[600MRG] Automatic Antenna Tuning

[Brian L. Pease]

I have a 1000pf vacuum variable I am driving with a 5 rpm 12V gearhead 
motor from mpja.com.  I am currently using it on 160m, but soon on 
630m.  The overshoot is not bad even at full 12V & way more power than 
needed.  The motor only draws about 50mA.   A simple spring loaded 
switch and SWR meter allow touch-up tuning in the shack. 

On Thu, 15 Dec 2016 08:37:54 -0600, John Langridge  wrote:

       Paul,

Many of us are using motor-driven variometers and shunt elements to manage
impedance excursions or QSY up and and down the band. 

As far as automatic antenna tuners are concerned, Eric, NO3M / WG2XJM,
built an arduino-based system a few years ago, probably sampling voltage
and current on the line ala the scope match and making decisions about what
direction to move the drive motor for the best match. I don't know if he
is still using it with his new system but it gave him the flexibility that
you are seeking... 

73!

John KB5NJD / WG2XIQ.. 

On Thu, Dec 15, 2016 at 7:40 AM, Paul Signorelli  wrote:

> Has anyone found an easy way to do Automatic Antenna Tuning. 
>
> My antenna will swing 5 kHz over a cold winter nights nap. 
>
> I am sure it is the trees which it is hung in. 
>
> Has anyone made an automatic or semiautomatic system to trim out those
> variations?
>
> Thermostats, etc?
>
> I have to go out side and change an antenna tap. 
>
> I think I will just install a switch, maybe a remote switch. 
>
> Paul wa2xrm
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