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List:       elecraft
Subject:    Re: [Elecraft] Using the Antenna Tuner in the XPA100
From:       Fred Jensen <k6dgwnv () gmail ! com>
Date:       2022-06-30 22:03:49
Message-ID: b4938fd3-9032-29eb-d9e8-eae15732e109 () gmail ! com
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One would think so, but maybe strangely, there is no sign of any RF on 
the coax at the rig connection.  My coax run is 100' of RG-8 laying on 
the ground.  Because of a walkway made of pavers between the house and 
autotransformer on the fence, it runs under the antenna along the fence 
to a conduit under the walkway, and then back next to the foundation, 
still on the ground, to a 1 1/2" entrance weather head and pipe into the 
house just above the floor level, and then about 6 ft to the rig.  The 
autotransformer on the fence has a ground screw with a wing nut but 
nothing is connected to it.

For awhile, I just had a 25 ft coax run laying across the walkway and it 
all behaved the same.  Wife "convinced" me to get the black hose off the 
pavers. [:=)  I expected I'd have to choke the coax at the house 
entrance [and maybe a lot more], I have no idea why I didn't need to.

Full Disclosure:  While I've spent a number of years in college, have a 
couple of degrees, and am comfortable with the mathematics of RF, I'm in 
my 70th year with a license and my usual approach to anything is the old 
school, "try it first."

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Jim Brown wrote on 6/30/2022 11:52 AM:
> On 6/30/2022 11:07 AM, Fred Jensen wrote:
>> The outer surface of the coax shield to the rig forms the 
>> counterpoise [i.e. the "other side of the antenna"].
>
> While this does work for transmitting, it also is a recipe for "RF in 
> the shack." In addition to "lighting up" the shack, the counterpoise 
> does not stop at the station -- it continues on every wire connected 
> to the station, including power wiring. At a minimum, this demands 
> serious bonding of everything in the station.
>
> 73, Jim K9YC
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