147.285 MHz

KE8RV REPEATER SYSTEM

London, OH

Estimated Coverage Area


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The following coverage maps were generated with a free program called Radio Mobile by Roger Coudé VE2DBE.

From Roger's web site: "This software is a tool used to predict the performance of a radio system.  It uses digital terrain elevation data for automatic extraction of path profile between an emitter and a receiver. This data is added to system, environmental and statistical parameters to feed the Irregular Terrain Model radio propagation model.  Elevation data is also used to produce virtual maps in background."

This program predicts performance by taking into account transmit power, receiver sensitivity, antenna gain and patterns, coax and other losses, antenna height, operating frequency, curvature of the earth, ground characteristics (conductivity, ...) and ground terrain (elevation).  The trickiest part of this prediction is the elevation profile between transmitter and receiver.  Fortunately this data is freely available on the internet from several sources.  The data I used is from NASA's Shuttle Radar Topography Mission (SRTM).  This data has 1 arcsecond (30 meters) resolution, with elevation resolved to 1 meter. Each file covers a 1-degree square of latitude and longitude.  To cover the state of Ohio required nearly 500 MB of downloaded data.

The coverage maps that are produced do not take into account buildings, trees, local interference and noise.  Here are some predictions based on typical mobile, handheld, and base station performance characteristics.  If you look closely (load the full-size map into your favorite image editing program and enlarge or magnify it) you will be able to see very fine details of the topography.  Especially at the fringes, it will be obvious where the hills (with signal) and valleys (no signal) are located.

Click on the picture to see the full-size version of the map.  Use you browser's BACK button to return to this page.


Transmitter Coverage
Transmitter coverage area for a typical mobile receiver.

The RED area represents the strongest signal area, the DARK BLUE represents a weak but usable signal.
Transmitter Coverage
Transmitter coverage area for a typical mobile receiver showing a larger area.

The RED area represents the strongest signal area, the DARK BLUE represents a weak but usable signal.
Transmitter Coverage
Transmitter coverage area to a typical base station.

The RED area represents the strongest signal area, the DARK BLUE represents a weak but usable signal.
London Receive Site
London receive site coverage.

The RED area represents where a low-powered handheld should have no trouble getting into the system.  Mobiles should have no trouble from the GREEN or BLUE areas.
West Jefferson Receive Site
West Jefferson receive site coverage.

The RED area represents where a low-powered handheld should have no trouble getting into the system.  Mobiles should have no trouble from the GREEN or BLUE areas.
Plain City Receive Site
Plain City receive site coverage.

The RED area represents where a low-powered handheld should have no trouble getting into the system.  Mobiles should have no trouble from the GREEN or BLUE areas.
Sedalia Receive Site Coverage
Sedalia receive site coverage.

The RED area represents where a low-powered handheld should have no trouble getting into the system.  Mobiles should have no trouble from the GREEN or BLUE areas.
Total receiver site coverage
Total receive site coverage - Combined coverage area of all four receive sites.

The RED area represents where a low-powered handheld should have no trouble getting into the system.  Mobiles should have no trouble from the GREEN or BLUE areas.





Copyright ©  2006 All rights reserved   Donald Kovalchik

If you have any questions or comments about this web site, send an email to:
W8DPK email
This page last updated January 30, 2006