On 5/15/2020 8:27 AM, donovanf@starpower.net wrote:
A more reliable approach is a tuner in your shack. The extra coax
cable loss from elevated VSWR is insignificant on topband.
I strongly agree with this.
Another suggestion. Do your best with what you can rig, using as much
top-loading as practical rather than base loading. Sweep the feedpoint Z
with a good analyzer, export the data to SimSmith, do a TDR of the
feedline to find it's electrical length, and compute the match. I
recently did that for W6GJB's new 630M antenna, and came up with shunt L
at the base of the antenna and series C in the shack. Every antenna is,
of course, different.
73, Jim K9YC
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