AM broadcast stations do not operate the same as FM. Both the tower and ground system are considered for daytime and nightime coverage. Changing the tower or gound system -- requires a new CP (application). In an emergency -- you could get an STA.. But -- STA's are not given for regular fulltime - perminent operation. The FCC Standard requires a non-directional ground system -- of 1/4 wave ( 90 degrees ) of 120 radials spaced 3 degrees apart. KGY-AM in Olympia or the 1240 in Monterey, California (old KMBY AM) --- as all other AM Broadcast stations --- use a standard 120 radial system. All or part of the ground system may be "under water". If any of the 120 radials were shorter -- than the signal would no longer be Non-directional. For many years KDOL - 1340 in Mojave, CA -- used only 100 watts fulltime. The tower was located next to a site used to dis-mantle large train box cars. Large amounts of scrap metal are baried under the site. _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca
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