At 02:26 PM 10/14/2004 -0400, you wrote:
>
>Ok, So you can make some kind of filters by placing a "T" in line with a
piece of equipment and cut the Coax for 1/4 wavelength at the desired
frequency.
<---As the others pointed out about 1/4 wavelengths lines (or odd
multiples), they "invert". Don't
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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.)
I built a set of 6 meter notch filters using this web site:
http://www.dallas.net/%7Ejvpoll/dup6m/dup6m.html
(I found this site by doing a search on repeater-builder.com) I had great
results with them. They have shorted ends.
Here is a site talking about 2 meter with OPEN ends..
http://www.xs4all
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