Re: [TowerTalk] Stacked 4 El SteppIR's

["Howard Klein" <howk2@hotmail.com>]

Bob,
I have done it with the 3 el SteppIR's. Haven't had a chance to do it yet 
with the 4 el. Too busy getting  it up and working in the real world and and 
have been out of town for a few days with no modeling program available. 
Perhaps I was too simplistic with my previous quick reply. There are some  
problems  converting the physical dimensions into the electrical lengths 
otherwise it is  straight forward. The SteppIR is easier than most Yagis 
since instead of tapered aluminum elements they are a consistant diameter. 
Trapped antennas and intertwined elements are much more  difficult. The 
other problem (?),  once results are obtained say for maximum gain or 
whichever you wish to optimize,  is how to measure it on YOUR tower. 
However, the data  is a good starting point. The folks at Fluid Motion have 
supplied me with dimensions for several representitive frequencies optimized 
for gain, front to back, and a middle road compromise. Since they have 
tested these dimensions on an antenna range it makes for a tempting place to 
begin. With this information I will model for optimization with a two stack. 
Ultimately I will test (in a crude manner) for actual patterns. Hope this is 
some help.
73,
Howard..K2HK


----Original Message Follows----
From: Robert Shauger <rgshauger@myyellowstone.net>
To: k2hk@arrl.net
CC: towertalk@contesting.com
Subject: Re: [TowerTalk] Stacked 4 El SteppIR's
Date: Fri, 12 Sep 2003 00:40:08 -0700

Has anybody actually done a modeling profile of the SteppIR yagi antennas?
It might be a eye opener to see the modeling results.

Bob - AI7M


----- Original Message -----
From: "Howard Klein" <howk2@hotmail.com>
To: <rgshauger@myyellowstone.net>
Cc: <towertalk@contesting.com>
Sent: Thursday, September 11, 2003 2:16 PM
Subject: Re: [TowerTalk] Stacked 4 El SteppIR's


> ABSOLUTELY. Pretty straight forward especially compared to a tribander.
> Howard...K2HK
>
>
> ----Original Message Follows----
> From: Robert Shauger <rgshauger@myyellowstone.net>
> To: k2hk@arrl.net, kg6i@direcway.com
> CC: towertalk@contesting.com
> Subject: Re: [TowerTalk] Stacked 4 El SteppIR's
> Date: Thu, 11 Sep 2003 13:09:24 -0700
>
> Is it possible to do a gain and front to back modeling of the SteppRI
> antennas?  Has it been ever been done?
>
> Thanks,
> Bob - AI7M
>
>
> ----- Original Message -----
> From: "Howard Klein" <howk2@hotmail.com>
> To: <kg6i@direcway.com>
> Cc: <towertalk@contesting.com>
> Sent: Thursday, September 11, 2003 12:28 PM
> Subject: [TowerTalk] Stacked 4 El SteppIR's
>
>
 Hi John,
Right you are.  I am out of town and forgot the exact boom picture. I
know I was not very disturbed over the boom specs. I actually got my 2nd 4 
el
up  Sunday but before I had time to tune the pair I had to leave town. I
can  only say I am extremmely impressed with the top 4 at 75 ft. The lower
at  40ft (right now) sounds pretty good also. I need to play with the  
separation
and tune the individual antennas when I get home to see how the stack
will  work. It's hard to believe that it can only get better. Good luck 
John.
73,
>  > Howard..K2HK

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