[Towertalk] remote controlling a cap

[VE6WZ]

Many transmitting variables are "continuously rotatable"...ie. no stop.
If you have, or can get one of these there is no worry about hitting the end
when driving it with a motor.

de steve VE6WZ.

----- Original Message -----
From: "Richard M. Gillingham" <rmoodyg@concentric.net>
To: "Chris BONDE" <ve7hcb@rac.ca>
Cc: "WA2BPE" <wa2bpe@infoblvd.net>; <ken.claerbout@equant.com>;
<Towertalk@contesting.com>
Sent: Friday, June 14, 2002 5:02 PM
Subject: Re: [Towertalk] remote controlling a cap


> I think most screwdriver antennas are tough enough to stall the
> screwdriver motor without breaking anything.  I doubt the cap is as
> strong.  Try and see, if you've got either more caps or more
> screwerivers.  ;->
>
> 73
> Gil
> W1RG
>
> Chris BONDE wrote:
>
> > From what I understand the "screwdriver" antenna uses the portable
> > screwdriver.  The circuit should be the same as needed for caps.  I
> > have not found the circuit  with the limit switches but if it works
> > for the antenna why not for caps??
> > Chris opr VE7HCB
> >
> >
> > At 12:36 PM 2002-06-14 -0400, WA2BPE wrote:
> >
> >> I am in the process of setting up this exact thing to remotely adjust
> >> a tuner
> >> using multiple screwdrivers and a simple NTSC video camera/monitor to
> >> monitor
> >> the settings - KISS approach.  It would be best to remove the
> >> batteries and
> >> use an appropriate supply..  Also, some RFI filtering will be needed
> >> - like a
> >> 0.01 across the motor terminals.  It is probably a good idea to set
> >> up some
> >> limit switches to avoid any chance of crunching the cap, etc.
> >> Steppers are
> >> great and are best for an automated system, but the drive circuitry is
> >> considerably more complex.
> >>
> >> 73,  Tom - WA2BPE
> >>
> >> ken.claerbout@equant.com wrote:
> >>
> >> >   Hi Howard - I have a small cordless screwdriver which I think is
> >> made by
> >> > Black & Decker.  I see them for sale at Home Depot for around $15.
> >> It's
> >> > cylindrical in nature and about 10" long.  I often thought
> >> something like
> >> > that might work well to remotely tune a capacitor or inductor.  You
> >> could
> >> > easily connect the shaft of the screwdriver to the shaft of the
> >> cap.  It
> >> > offers plenty of torque.  The switch on the screwdriver could
> >> easily be
> >> > remoted back to the shack and about the only other thing, is
> >> providing it
> >> > with a DC source so it doesn't have to run off of batteries.  Just a
> >> > thought.
> >> >
> >> > 73
> >> > Ken K4ZW
> >> >
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