I understand that, however the weird pattern is daytime and nulls some of their
service area. I doubt they are protecting any of those stations, especially as I
understand it protection only extends 750 miles anyway.. The nighttime pattern
is more-or-less a cardioid, without any deep nulls, and pointed south toward
downtown.
Wes N7WS
On 7/23/2019 5:10 PM, Joe Subich, W4TV wrote:
On 2019-07-23 7:42 PM, Wes wrote:
Why escapes me, as there is no one to service in my direction.
Typically AM patterns are designed to put nulls in the direction
of stations that a secondary user of a frequency must protect.
From the list of stations on 1030, I suspect KVOI is required to
protect WBZ (Boston), KTWO (Casper WY) and possibly XEQR (Mexico
City).
Looking at the protection requirements along with what is possible
when it comes to antenna patterns will often lead one to understand
the reason for "crazy" patterns (particularly nigh time patterns).
73,
... Joe, W4TV
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