Mr. JH I must first congratulate you: You are the first person ever to use
me and "design
paradigm" in the same context. No I don't use anything to try to suppress
feedline radiation with a dipole. I do a little 'trial-n-error' tweaking the
lengths to achieve minimum swr at the transmitter for the freq. range I'm
interested in. I take off, or add, the exact amount on each side. I have
never seen definitive documentation that the feedline radiation is enough to
worry about. 1 or 2 watts of feedline loss isn't meaningful and, for me,
doesn't justify the extra expense or the weight.
To clarify for Billy Cox it is 33 feet per side. I ass/u/me everyone would
have understand what I meant(I was wrong).
73
MAL
N7MAL
BULLHEAD CITY, AZ
http://www.n7mal.com
Everyone in the world is
entitled to be burdened
by my opinion
----- Original Message -----
From: Richards
To: N7mal
Cc: William Moore ; towertalk@contesting.com
Sent: Friday, June 20, 2008 0:30
Subject: Re: [TowerTalk] Trapped in antenna trap confusion
Dr Mal --
Do you use anything as a sort of line isolation transformer in your dipole
design? Or... do you just connect the coax to a simple center conductor
and run with it? Some advocate a several turn coil to minimize the chance
of RF on the coax shield. What is YOUR take on this in your design
paradigm?
THANKS -- JH Richards - K8JHR ------------------------------------------
=====================================================
N7mal wrote:
> I've used the reyco traps. The keyword is traps. They really are traps,
> not
> dipole shorteners like
> I also have never used, and will never us, a balun on a dipole.
=====================================================
--------------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG.
Version: 8.0.100 / Virus Database: 270.4.0/1509 - Release Date: 6/19/2008
8:00 AM
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|