Recentlly I purchased some DMC microwave modules tu build a 24GHz transverter. This modules are designed to work at 22 / 23GHz but can work well at 24GHz with a minumum work and be purchased in ebay.
The set is composed by a DRO locked oscillator, upconverter, downconverter and LNA. The DRO locked oscillator, uses from 90 to 110 MHz as reference. The upconverter uses a 310MHz IF input and outputs over 15dBm ( 30 mW). The downconverter have a IF output of 1.4GHz, and have a second donwconverter to convert from 1.4GHz to 70Mhz. Finall the LNA have over 15dB of gain and a NF over 2.5dB / 3dB
All the modules use 8.4V dc except the LO that uses 8.4V and -5V. Googling a bit, I found some info about the modules: