It appears that I already have a ADF4350 PLL board. The chip on the board can produce 137MHz to 4.4GHz signals, so 2256MHz (for 144MHz IF) or 1968MHz (for 432MHz IF) is within the range.
I also have an Arduino board, so now it is a matter of software.
I found that someone had made a piece of software for programming the (later ?) 4351 chip (same, except the lower frequency possible is about 37MHz). I will have to find out if the software will program the 4350 chip as well.
Update :
I have some 2500-2700MHz and 2150-2162MHz MMDS down converter units lying around, and may order a version that has only 2500-2700 MHz range.
If the RX mixer in those units are passive devices it might be possible to modify the unit for use as a very low power transmitter converter.
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