I agree that the two books would be nice to have (if you don't?) but I doubt
if they will be of much help in your case. There are just too many
variables. I suggest getting an antenna modeling program and even then it
will take many, many model length and frequency variations. Also be sure to
obtain a modeling program that will allow enough segments to cover your 1
1/2 mile length.
For example: EZNEC reports that your antenna would have a gain of about 8
dbi on 160 at an elevation angle around 12 degrees. Very good but the
azimuth beamwidth is also about 12 degrees and the gain falls off
drastically in other directions both in azimuth and elevation.
At 14 mhz, EZNEC reports a gain of about 18 dbi(!) at an elevation angle of
around 5 degrees. However the 3 db azimuth beamwidth is 6 degrees and the
gain falls off at least 10 dbi beyond that.
It would seem fun to model but also fun to get on the air with it end fed.
k7puc
----- Original Message -----
From: "Richards" <jruing@ameritech.net>
To: <n8de@thepoint.net>
Cc: <Michael.Kincaid@l-3com.com>; <towertalk@contesting.com>
Sent: Thursday, February 26, 2009 9:29 PM
Subject: Re: [TowerTalk] Power poles as antenna supports
>
> I take it you are going to inherit the LAND *and* and
> POLES... or just the Poles? Your post is not clear.
>
> But it may cost you like $200 - $500 per pole to have them
> re-installed and maybe more depending on the cost to remove
> them first. I agree you should only remove the farthest first and
> see if you can use the others closer where they are - maybe for
> a beverage receiving antenna. Maybe for multiple options.
>
> I strongly suggest you get and read the ARRL Antenna Handbook
> and study up ALL the different things you can do with such an
> arrangement. Maybe get On4UN's Low Band DX-ing book with
> lots of good antenna ideas.
>
> This is a great opportunity - not only to build - but to learn what
> to build, as well.
>
> Take your time and see what you can do first.
>
> ================= Richards - K8JHR ==================
>
>
> n8de@thepoint.net wrote:
>
>> Wow .. what an opportunity.
>>
>> The possibility of moving the FARTHEST poles to your 'yard' for yagis
>> is good, but I'd use an open-wire feedline and attach it directly to
>> the near end of that LW.
>
>
> ===================================================
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> --
> No virus found in this incoming message.
> Checked by AVG.
> Version: 7.5.557 / Virus Database: 270.11.3/1974 - Release Date: 2/26/2009
> 2:51 PM
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|