[TowerTalk] LPDA optimal height

[Guy Olinger]

It's not the tools that are band-specific. The reflection formed vertical
pattern is band specific. You are defeated in this by the laws of physics.
Some partially solve this dilemma with stacks. Stacks ideally are single
band solutions, but doing it with multiband antennas at least gives you a
choice of heights.

73, Guy K2AV

On Mon, Feb 13, 2017 at 7:06 PM, Jeff AC0C <keepwalking188 at ac0c.com> wrote:

> I’m considering putting up an LPDA this summer to augment the existing
> stuff.  The LPDA would serve two purposes:
>
> 1. 30m/17m/12m DX chasing.   I suppose that really means 30/17 as I can’t
> remember the last really solid 12m opening...
>
> 2. Fixed-on-SA for 20/15/10m when contesting.
>
> The problem is the usual tools for helping on height (HFTA) are more or
> less band specific so what is the best height on (for example 20m into SA)
> is not really a great height for another equally important (e.g. 30m DX
> into eastern side of EU).   In playing around with HFTA clearly each height
> seems to provide some benefit over another.  Higher band and higher height
> gives more nulls but better low angle performance.
>
> I figured that something around 80-100’ overall but would greatly
> appreciate any suggestions...
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
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