[TowerTalk] Tune 160/80 Vertical

[Tom Osborne]

I had a friend who had a setup something like this and he used an old 12v
hand-held drill to turn the cap.  He bought it at a flea market without a
battery, super cheap.  He used a 12 supply to power the drill and turn the
cap.

Worked really good and was easy to set up.  73
tom W7WHY


On Mon, Feb 29, 2016 at 10:46 PM, Jim Brown <jim at audiosystemsgroup.com>
wrote:

> I really like the method Jim outlined here -- I've been using it on my Tee
> vertical ever since I moved to W6 ten years ago!  I use a parallel
> combination of small doorknob caps to tune it.
>
> 73, Jim K9YC
>
> On Sat,11/20/2010 6:51 PM, Jim Thomson wrote:
>
>> ##  Install  a  capacitor in series with the feedpoint of the vertical,
>> right at the base. Make the horizontal wire long enough, so the resistive
>> component is  50-60 ohms on the freq you are interested in.  At that point
>> you will have some XL.   Then tweak the cap  so the Xc of the cap  will
>> cancel out the XL  on 160m.  Presto, flat swr on 160m.    On 80m, the cap
>> has to be shorted out.  No big deal with a suitable spst relay.
>> A buddy used a motor driven  2500 pf cap... and a 100' tall  vertical,
>> with an inverted vee type capacity hat on top.   This entire mess  was
>> suspended on a catenary line, between 2 x trees.  It's flat swr across the
>> entire 200 khz.
>> Note, on some vac caps, they have a feature on em, whereby when the cap
>> is fully meshed, and then some, the plates  will  short out.   This saves
>> you having to install a relay across the cap, in cases where you want it
>> shorted out.... as in your dual band set up.
>>
>>
>>
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