ts820.1

1. Solid state conversion to change keying voltage at the CW 
key kack from -65V to +4.4V. See QST Dec. 1983 pg. 39 for schematic.

2. Schottky diodes improve product detector. QST Oct. 1987 pg. 37.

3. WARC bands for the TS-820(S). See QST Feb. 1983 pg. 36.

4. MOD to allow CW using either filter position after addition of 
   500 hertz filter. See 73 Magazine April 1980 pg. 70.