LO for my next 47GHz transverter.
ADF4351 PLL board $33.30
Arduino Mini $2.50
Minikits multiplier $32.50
The piece of Vero board has some resistors to reduce the 5v levels on the Arduino to 3v for the PLL board (divider using 220 and 330 ohm resistors).
There's a switch (not visible in the photo) which changes the PLL output between 3,912MHz (144MHz I.F.) and 3,911.9166667MHz (145MHz I.F.).
The output from the multiplier is either 11,736MHz or 11735.75MHz at -2dbm so I'll need to add an amplifier to bring the level up to about 13dbm.
The transverter (Kuhne MKU 47 G2) multiplies this by 4 to get the final LO frequency of 46,944MHz or 46,943MHz.
I haven't used C in years so writing the code was a minor challenge. I had an issue with variable scope which had me pulling out what little hair I have left plus I'd keep forgetting the ; at the end of each line
However, it's now all working.