At 02:36 PM 10/14/04, KI4AWK wrote:
>An open cable 1/4 wavelength will appear "shorted" to the signal input at
>its frequency.
>A shorted cable 1/4 wavelength will appear "open" to the signal input at its
>frequency.
>(a combination can be used to make a BP-BR (band pass, band reject)
>duplexer.)
>If someone would confirm this, I would appreciate it. That is what I
>remember. Check me out.
You're right. The general rule is that an ODD number of 1/4 wavelengths
will reverse what's at the end (open looks like short, short looks like
open). An EVEN number of 1/4 wavelengths repeats what's at the end. Any
other length and anything other than an open or short requires calculation
for the exact length, frequency, and coax impedance to determine the
resulting impedance.
Roger Grady K9OPO
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