As this discussion rages I'd like to ask for the following facts.
(If we can contextualize the discussion we will have an improved
possibility of learning something useful together.)
A. How do the patterns of the Force 12 C3 and Tennadyne
T10 compare?
B. What is the impact of the unique vertically polarized influences
within the log periodic pattern?
C. What do the computer analysis programs say the comparative
gain figures should be for the C3 versus the T10?
D. What do the computer analysis programs say the comparative
swr figures are for the C3 versus the T10 across the Ham Bands?
Notes: I am using the C3 as a comparative beam because it eliminates
variables present in the trap antennas, and because multiple
yagi-log comparisons are too complex for me to sort out!
I am wondering if there are some frequency-specific and
environment-
specific (including day, time, propagation, geography, and
target region)
pattern and polarization anomalies that may explain some of the
varied
real-world performance claims.
My personal location would be at 65 or 70 feet above sandy
central
Florida soil, so if someone wants some assumptions from which to
run numbers there are some. Such analyses are beyond my
resources.
Thanks! & 73, DavidC K1YP
> 2) Log periods are not chosen for gain. The are
> chosen for bandwidth.
> Per pound, foot of boom length, $ or anything
> else, they are theoretically and demonstrated to
> be worse than antennas designed for and optimized
> for narrower bandwidths. See 1. You've traded
> gain for bandwidth.
> ...
> 3) If the T10 were tested head-to-head with some
> of the antennas mentioned, in test range
> conditions, they would probably be worse in a gain
> sense. If there were any benefit at all, it would
> be small (1 to 2 db). The benefit, if any, would
> probably be due to boom length-- not the the
> "superiority" of log periodic antennas for gain.
> ...
> 73 de Brian/K3KO
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