Topband: Inverted-L Help

Herb Schoenbohm herbs at surfvi.com
Mon Apr 5 06:17:34 PDT 2010


Joe Dubeck wrote:
> I know it's the wrong time of the year but I'm about to become a
> newbie on 160 and plan to erect an Inverted-L transmit antenna of
> the side of my 120' tower, primarily to work DX.
>
>  
>
>
>   

Forget about the cloud warming Inverted "L" hanging of you tall tower as you have plenty of top loading to make the tower with the beams on top to provide an excellent 1/4 plus radiator.  A three wire cage is preferred but a single shunt wire of #8 wire spaced 24 inches and dropped to the ground (some hams used discard CATV cable with a large diameter than the single wire) can be tuned with a single series capacitor if you have a tap point that shows close to 50 ohms and has some inductive reactance to tune out.  This is a far better solution as the horizontal "L' wire will not bet there to interfere with your beams pattern.

Before you look for the sweet point on the shunt feed put down some 
radials, even 4 to 8 60 footers would be better than none.


Herb, KV4FZ



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