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
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