[TowerTalk] 135deg cable

[Roger D Johnson]

donovanf at 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

-- 
Remember the USS Liberty (AGTR-5)
http://ussliberty.org/


There is a diagram in Low Band DXing that shows the phase shift
through a quarter wave of RG-213 with different terminations.
When terminated in 50 Ohms with no reactance the phase shift is
indeed 90 degrees. When terminated with 21+j20 Ohms, the phase
shift is approx 110 degrees, and when terminated with 51+j20,
the phase shift is approx 45 degrees! These values are what one
might see at the bases of a two element vertical array spaced
90 degrees.

73, Roger