I have one of the MFJ Antenna Analyzers which can be used to test
existing coax lines. SWR can certainly be tested, but its not
intuitive how to measure line loss on cables connected to antennas.
The standard method is with open coax runs (no load of any kind which
ensures total reflection at the far end; the analyzer compares the
level of reflected signal with the original signal transmitted by the
analyzer to determine line loss). The "TRICK" is to tune
significantly "OFF FREQ" with the analyzer so that SWR is near
maximum (appears to be open circuit).
Not as handy as a TDR or analyzer like the Anritsu Site Master which
will show distance to impedance "bump", but still useful for checking
the "health" of your cables.
73, Ed - KL7UW
http://www.kl7uw.com
[email protected]
"Kits made by KL7UW"
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