[Elecraft] Motor for Cap in Mag Loop

[Morgan Bailey]

A stepper motor or a cheap 12 volt servo motor with a 1 to 2 rpm turn rate
hooked up with a 5 dollar circuit board that pulses the dc to the motor.
All can be had on ebay for about 40 dollars.

additionally, insulate the motor shaft from the cap shaft and mount in
plastic because the rf will mess with things. Use beads on the leads to the
motor. An antena company in Italy will send you the butterfly cap and the
controller for about 300 dollars and it is already wired and ready for a
loop. They make square loop antennas but you can buy any thing they sell
and that is the easiest way to do it and it is pretty bomb proof.

It will allow you to be away from the antenna and not near any RF. They
have the best system that is pre-fabed. Here is the link.

http://www.dolstra.nl/Antennes/HF/Magnetic%20loop/
INAC%20Loops/Inac_loops.htm

You can get the direct order from Inac from googling it.

Vy 73,

Morgan Bailey NJ8M

On Thu, Oct 27, 2016 at 10:22 PM, Morgan Bailey <mbaileycrna at gmail.com>
wrote:

> A stepper motor or a cheap 12 volt servo motor with a 1 to 2 rpm turn rate
> hooked up with a 5 dollar circuit board that pulses the dc to the motor.
> All can be had on ebay for about 40 dollars.
>
> additionally, insulate the motor shaft from the cap shaft and mount in
> plastic because the rf will mess with things. Use beads on the leads to the
> motor. An antena company in Italy will send you the butterfly cap and the
> controller for about 300 dollars and it is already wired and ready for a
> loop. They make square loop antennas but you can buy any thing they sell
> and that is the easiest way to do it and it is pretty bomb proof.
>
> It will allow you to be away from the antenna and not near any RF. They
> have the best system that is pre-fabed. Here is the link.
>
> http://www.dolstra.nl/Antennes/HF/Magnetic%20loop/
> INAC%20Loops/Inac_loops.htm
>
> You can get the direct order from Inac from googling it.
>
> Vy 73,
>
> Morgan Bailey NJ8M
>
>
>
> On Thu, Oct 27, 2016 at 9:06 PM, johnpierce <ja-pierce at verizon.net> wrote:
>
>> I have seen general definitions about motors for driving a capacitor in
>> Mag
>> Loop.   But I have not seen a recommendation of a specific type to look
>> for
>> on Amazon or Ebay.  For starters I am looking for a 12vdc reversible
>> motor.
>> I would like to start with a simple push button system for tuning.  Maybe
>> I
>> will consider a stepper later.  I think that would need some computer
>> control.  I am also wondering what RPM to consider for use on the lowest
>> frequency (40mtrs).  The capacitor I am expecting to use would not have a
>> stop and could travel a full 360 degrees.
>>
>>
>>
>> John
>>
>> Ad2F
>>
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>
>