btw, when I put the diodes in I could find no difference in the board.
But I wasn't looking to hard. The board did have a different letter. The one on page 16 is a 05 board and is an a board. The 2 I put the mod on are 06 boards and they were g boards. It seemed like the newer boards were cheaper than the 05 board I used as a check.
The coding on the boards does not seem to have anything to do with the frequency, i.e. a does not equal an a tx.