On 05/14/20 13:57, Leffke, Zachary via AMSAT-BB wrote:
Again, not a drop in replacement for something like the DigiLO (Though I did confirm the digiLO has specific switch settings that would produce Ifs at 2m or 70cm for a 1265-ish RF freq.....there are a couple options). The Si5351 goes up to 160 MHz for starters (not 6 GHz), is a square wave generator and produces lots of harmonics (filters!)........but it is cheap, simple to use, and that first link above shows how to make a pretty cheap, GPS disciplined signal generator.........There are other 'watch outs' about the base crystal frequency when using the higher frequencies....not sure exactly what the issue is, something about step size......but that's the fun of homebrew.....lots of threads to pull.
Zach,
Someone industrious person could create a break-out board for the MAX2870/MAX2871 and get 6 GHz. It would require careful engineering, but would be interesting.
--- Zach N0ZGO