Jake
One very simple solution is a double inverted V. I built and used this
antenna for several years. The SWR can be 1:1.5 or lower from 3.5 to 3.8
MHz. The basic principal is a double dipole spaced 4 to 6 ft, very fat. The
impedance at the enter is 300 ohms, however if you make it an inverted "V",
the feed impedance is 200 ohms. The tower can be at the center with two
support 2 to 3 ft each side. This configuration makes easy to hung a large
4:1 BALUN on the feed point. I recommend the BALUN with material #2 T300B
or T400B with Teflon isolated wire, T200 is too small. Adjust the antenna to
min SWR around 3.65 MHz. With a good BALUN the SWR would be very low, 1:1,05
is very achievable. I like a good quality RG-213. To keep the wires moving
with the wind I used two 1/2 white PVC tune and a 3/4 at the end, on each
side. You may not need a tuner at all.
73
JC
N4IS
-----Original Message-----
From: Topband <topband-bounces+n4is=comcast.net@contesting.com> On Behalf Of
jcjacobsen via Topband
Sent: Saturday, November 12, 2022 11:08 AM
To: topband@contesting.com
Subject: Re: Topband: Dipole/remote tuner
Looking for input from the collective knowledge of the reflector.
You have a wire dipole for 75 meters fed with a 1:1/5K rated balun. You want
to transition to a remote tuner so you can move around 75/80 meters.
The question is: Do you leave the balun in place, or remove it and feed the
dipole directly from the remote tuner? We have mixed answers from the local
"Population". That's why I'm coming to the reflector.
Please, don't be critical and ask questions like: what gauge wire, bare of
covered wire, How high, yada yada yada,
That's all. Thanks in advance.
73 K9WN Jake
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|