[TowerTalk] 135deg cable

[Roger D Johnson]

Michael Tope wrote:
> Pete,
>
> Figure 11-6 shows the "current phase shift" of a 50 ohms line
> versus electrical length for 3 cases (1 matched, 2 different
> mismatches). This is equivalent to ANGLE (Iout | Iin). With
> the 90 degree line ANG (Iout | In) <> 90 deg is VSWR <> 1.0,
> but ANG (Iout | Vin) = 90 deg for any load impedance. See
> paragraph 3.4.5 on W7EL "Current Forcing" properties of 90
> degree lines.
>
> 73, Mike W4EF........................................
>
>
>   
Hi Mike et al....

What you say is absolutely correct. However when one talks about the 
phase shift
through a circuit or transmission line, it is assumed that the same 
property is used at
both ends; i.e current or voltage. Frank's blanket statement that the 
phase shift through
a 90 degree line is always 90 degrees requires some qualification. Also, 
the statement
that it exists for ALL multiples of 90 degrees is incorrect. It only 
applies to ODD
multiples of 90 degrees.

73, Roger

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