Well about 10 years ago I had built a trx with a solfan head, and had a few QSO'swith them. So if I dig properly in my docs I might still find some stuff. As
far as I remember, it was all straight foreward, the only catch had been
that the regulated suply to the gunn diode tended to ocillate, it took a
small seris resistor to fix that, main problem was to find out what was giong
on in the first place.
One disadvantage of the solfan head was that it does not easily tune tu the QRG
used by others. So, although they comunicate with each other fine, they will
not with other OM's.
Why have I given up on 10GHz WBFM? Because there is noone QRV anymore!
All trafic has moved to ssb with an incredible gain in distance, and since
transverter kits are around for about 200$, there is no need for WBFM anymore.
(Same as AM on HF?)
However, if you want more info just for playing around, send me a mail.