Date: Thu, 24 Oct 2013 09:23:28 -0700
From: Larry Loen <lwloen@gmail.com>
To: jim@audiosystemsgroup.com
Cc: TowerTalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Tower and antenna decisions
### 50 feet beats out 34 feet hands down every time. 67 feet
beats out 48 feet every time too. Be careful about the TA program.
It assumes you are in the middle of a wheat field in Kansas. In urban
locations, height is everything. New homes on my street are very high,
like 29-32 foot. Utility poles across the street are 40 foot high...then the
12.5 kv line is 1.5 ft above that. Some of these homes are stucco..with
well grounded mesh below the surface. Toss in attic wiring, misc trees..etc,
and 45 ft will just barely clear any of this crap..and by only 3.5 feet.
## Ask anybody with a motorized 89 ft crank up.
## Higher is better, end of story.
Jim VE7RF
I hear you. And contesters with stacked arrays agree with you.
But, I remain suspicious that, on average, height wins out. This
situation, after all, has one individual picking between one height or
another more or less permanently.
I'm still hearing, and working, way too much off the side of the antenna
(versus the Windom) to not think height has a lot to do with it, on average.
I would lean towards the smaller antenna, higher.
Larry WO7R
On Thu, Oct 24, 2013 at 9:07 AM, Jim Brown <jim@audiosystemsgroup.com>wrote:
> On 10/24/2013 8:37 AM, Larry Loen wrote:
>
>> I know that stations are way down to inaudible on my Windom at 43 feet.
>> Height is worth_a lot_.
>>
>
> I wouldn't attribute all of that to height -- what you can HEAR is
> primarily the result of antenna directivity and noise rejection. Windoms
> are notoriously bad for noise rejection, because they are badly unbalanced,
> so noise picked up on the transmission line couples to the antenna.
> Windoms also have "random" directivity on each band.
>
> Also, it's worth studying N6BV's excellent work on High Frequency Terrain
> Analysis in the ARRL Antenna Book, and also modeling in NEC. Higher is not
> always better.
>
>
> 73, Jim K9YC
> ______________________________**_________________
>
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|