If there's a reason for phasing at the antenna, it's that storing the
phasing lines
inside the shack can impact available space. But it's a much better
solution than
switching at the antenna, for reasons of phase stability, weathering,
and simplicity
of switching.
As you know, MF broadcast arrays routinely do their phasing inside
the tx shack,
using a lumped-constant phasing and power splitting network.
No reason hams couldn't do something similar, and just coil up the
phasing lines
in a box. Switching could then be done with simple manual coax
switches.
n2ea
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