http://elecraft.85.s1.nabble.com/Grounding-question-on-remote-tuner-tp7629022p7629031.html
terminals directly to the service entrance ground connection. This,
terminal far from the service entrance. I believe that the NEC has
provisions for such cases [e.g. a barn or other outbuilding located some
200 ft sticks in my mind, but don't bet your paycheck on that.
many in the garage after our move. It is at least a decade old. It
Possibly someone who actually knows can enlighten the rest of us. It
> 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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