|[AMRadio] Dual concentric pot needed|
k4kyv at charter.net
Thu Sep 6 13:05:04 EDT 2007
> I'm looking for a dual, concentric (2 shafts) panel bushing mount
> potentiometer with 10k and 500k sections, preferably with a on/off switch
> on the rear.
> This is to replace the AF/RF-gain controls in a Multi-Elmac PMR-7
> Anyone have something that would do the job?
> Steve WD8DAS
I assume the 500k pot is for the AF gain control. You will need to make
sure that pot is logarithmic, or audio taper. If it is linear taper, 95% of
the control of the volume will take place over about the first 20% of the
rotation, and the rest will have little noticeable effect. This is because
the perception of loudness by the human ear is a logarithmic, not a linear,
function of the amplitude of the sound.
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