Sri, posted to wrong list.
NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@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@qth.com [mailto:Force12Talk-bounces@qth.com] On
Behalf Of w3yy@cox.net
Sent: Tuesday, July 19, 2005 12:15 PM
To: George Polonski; Force12Talk@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@midcanadamod.com>
> Date: 2005/07/19 Tue PM 12:39:26 EDT
> To: <Force12Talk@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
>
> _______________________________________________
> Force12Talk mailing list provided as a service by Force 12 Antennas, Inc.
> Force12 Web Site: http://www.force12inc.com
>
> To Submit Message to the List: Force12Talk@qth.com List Help:
> http://mail.qth.com/mailman/listinfo/force12talk_qth.com
>
_______________________________________________
Force12Talk mailing list provided as a service by Force 12 Antennas, Inc.
Force12 Web Site: http://www.force12inc.com
To Submit Message to the List: Force12Talk@qth.com List Help:
http://mail.qth.com/mailman/listinfo/force12talk_qth.com
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|