I'm thinking of replacing the 200 MHz VF with an external GPS-locked 100 MHz OCVCXO driving a 2x 2N5109 push-push doubler - unless someone has a schematic handy for a 200 MHz push-push, or even a differential, oscillator that uses a 100 MHz crystal. I've seen a reference to a 200 MHz push-push oscillator done by JPL, but can't seem to get to the schematic - says it used 2x 2N5108's (yep - that was "5108"). 73, Dan KB5MY/6
If you have some more details on what you're looking for, I can see about finding more information. [I just buy doubler modules from Wenzel, and I think they just use WJ style diode doublers and a MMIC buffer].
James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875
