I am thinking about making my GS35B amp project autotune. A
microprosessor circuit will remember the correct tune settings for
each band (C1, L, C2) and when I switch bands the amp will tune
itselves to presets that had been previously programmed. I have got
hold of two nice big vacuum variable capacitors, that will be
actuated with stepper motors via pulleys (some gearing / reduction) or
via motors that have a gearbox.
The question is how to implement the PI or PI-L coil switching.
Several of the rugged swithces that are in use on manual tune amps are
quite hard to rotate and needs to "snap" into contact engagement. I
suspect those are not easy to actuate properly via a motor / gear
system.
I have been thinking about different options:
-Several vacuum relays that are electronically controlled from a
control board (will the added capacitance of the body / wiring be a
problem?). Has a solution like this been attempted before by anyone on
this list?
-Normal relays that are electronically controlled from a control board
(will the added capacitance of the body / wiring be a problem?) Has a
solution like this been attempted before by anyone on this list?
-A special switch that is designed for "motor actuation" (Where do I
get hold of that and is the cost prohibitive?) Has a solution like
this been attempted before by anyone on this list?
Are there other ways that has been tested in practice to implement
this? (Apart from a roller coil with a motor / gearbox on it of
course).
73
LB3HC
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|