This is why people stack antennas. There is no ONE sweet spot. 100' is almost
too high for 10m but perfect for 30m. I say put it up, if you already have the
tower.
I'm planning my own installation. I have three crank up towers: 106', 89', and
70'. The Steppir DB-36, which has three ele on 40m (6-40m) will go on the 106',
a smaller Steppir on the 89' and a dedicated 6/10m antenna on 70'. I figure
this will give me good, all around coverage.
I can also vary the height on towers, if I'm aiming at any specific target.
Crank up is the way to go, unless you have stacked antennas.
Good luck.
Ed NI6S
> On Feb 14, 2017, at 03:06, Jeff AC0C <keepwalking188@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
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|