I have three suggestions:
1) If you are feeding the antenna at the precise end of the wire, move
the feedpoint out a few feet. That's because you need "the other half of
the antenna." Because of the high impedance at this point, only a few
feet are needed.
2) Don't connect one side of the ladder line to a ground rod. It doesn't
help and will probably hurt. If you want to ground something, ground the
shield of the coax at the tuner.
3) Use a good 1:1 balun designed for antenna tuner use between the tuner
and the ladder line. Yes, people say you should use a 4:1 balun. Don't
listen to them. The impedance at the end of the ladder line will be low
on 40m (it's transformed by the near 1/4 wave ladder line). If you use
the antenna on other bands it will vary all over the map.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 16/01/2019 4:15, John Pierce wrote:
I haven't read all the comments on this thread and thus may requesting
redundant info. My antenna, for 40 mtr's, is a 67' wire up about 25'. I
have 30' of 450 ohm ladder line connected to the end of the antenna and
bringing the antenna into my basement. So I guess you could say that I have
a non-resonant end fed Zepp.
I can check the impedance at the end of the ladder line, where one side is
the antenna and the other side is connected to a ground rod at the point of
entering the house. I can measure the impedance of the antenna in the
basement, using Mini60 without an antenna tuner . The ladder line is then
connected to a MFJ 926B remote antenna tuner The tuner is fed by about 30'
of RG58 coax from my transmitter. When I see a reactive component to the
impedance of the ladder line, without the tuner connected, should I have
some choke inserted in one side of the ladder line or not? Should the tuner
be able to handle the reactive component?
John
AD2F
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