This may be useful as a rule of thumb distance.
§73.186 Establishment of effective field at one kilometer. (47 C.F.R.
§ 73.186(a)(1))
(a) Section 73.189 provides that certain minimum field strengths are
acceptable in lieu of the required minimum physical heights of the
antennas proper. Also, in other situations, it may be necessary to
determine the effective field. The following requirements shall govern
the taking and submission of data on the field strength produced:
(1) Beginning as near to the antenna as possible without including the
induction field and to provide for the fact that a broadcast antenna is
not a point source of radiation (not less than one wave length or 5
times the vertical height in the case of a single element,i.e.,
nondirectional antenna or 10 times the spacing between the elements of a
directional antenna), measurements shall be made on six or more radials,
at intervals of approximately 0.2 kilometer up to 3 kilometers from the
antenna ...
73,
Don
On 9/5/2021 11:00 AM, [email protected] wrote:
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