My "guess" is that you could probably estimate
the performance using the antenna at 1/4 above
a really good ground!
73 - Mac, K2GKK/5
Since 30 Nov 1953
Oklahoma City, OK
USAF (Retired) 61-81
FAA (Retired) 94-10
________________________________
From: RFI <rfi-bounces+k2gkk=hotmail.com@contesting.com> on behalf of David
Eckhardt <davearea51a@gmail.com>
Sent: Sunday, March 21, 2021 16:28
To: John Altman <wa4aip@gmail.com>
Cc: Rfi List <RFI@contesting.com>
Subject: Re: [RFI] Tin roof
We have a steel roof. It's In sections about 2-feet wide and long 40 to 50
feet long. I was a bit concerned about noise in a good wind (which we
regularly get!). No problem. And it makes a wonderful mounting surface
for magnetic mount VHF/UHF antennas.
A 1/2-wavelength at 14.150 MHz is about 35-feet. If the antenna is at
50-feet and the height of the new structure is about 10-feet, that would
put the tin roof 40-feet from the antenna. This is a bit over
1/2-wavelength. Without modelling, I'd guess the impact of the conducting
roof will be minimal.
Dave - WØLEV
On Sun, Mar 21, 2021 at 8:09 PM John Altman <wa4aip@gmail.com> wrote:
> Dave and Mike, thank you for your comments.
>
> It is my brothers project, he is building a dedicated structure for his
> shack. He uses a 20-10 yagi, balun at the antenna, RG8 coax, generally
> barefoot, occasionally kicking in a 500w tube amp. I am helping him with
> shack and tower grounding layout.
>
> He has a Hustler 4BTV vertical which will be located some 50 feet from the
> shack. It can be relocated if necessary.
>
> My feeling are that there would probably be little pattern distortion and
> the proper grounding systems should eliminate any shack RFI. I had thought
> of the EXNEC modeling.
>
> In summary, I have never had to contend with a tin roof scenario thus, the
> question to the group.
>
> Thanks again,
>
> John
> WA4AIP
> ARRL Charter Life Member
> 50 Years HAMMING!
>
>
> Sent from my iPad PRO
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--
*Dave - WØLEV*
*Just Let Darwin Work*
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