On 6/21/22 1:06 PM, John Langdon wrote:
It can tell you how each antenna will do individually but does not calculate
the combined patterns exactly.
73 John N5CQ
From: TowerTalk <email@example.com> On Behalf Of David Gilbert
Sent: Tuesday, June 21, 2022 1:01 PM
Subject: Re: [TowerTalk] Stacking Tribanders
HFTA should never be used to try to optimize stacking distance. It simply does
not actually calculate the stacking gain as a function of stacking distance
like EZNEC would.
I'm not sure the "transform to a single antenna at the mid distance" is
universally valid - that is, two antennas will have their own set of
lobes and nulls, and the combination of those will vary with the phasing
and weight of the two antennas. I'm not even sure it's valid if the
only case considered is summing equal amplitudes in phase.
You could probably do HFTA on each one individually, and then work up an
Excel spreadsheet to combine them.
TowerTalk mailing list