WB4KDI Engineering Notebook

Adjustable Sidetone Pitch

Musical ear? Can't hear the sidetone anymore? Replace a resistor to ground with a 50k ohm trim pot. Then the sidetone can be adjusted slightly up or down in frequency.

TS-120S

, R77 The trimpot stands on stiff leads above the other components.

The adjustment for the cw offset is on the VFO.

TS-120 VFO
VFO-120 / TS-130 VFO

TS-430S

, R153 The trimpot stands on stiff leads above the other components.

The adjustment for the cw offset is VR1 on the control board. The adjustment is very touchy.

TS-450S

of IF board, R8