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[Towertalk] remote controlling a cap

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Subject: [Towertalk] remote controlling a cap
From: (Chris BONDE)
Date: Fri, 14 Jun 2002 16:35:45 -0700
 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
> 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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> >
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