ADF series of synthesizers
From UK Microwave Group Wiki
Collection of articles / links for the ADF series:
ADF 5355
Circuit diagram of the ADF5355 dev board available on ebay File:_ADF5355_schematic.pdf
ADF4351
Picture and schematic to be posted here....
Designs and PIC controllers / source code for a number of Microwave Synthesizers
[ http://g4jnt.com/Synthesizers.htm ]
PIC Controller module interfacing serial (RS232) to SPI commands for any of a number of different synthesizer types :
downloadable archive of PIC .ASM, .HEX firmware and support software (Windows)