Topband: My Inverted L

[Dan Simmonds]

Hi Dave,

I suspect your problem is similar to my initial 160m Inverted L 
installation - that being the part about your radiator sloping down to 
25'. Due to problems very similar to yours, I eliminated any downward 
slope I had initially, and made the whole thing horizontal to the earth, 
and things (minimum SWR and bandwidth) improved a great deal. I realize 
this is easier said than done in a lot of cases - maybe you can tie off 
to a distant tree? Right now, my Inverted L is tied off to a tall tree 
at the back edge of my 12 acre field - some 300 feet+ from the feedpoint 
with a lot of darcon rope.

Dan  KK3AN



Dave Novoa W4DN wrote:
> I built an Inverted L for160 meters following K2AV's  intructions for 
> the FCP, using the Balun Designs' isolation tranformer.  It resonates 
> around 1813 kHz  (that's OK with me) but the SWR is 1.9:1 minimum, 
> which my Yaesu Quadra amplifier does not like.   The feed point is at 
> 8.5' high, 25' away from the tower. The antenna wire,  from DX 
> Engineering, runs up to about 67',  then slopes down to about 25'.  
> There is a 4 element 20-meter Cushcraft yagi about 3' above the apex 
> of the wire on a 70' crank-up tower. What could be the problem that 
> causes the high SWR?  Any advice is apreciated.
> 73,
> Dave, W4DN
>
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