Randy,
The RF does not need a ground other than the obvious connection to your
radial connection point.
I would dispense with the "unun" and connect the antenna wire and radial
connection point directly to your tuner. A few feet of wire from your
tuner to those points will not make a big difference since your antenna
is not resonant.
The only reason I can think of to connect your tuner to "station ground"
is for lightning protection. While that is a consideration not to be
taken lightly, be aware that *all* ground rods must be connected by
heavy wire to the utility entrance ground rod. That heavy wire is #6
bare copper but #4 is preferred. That connection is for AC mains
safety, not for lightning protection or anything having to do with RF.
The concept for lightning protection is to spread as much of the charge
as possible over as large an area of the earth as is possible. Your
radial system will help do that *if* the wires are large enough to
withstand the surge without evaporating the copper.
73,
Don W3FPR
On 4/5/2017 2:19 PM, Randy Cook wrote:
Weather damage repair time. I am rewiring my ~84 foot inverted L antenna
system, Up a SpiderPole about 31 feet, out about 53 additional feet. Still
tuning length.
I have mounted a remote MFJ tuner on a post about 3 feet from the antenna base.
Antenna wire goes down the pole, connects to 4:1 Unun input lug, then goes via
coax to tuner. Out of the tuner to a long coax run to my shack. Choke at the
rig end of the coax run.
Radials mount on ground connection lug on the Unun.
I was a bit confused with the tuner wiring. The manual says to connect ground
lug to the ‘system ground’, I assume that means the radial collection point.
But, isn’t the tuner already connected to the ‘system ground’ via the coax
shield? Is it necessary to run another wire from the tuner ground to the radial
connection ground?
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