On 3/25/2020 11:57 AM, Jim Brown wrote:
...
I don't know if it's still required today, but when I worked in
broadcasting, each station using a directional antenna was required to
make periodic field strength measurements in their nulls to proof
their pattern.
Back in the 1960s when I was chief engineer at an AM station along the
Rhode Island coast (Westerly) we had to pass periodic checks, not for
nulls - it was a single stick - but for verifying the required signal
strength over the licensed coverage area. The issue was the radial
system that was in swampy land on the bank of a river where it dumped
into the Atlantic Ocean. The salinity varied widely with river flow,
tides, and seasons.
Gus Hansen
KB0YH
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