[Elecraft] 43' Vertical and the K2 tuner

[Vic K2VCO]

Steve Ellington wrote:
> Back to the original question about using the K2's or K3's tuner on this 
> antenna....Figure 4. in that link shows the impedance of the antenna to be 
> less than 10 ohms below 5 mHz and around 1 ohm on 160M. Factor the  1:4 
> balun in and that divides the Z by 4. So we end up with an impedance of less 
> than 2 ohms presented to the K2's tuner. Open the windows and let the smoke 
> out please.

I modeled a plain 43' vertical in EZNEC. Fed with 50-ohm line, the SWR on 40 meters is a 
bit less than 10:1; on 80 it's nearly 100:1. (11.1 - j232). It would be a dummy load on 
80. Some of these  antennas (like the Array Solutions mentioned) include baluns or 
transformers. My guess is that the large amount of reactance would increase losses in such 
a device.

A tuner at the base would be the way to go. But keep in mind that you still need a good 
local ground system as well as decent ground conductivity within a few wavelengths for 
reasonable performance.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco