There may be reasons for certain heights. I found from Smith chart work that
the 70 foot was optimum for 80m as a single series C was all the network
needed to cover most of that band.
Hi Bob,
Thanks for the information about your experience with verticals of
various heights. I don't intend this to be a criticism, just an
observation. It seems that quite often hams choose ease of matching to
their transmitters, over other considerations that may be more important
in producing a stronger signal. In this case you called the 70 foot
vertical "optimum" because the matching system was simple. In this
particular case you are talking about a pretty efficient antenna, and
good capacitors usually are much less lossy than most inductors. So in
some sense this length antenna really is optimum. All too often though,
I hear of hams being stuck on the notion that a low SWR over a wider
potion of the band is a good thing, when it actually can be an
indication of a lossy antenna.
Ken N6KB
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