Control of Screwdriver Antenna

[Mark Goldberg]

Some years ago, there was a discussion of using the KX3 to control a
screwdriver antenna. Send a tune signal, measure the SWR, move the antenna,
step and repeat. Has anything come of that? Signal buffering would be
needed. I have had good luck with an h bridge motor driver based on the
irf3205 that are sold for robotics.

73,

Mark
W7MLG
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[David Shoaf]

You can make one yourself with a bridge motor controller and some sort of
Arduino.  You can then program it using the KX3 Programmers Reference.

Or, you can check out the TuneMatic products from JT Communications.  He's
already done the work and it works with the KX3 standing along or with the
KX3/KXPA100 combo for mobile applications.   Tarheel Antennas also resells
this controller.

I'm sure there are others but I see Jim Trapani (JT Communications) in a
booth at the hamfests.

Cheers,

David/KG6IRW



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