To understand it better, you might try measuring the reactance changes
across one of the bands in question. Also, remember that as a fraction
of the frequency (3500 kHz, for example) the width of the band is very
significant.
73, Duane
Sent from my iPod
Duane C.
On Apr 11, 2008, at 12:28 AM, "Denton" <denton@oregontrail.net> wrote:
I have a horizital loop up about 30' that has about 240' of wire in
roughly
a trapazoid shape....have found that by using a certain length of
600 ohm
feeders with a 4 to 1 balun, I have swr below 3.5 to 1 or below on
all bands
from 80 thru 10 meters, as measured at the balun's input...with the
exception of 17 and 60 meters. I am also using about 20 ft of good
quality
coax to the shack with a TT 238A tuner to take care of the minor swr
on the
system.
I notice that on 75 and 80 meters there is a large variation in tuner
settings from one end of the band to the other....is this typical of
TT
tuners and L networks in general?
It appears to be a decent antenna system....if I can hear them, can
work
them.
I have also verified the antenna's effiectiveness by also using it
with a
link coupled transmatch...by extending the 600 ohm feeders and
running a
short stubb of 400 ohm line to the shack.
TT's L network gives me a much broader matching range, otherwise
would just
use the balanced transmatch.
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