[TowerTalk] 80M antenna wire size

[Jim Brown]

This is exactly what I've done since moving here in 2006. In NEC, I 
tweaked the length of the horizontal top of the Tee to achieve that 50 
+jX value at the center of my operating range, computed the series C 
value to tune out that jX, then added parallel caps with low values of 
series R to hit that value. The same technique would be used for an L.

73, Jim K9YC

On 1/7/2020 11:06 AM, Paul Christensen wrote:
> My 160m T is 100 ft high with an 80 ft. flat top.  Next season, the flat-top will increase to 120 ft. where RF current magnitude is uniform across the entire radiator length with a slight current peak half-way up.
> 
> I initially selected an 80 ft top because it made matching super easy.  The base Z is 50+j200 and only requires a series capacitor to achieve a 1:1 SWR.  The series cap will be replaced by a low-pass L network as the R value is expected to rise up to about 65 ohms.  Resonance presently occurs at 1500 kHz but will shift down to 1400 kHz when the flat-top length increases.  Easy to match with a low-pass L network.