[TowerTalk] 80 meter vertical or

[Gary Johnson]

I’m using half-slopers for 80 and 160 on a too-short tower. Simulation and experiment shows that the feed point height determines the resistance at resonance, while the wire length determines the resonant frequency. It’s not quite orthogonal tuning but close enough. I adjusted the 80m one for roughly 70 ohms at 3670, then used the W4RNL-N6NL broadband coax trick to get a decent match over the entire 80m band.

Gary Johnson NA6O  
gwj at me.com

> From: <marko.n5zo at gmail.com>
> 
>  I could never  get the
> sloping wire to tune, so I'm sure there is some interference from tower as
> sections are not so clearly connected.