Surplus Electronics in Ohio has them: https://www.surplus-electronics-sal...arch_in_description=1&keyword=xr-2211&x=0&y=0I'll let you know. It will be a couple of weeks or so though. Ordered from China.
First, is C2 correctly placed? It looks as if it will shunt out all the RF passing between the LNB and RCVR sockets.
External 5k POT, didn't put that in the schematic since, I didn't put the Arduino or Atmel chip and or the LCD, in the schematic.What and how are you doing contrast control on the LCD?
I am using an external SD card module and using the SPI bus.And do you have a serial output for logging?