Randy,
I would definitely ground the remote tuner. I infer that you are
feeding the inverted L at the base and working it against ground. In
this circumstance, the antenna tuner is a part of the system and should
be grounded to the remainder of your ground system. Think of it this
way. Your tuner in in series between the inverted L and your ground
which represents the other half of your antenna system.
I'm not sure I would use an 4:1 unum as you are. I would put an
isolator between the tuner and the run to your shack. You will be
feeding the antenna through the tuner which needs to see both the ground
half of your antenna system and the antenna itself. The unum will
attempt to isolate parts of the system that should not be isolated.
However, you do need to keep RF off the transmission line going to the
shack and an isolator will accomplish this.
73,
Barry
K3NDM
------ Original Message ------
From: "Randy Cook" <k6cr...@gmail.com>
To: elecraft@mailman.qth.net
Sent: 4/5/2017 2:19:30 PM
Subject: [Elecraft] Grounding question on remote tuner
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?
Thanks in advance for any advice.
73
Randy - K6CRC
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