It appears that the receiver board (at least) has a problem or two. For one, part of the trace from IC U4 pin 2 to the connection point P3-2 is missing on the postscript (at least) plot.

Bob Teeter reports a difference between the schematic in the Handbook (must be the new one because my '91 is correct in this regard) on the connection around the 422/562 and 1K resistors in front of U4 pin 5.

If you find other problems, let me know and I'll try to include them in this file.

Glenn n6gn