DownEast Microwave has provisions for Changing the LO Crystals by using a simple switch in their Transverters I did this in their 70cm transverter using a 28mhz IF Mike KA2AEV

In a message dated 6/12/2007 3:17:20 P.M. Eastern Daylight Time, [email protected] 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.

73,

John KD6OZH

----- Original Message ----- From: "Alan P. Biddle" [email protected] To: "AMSAT-BB" [email protected] 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 WA4SCA

************************************** See what's free at http://www.aol.com.