Sorry for pictures’ quality – they were taken
by my cell-phone. The design
of the key is simple, see Figure 1.
Three copper areas are cut on a small PC- board. Two upper ones
are for ‘dot- dash,’ rest below is ‘ground.’ Copper strips with
thickness in 0.5 mm are soldered to each dot- dash area,
a metal end from a glass fuse is soldered to the ground area.
Plastic buttons (special dash pots used at furniture) are glued
to the copper strips. The PC board is placed to a little nice
black box made from a metal.
The box with key board inside the one is fastened
by a screw to transceiver’s push-to-talk switch. The screw is
screwed instead a screw (too much ‘screws in one sentence!) that
early was hold a clip. The push-to-talk switch has not flat surface,
so a pillow made of polyurethane is placed under the ‘black box.’
Key wires are into push-to-talk switch cable.
While QSO the push-to-talk switch is in the
left hand, by the hand do turn RX/TX, keying do by the right hand.