[amsat-bb] Re: Full band transverters for satellite operations?

KA2AEV@aol.com KA2AEV at aol.com
Tue Jun 12 13:13:45 PDT 2007

DownEast Microwave has provisions for Changing the LO Crystals by using a  
switch in their Transverters
I did this in their 70cm transverter using a 28mhz IF 
In a message dated 6/12/2007 3:17:20 P.M. Eastern Daylight Time,  
kd6ozh at comcast.net writes:

I  haven't seen anything other than transverters with 2 switchable crystals.  
However, one manufacturer has suggested recrystalling for a 24-30 MHz  IF.



----- Original Message -----  
From: "Alan P. Biddle" <APBIDDLE at mailaps.org>
To: "AMSAT-BB"  <amsat-bb at amsat.org>
Sent: Tuesday, June 12, 2007 14:47  UTC
Subject: [amsat-bb] Full band transverters for satellite  operations?

> With the advent of rigs like the FLEX-5000,  features are becoming 
> available
> which exist in no traditional  rig.  However, for operation on VHF, UHF, 
> and
> microwave  frequencies, you are obviously going to need a transverter. 
>  Using
> a 28-30 MHz IF, you can cover 2 meters with 2 LO crystals.   However, once
> you get to 70 cm, it would take 15 crystals to do  this.  Now admittedly, 
> you
> wouldn't necessarily want to  cover the entire band, as an FT-847, TS-2000,
> etc do.  But you  would want more flexibility than just one or two 2 MHz
> segments for  both space and terrestrial operations.  More if you wanted to
>  include basic FM repeaters.
> Given that there are no (?)  transverters which have a 20-30 MHz IF width,
> has anyone seen a  transverter with a tunable IF, instead of crystals?  Or
>  alternatively, a VFO-like "VLO" which could be plugged into the 
>  transverter
> crystal socket, or something equivalent?  There used  to be such VFOs for
> crystal rigs 3-40 years ago.  I doubt that a  transverter would maintain 
> full
> specs over a wide range, but  such flexibility would be handy.  Perhaps 
> this
> is a  solved problem with the microwave community?
>  Alan

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