Jim, K9YC's comments on how to use an antenna analyzer are a valid and a
useful alternative to determining the length of cables. I would think for a
long cable run more accuracy would be experienced if a spectrum well below
the antenna resonance is chosen.
I have been accustomed at using the old school TDR approach from my days as
a CATV engineer. But I also have a MiniVNA which will accomplish the same
thing as Jim describes.
One would still have to calculate each leg separate from the other to
determine the difference in branch cable lengths. If the delta is <20
degrees, I probably wouldn't make any changes on a two bay array spaced a
1/2 wave (not the best spacing for gain), or more apart (better).
Ray, W4BYG
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