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The Velocity
Factor (VF) published is not exact.
It typically is within
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5-10%
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Cut the coax 5%
to 10% longer than the stated length for the VF and
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the design
frequency
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Using a noise
bridge, grid dip meter, or MFJ 259B, set the frequency
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such that the
coax length is a *half wave* length
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Apply a PL259
male at one end, and short the other end of the coax
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length to be
pruned
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Tune the input
frequency for a minimum resistance reading (zero)
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The frequency
should be lower than the desired frequency as the
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length is too
long
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Cut some off the
coax, and re-short the open end
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Repeat until the
frequency is equal to the design frequency
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