[amsat-bb] Full band transverters for satellite operations?
Alan P. Biddle
APBIDDLE at mailaps.org
Tue Jun 12 07:47:12 PDT 2007
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?
Before a mad scientist goes mad, there's probably a
time when he's only partially mad. And this is the time
when he's going to throw his best parties.
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