[Towertalk] remote controlling a cap

[Richard M. Gillingham]

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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