Step 1: Remove the MICOR power amplifier PC Board and discard. It is not tunable to 220MHz. Save all hardware.

Step 2: Unsolder the wires from the Positive feedthrough capacitor and unscrew it from the casting.

Step 3: Install the Positive feed through capacitor in the hole next to the negative feedthrough.

Step 4: Re-connect the positive wire and filter cap to the feedthrough.

Step 5: Construct the Toshiba power module based amplifier per the schematic. (fig 6). Mount the module to a 3/16" thick X 3 ½" X 5" aluminum plate where the original PA board was mounted (Fig. 8). Use heat sink compound between the module and plate, and between the plate and casting.

Step 6: Wire the PA to the Exciter output, +12V, Gnd., and to the Harmonic filter.

Step 7: Wire the Blue power control wire to the Base of the pass transistor. (Mounted where the old PA board Pass transistor was with new insulators etc)

Comments or submissions for publication can be sent to muldoon@seits.org.