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Re: Topband: Skywave vs. Earth Conductivity

To: <topband@contesting.com>
Subject: Re: Topband: Skywave vs. Earth Conductivity
From: "Richard Fry" <rfry@adams.net>
Reply-to: Richard Fry <rfry@adams.net>
Date: Fri, 13 Feb 2015 11:02:27 -0600
List-post: <topband@contesting.com">mailto:topband@contesting.com>
The link below shows the transmit site used by WFAN (which is diplexed with WCBS into the same vertical monopole). The site is located on a small island in Long Island Sound.

The horizontal distance along the surface of this island on the ENE radials reaching the sea water of Long Island Sound is about 300 feet from the base of the monopole. So toward that azimuth sector, this transmit site is about as close as practical for claiming a "vertical on a beach."

The groundwave fields from this site are strongly affected by the nearly 100% sea water path lengths to the ENE, down Long Island Sound. However the radius to the FCC 0.25 mV/m skywave values shown in the link of the OP show no enhancement in that sector over those fields radiated in any other azimuth.

http://s20.postimg.org/ktz4v7o19/WFAN_WCBS_Tx_Site.gif

RF
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