Assuming I understand your configuration and that when you say "isn’t
the tuner already connected to the ‘system ground’ via the coax shield?"
you mean the 3 ft of coax from the 4:1 transformer to the tuner:
The 3 ft path from the transformer ["unun"] to the tuner is handled by
the coax. The "tuner ground" would then become a safety ground ...
which is a very large, long, and tedious subject involving the NEC,
UFER's, large conductors, a lot of work, and possibly $$.
If "long coax to the shack" means the tuner is a long way from the shack
and your service entrance, I'd drive a ground rod at the tuner and
connect the lug to that. I'm probably wrong, but that's what I'd do.
73,
Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn
On 4/5/2017 11:19 AM, 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?
Thanks in advance for any advice.
73
Randy - K6CRC
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