from the original post
"I guess that my saving grace is that all of the radials are individual
runs
and could be added or subtracted from the field for testing. The goal for
the radials would be to use them with lowband inverted "L"s or even a
shunt
fed tower some day."
As you well know, buried bare radials are the standard for BC stations,
and as are any ground screens therefore "connected" to earth, but that
's not the point. The CW is bare or insulated makes no difference for
buried wire radials.
If elevated, I agree, don't connect to earth. Any opportunity to
provide more shielding (conductive area) within the buried radial field
should probably connect to a proximate radial. Although as I noted,
there may be pattern distortion. So it's not my confusion.
Here is a simple thought experiment: If a vertical was in the center of
a large concrete slab that was reinforced with the standard 4x4" wire
mesh, would you connect or not connect to the wire mesh in order to use
it as a ground screen?
Grant KZ1W
On 12/9/2015 21:46 PM, Jim Brown wrote:
On Tue,12/8/2015 7:59 AM, Grant Saviers wrote:
IMO, connecting radials to the rebar in concrete slabs and
foundations is a good thing.
There's confusion here. The purpose of radials is to SHIELD the field
produced by the antenna from lossy earth, NOT to CONNECT to earth. The
intent is that the field couples to the radials and NOT to the lossy
earth. So -- unless the radials are for a grounded tower, it is NOT a
good thing to connect radials to the tower base. N6LF has also
observed that connecting radials to ground tends to make radial
currents more unbalanced, which increases ground losses.
73, Jim K9YC
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