User Guide

( ) Connect the BLACK wire from the SK-201 circuit board to the grounded lug of the 2-lug

terminal strip (installed earlier) and solder.

( ) Connect the YELLOW wire from the SK-201 circuit board to the insulated lug of the 2-lug

terminal strip and solder (along with the 33Ω 1W resistor).

( ) Connect the BLUE wire from the SK-201 circuit board to the antenna relay jack on the rear

panel and solder (along with the 0.02µF capacitor).

( ) On the terminal strip to the left of terminal strip “Q”, locate the junction of the rectifier diode

and the 10KΩ 2W resistor. Connect the RED wire from the SK-201 circuit board to this

junction and solder.

( ) Fish the GREEN wire from the SK-201 circuit board under the capacitor going between

terminal strip “Q” and the terminal strip to the left, over the wire bundle and through the

grommet in front of the SW R bridge assembly.

( ) Rotate the chassis onto its side with the transformer down. Pull the GREEN wire all the

way through the grommet so that it reaches one of the terminal lugs where the filament

choke is soldered. Solder the GREEN wire to one of the lugs where the filament choke is

attached.

( ) Reinstall the tubes and the perforated sheet metal RF shield on the top of the chassis and

put the chassis back into the case.

This completes the installation of the SK-201 “Soft Key” module. You may not SEE any

difference in the operation of your exciter or amplifier, but you will know that you have reduced the

stress on the exciter’s keying relay by many orders of magnitude.