[TowerTalk] [Force 12 Talk] 340N

[Keith Dutson]

Sri, posted to wrong list.

NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Keith Dutson
Sent: Tuesday, July 19, 2005 1:10 PM
To: Towertalk
Subject: Re: [TowerTalk] [Force 12 Talk] 340N

Re-check your model.  My 40M 2el antenna resonance went up 12KHz when moving
from 20 to 150 feet.

73, Keith NM5G

-----Original Message-----
From: Force12Talk-bounces at qth.com [mailto:Force12Talk-bounces at qth.com] On
Behalf Of w3yy at cox.net
Sent: Tuesday, July 19, 2005 12:15 PM
To: George Polonski; Force12Talk at qth.com
Subject: Re: [Force 12 Talk] 340N

George -

I'm not a modeling expert, so take the following with a grain of salt.
Using YO and the 3 el 40 meter beam model contained therein, the minmum SWR
point was 7175 at an antenna height of 25ft and about 7160 at an antenna
height of 75ft.  It moved down about 15kHz.

I think I know why you're asking the question, having put up a 240N last
year, but I can't remember how the resonant frequency changed between 30ft
and, in my case, 120ft.  I'll try to dig up my notes and let you know.

73, Bob - W3YY
  
> 
> From: "George Polonski" <George at midcanadamod.com>
> Date: 2005/07/19 Tue PM 12:39:26 EDT
> To: <Force12Talk at qth.com>
> Subject: [Force 12 Talk] 340N
> 
> Can anybody advise me what would be frequency up shift for 340N rising 
> antenna from 25 to 75 feet ? (Over average ground) 73, George VA3EF
> 
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