[TowerTalk] Unique Shunt-Feed Tower question

[David Gilbert]

I've never tried this but I have often wondered the same thing.  A wire 
running down the outside of the tower basically just forms a shorted 
parallel wire transmission line along with a portion of the tower, 
albeit with conductors of obviously dissimilar diameter.  A wire INSIDE 
the tower would simply be a coaxial transmission line and although the 
characteristic impedance would be different (and therefore the 
attachment point might be different), the basic principle should be the 
same.

73,
Dave   AB7E



On 9/15/2021 10:08 PM, RVZ via TowerTalk wrote:
> Hi Guys,
>
> Wondering if anyone has had success on 80 or 160m. by Shunt Feeding a Self-Supporting Tower by installing the shunt wire through the center of the tower?   I want to try this inside the tower feed system on my 120' Self-Supporting Pi-Rod tower.  My tower has a face width of 5' at the bottom and 2' at the top.  Not much top loading at this time, just a chrome moly pipe extending 14' out the top of the tower for an overall height of 134' and a Cushcraft Shorty-Forty mounted 2' above the tower at 122'. All ideas and suggestions for this "inside the tower Shunt Feed system" are welcome and appreciated. Thank You!  Dick- K9OM