IMHO THEORY BUT THATS WHAT WE ALL NEED TO START WITH.
There is also some SIMPLE math. To understand THEORY.
Even if it isn't always that simple......
Bur we are Radio Amateurs aren't we ???
Sorry for that "monkey wrench".
Jos on4kj
-----Message d'origine-----
De : towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] De la part de Pete Smith
Envoyé : mardi 17 avril 2007 18:49
À : towertalk@contesting.com
Objet : Re: [TowerTalk] 135deg cable
At 09:06 AM 4/17/2007, Roger D Johnson wrote:
>donovanf@starpower.net wrote:
> >
> > The phase delay of any transmission lines is N O T the same as its
> > electrical length except when either of these two special conditions
> > is
> met:
> >
> >
> >
> > 2. if the line length is any multiple of exactly 90 degrees, its
> phase delay is the same as its electrical length and the phase delay
> > is not dependent on the VSWR on the line.
> >
> >
>I don't think this is true. My old memory says the length is 180 deg.
>
>73, Roger
You're right. On page 11-7 of the current edition of the ON4UN book, Fig.
11-6 charts phase shift vs line length for various load mismatches. For a
given mismatch the phase error appears greatest at 90 degrees and zero only
at 0 and 180 degrees.
73, Pete N4ZR
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