm going to go for a transverter, instead of a converter, it would be
good to know what the approximate price of these modified converters is, for
future reference. 

Tony Langdon. 
Systems Development and Support. 
ATC Training Australasia.  Level 2 321 Exhibition St Melbourne  3000. 
Phone:  1300 13 1983     WWW:  http://www.atctraining.com.au 



> -----Original Message-----
> From: Murray Peterson VK2KGM [mailto:vk2kgm@ihug.com.au]
> Sent: Tuesday, 16 January 2001 15:17
> To: AMSAT-BB; Tony Langdon
> Subject: Re: [amsat-bb] New S Band Converter
> 
> 
> In Australia, Ian MacKenzie, VK2ZIM, can be contacted at 
> Comsys on +61 2
> 9878 1188 and he can supply Conifer grid dish (24dbi) 
> antennas  and modified
> Conifer down converters. Choose the IF you want. These units 
> have a good
> interdigital input filter and a noise figure of about 0.7db.
>     The disadvantage is that they do cost money but so does 
> anything else
> that works well.
> 
> Murray Peterson
> VK2KGM
> 
> ----- Original Message -----
> From: "Tony Langdon" <tlangdon@atctraining.com.au>
> To: "'Howard Long'" <howard@howardlong.com>; "Roy Welch"
> <rdwelch@swbell.net>
> Cc: <amsat-bb@AMSAT.Org>
> Sent: Tuesday, January 16, 2001 11:31 AM
> Subject: RE: [amsat-bb] New S Band Converter
> 
> 
> > > *** 2m 23cm IF, 70cm 13cm IF
> >
> > Probably the most common scenario.
> >
> > >
> > > Pro's:
> > >
> > > o Easy to find 23cms uplink trasmit converters on 2m.
> > >
> > > o Fairly wide 13cm sub-band available to you.
> >
> > In some areas (e.g. Australia), may simplify choices for 
> 13cm Rx (common
> > converters from defunct pay TV systems here have a LO of 
> 1951 MHz, so 2400
> > MHz becomes 449 MHz, which could be reached with a slightly 
> modified 70cm
> > Rx.
> >
> > > Con's:
> > >
> > > o Your expensive 23cm Transmit converter will likely be very
> > > narrow band on
> > > 2m and be limited to the satellite sub-band (1268MHz).
> >
> > You will need separate xtals for satellite and terrestrial, 
> unless you can
> > mod your IF Tx/Rx to go out of band.
> >
> > > Pro's:
> > >
> > > o Nice wide band transmit, likely to be able to use TX 
> converter for
> > > terrestrial 23cm too. (You'll need to mod your FT-847).
> >
> > Generally, this is the case, most rigs only cover 10 MHz 
> out of the box
> > here.
> >
> > > o May be difficult to find 70cm IF TX converters. I think
> > > there may be a
> > > technical consideration in using a 70cm IF due to local oscillator
> > > considerations and in band transmit mixing products.
> >
> > I'd imagine this is a similar scenario to 2m -> 70cm, but I 
> happen to have
> a
> > 2m - 70cm transverter.  It uses double conversion, down to 
> 10m, then back
> up
> > to 70, to avoid any spurious products leaking through the chain.
> >
> > > o Very limited sub-band of 13cm available to you.
> >
> > In VK, not an issue.  only need to cover 2400 - 2404 MHz 
> for terrestrial
> and
> > satellite operation (our terrestrial is conveniently on 2403 MHz).
> > ----
> > 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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