[amsat-bb] Re: Full band transverters for satellite operations?
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
> which exist in no traditional rig. However, for operation on VHF, UHF,
> microwave frequencies, you are obviously going to need a transverter.
> 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,
> 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
> 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
> specs over a wide range, but such flexibility would be handy. Perhaps
> is a solved problem with the microwave community?
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