On Oct 20, 2004, at 3:12 PM, Peter Frenning, OZ1PIF wrote:
----- Original Message ----- From: "R. Measures" <r@somis.org>
To: "Peter Frenning, OZ1PIF" <oz1pif@privat.dk>
Cc: "'Barry Kirkwood'" <bjk@ihug.co.nz>; <amps@contesting.com>;
"hermans" <on4kj@skynet.be>; "'Rob Atkinson, K5UJ'" <k5uj@hotmail.com>
Sent: Wednesday, October 20, 2004 7:33 PM
Subject: Re: [Amps] 5 kw amps -- why?
On Oct 20, 2004, at 8:08 AM, Peter Frenning, OZ1PIF wrote:
Unlike beautiful women you CAN make a both beautiful AND usable Balun
yourself - take a 35mm or bigger 4C65 core and a length of RG400
Coax; wind as many windings on the core as will fit (8 will do nicely
from 160m to above 10m) and fit the whole thing into a Marine Quality
junction box equipped with a PL socket, and three stainless steel
eyebolts, and you'll have a pleasing wetherproof 1:1 balun that'll
last a lifetime and carry legal limit almost indefinitely...
Peter -- The drawback is only being able to carry 1500W-pep. Ugly
baluns can easily do 10db more.
Rich -- No problem, then you just use the next larger size PFTE Coax
(can't remember the RG designator)
and a larger core + of cause a box to fit :-))
It's cheaper to wind coax on ABS pipe and the air core won't saturate.
This is what carry my HB W3DZZ into the air.....
Vy 73 de OZ1PIF, Peter
********** OZ1PIF **************
email: oz1pif(no-spam-filler)@privat.dk
http://home24.inet.tele.dk/oz1pif/
Ph. +45 4619 3239
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************
----- Original Message ----- From: "hermans" <on4kj@skynet.be>
To: "'R.Measures'" <r@somis.org>; "'Barry Kirkwood'" <bjk@ihug.co.nz>
Cc: "'Rob Atkinson, K5UJ'" <k5uj@hotmail.com>; <amps@contesting.com>
Sent: Wednesday, October 20, 2004 4:51 PM
Subject: RE : [Amps] 5 kw amps -- why?
-----Message d'origine-----
De : amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
De
la part de R.Measures
Envoyé : mercredi 20 octobre 2004 16:34
À : Barry Kirkwood
Cc : Rob Atkinson, K5UJ; amps@contesting.com
Objet : Re: [Amps] 5 kw amps -- why?
On Oct 19, 2004, at 11:44 AM, Barry Kirkwood wrote:
Well, I manged to fry a "1500W " commercially made ferrite balun
with
significantly less than 1500kW out, let alone 3kW plus.
The ferrite used in commercial HF baluns typically has a mfg.'s max
freq rating of 500KHz to 1MHz. However, since balun mfg.'s usually
test their products at <5w, they have no idea that there could be a
problem. My disillusionment with ferrite baluns began when I
discovered that my 7MHz signal had harmonics above 500MHz that were
strong enough to wipe out UHF line-of sight TV stations.
Since then have lived in peace with my homebrew coax solenoid baluns.
Amen, Barry. Beautiful baluns are like unto beautiful women.
*******************************************
Bad tongue ON
THEY ARE VERY EXPENSIVE AND RUN AWAY VERY QUICKLY.......
Bad tongue OFF
Jos on4kj
*******************************************
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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