-----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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