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To: [email protected]
From: [email protected]
Date: Fri, 5 Feb 2010 20:20:56 -0600
Subject: [Repeater-Builder] Test rig for cable length at velocity
Hi all,
I've been trying to figure out how, using relatively simple equipment,
to determine proper cable length for one-quarter wavelength cables of a
given type of cable (i.e.: RG-400). One of my thoughts was to measure
the open circuit resistance using an older MFJ-259, however this results
in strangely low impedances that I believe hamper proper readings.
Basically, I'm trying to figure out if I need to cut the cable shorter
or if it's too short, and right now nothing I have gives me any clue as
to exactly where it is, short of transmitting a few watts and watching
the SWR as I change frequency.
--
Kris Kirby, KE4AHR
Disinformation Analyst
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