Well done Dave!!
I think I'll order several modulator chips in view of your & Frank's experiences. At least they've got reasonable pin spacing so not the end of the world to remove one from the board.
I could only find one Ebay listing for them and that from China. Aliexpress also seems to have several. Where did you get yours?
How easy was it to program up the FPGA? I assume you used a Windows machine? I'm going to have to try with a PC running Linux as that's all I have access to but someone else said they couldn't get it to work using Linux.
Mind you, I've got to hone my SMD skills which as yet are non existent!
All the best
Nick