[TowerTalk] Cutting a dipole

[Bob K6UJ]

FWIW I have never had good results trying to calculate the difference in resonant freq from low heights vs the desired height on an inverted V.
I finally reached the conclusion it was a waste of time to try and calculate the difference.  
Hoist the center up to its final height and leave a generous amount on the ends and lower and raise each of the ends and keep pruning till you get nirvana.

Bob
K6UJ




Onp 4, 2013, at 5:42 PM, Wes Attaway (N5WA) wrote:

> Why not use EZNEC or similar program to model the dipole at 8' straight
> across and then at the 65'apex with whatever the height of the ends are?
> 
> This should give you a good idea of what to expect.
> 
> You should be able to determine how to cut the dipole while it is at 8' so
> that it will be close to what you want when you raise the apex.
> 
> 
> ----------------- Wes Attaway (N5WA) ------------------- 
> 1138 Waters Edge Circle, Shreveport, LA 71106 
>    318-797-4972 (Office) - 318-393-3289 (Cell) 
>        Computer Consulting and Forensics 
> -------------- EnCase Certified Examiner --------------- 
> 
> 
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> john at kk9a.com
> Sent: Wednesday, September 04, 2013 7:35 PM
> To: TOWERTALK at contesting.com
> Subject: Re: [TowerTalk] Cutting a dipole
> 
> The resonant frequency and the impedance will go up if it remained a 
> straight dipole.  Tuning it at 8 feet high is a waste of time.
> 
> John KK9A
> 
> 
> To:<towertalk at contesting.com>
> Subject:[TowerTalk] Cutting a dipole
> From:"James Setzler" <jms_k1sd at verizon.net>
> Date:Wed, 04 Sep 2013 18:32:38 -0400
> List-post:<towertalk at contesting.com">mailto:towertalk at contesting.com>
> 
> Greetings
> 
> 
> 
> I should know this but I've not made too many dipoles.
> 
> 
> 
> While it is hanging at 8 feet so I can get to it, I've cut a 40 m dipole to
> the frequency I want.  When I raise the apex to 65 feet as an inverted V,
> how will the resonance frequency change?
> 
> 
> 
>    73 James K1SD 
> 
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