Agreed, HFTA is the way to go. ARRL Antenna Handbook ed 21 includes the
software and instrustrutions you will need. A little hand held GPS will give
you your tower location, and a fair bit of determination for the novice,
will give you a great picture of what you have to work with.
Gene / W2LU
----- Original Message -----
From: "Dick Dievendorff" <dieven@comcast.net>
To: "'Jim Lux'" <jimlux@earthlink.net>; <towertalk@contesting.com>
Sent: Wednesday, November 30, 2011 8:25 PM
Subject: Re: [TowerTalk] Determine cost-effective tower height
>I think HFTA is by Dean Straw, N6BV. In any case, it's the program you
>want
> for this. Ward edited the new Antenna Book, and included Dean's programs.
>
> Dick, K6KR
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Lux
> Sent: Wednesday, November 30, 2011 5:00 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Determine cost-effective tower height
>
> On 11/30/11 4:47 PM, Andreas Hofmann wrote:
>> Hi,
>>
>> I have decided I need a tower to get better antennas up in the air.
> Thinking about the SteppIR DB 18, 40m 2 el, 20 and up 3el. Now, my
> property
> slopes pretty much in every direction by 5 degrees. I need to determine a
> proper tower height without breaking the bank.
>>
>> I was told I should run a computer program to figure a good height of the
> yagi for my most important directions/DX locations. In fact a friend of
> mine did the same (on a similarly sloping property) and he found out that
> a
> 55 foot tower would be similar to a 120 foot tower on a flat ground.
> Hence
> he put up a 55 foot crank up mast and it is rocking. He forgot the
> program
> he used.
>>
>> So, what tool can I use to find the optimal (not maximal) height of a
> tower that would work well here?
>> Also, the tower would be setting on the side of the house with a metal
> roof (roof about 15 feet high), not sure if this would matter...
>>
>> Thanks
>> Andreas
>> KU7T
>>
>
> HFTA by Ward Silver which comes with the ARRL Antenna Book is what you
> want.
> You enter in the surrounding terrain (or extract it from DEM files, etc.)
> and it calculates the pattern.
>
> Only works for horizontally polarized antennas, by the way.
> _______________________________________________
>
>
>
> _______________________________________________
> 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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|