[Repeater-Builder] Propogation Prediction

30 Aug 2004 11:24:59 -0000

There are some very high quality computer propagation predicting computer programs available that use USGS data maps. However these are expensive and only the companies that are into coverage predicting in a commercial way can afford them. But they are good.
 
The first paper on VHF and UHF Propagation predicting that I became aware of was written by an engineer at GE Mobile Radio Department in 1962. It was well circulated and included in their Data File as a Bulletin 10003-1 (Abstract: This bulletin is provided for calculating the coverage which a certain VHF and UHF transmitter will provide or for calculating the power which a transmitter must have to cover a certain area. Such factors as path clearance, transmission line losses, antenna gains, and reliability are all taken into account for paths as long as 1000 miles). It is written for the knowledgeable technician and engineer. The charts and curves contained in this work were the basis for most all future computer propagation predicting programs of the 80's. For the radio shops and limited users this was a life saver. Also, a slide rule type prediction calculator (Range and Transmitter Power Calculator) was designed for the mobile radio sales people to use. These were such good tools that most manufactures and sales people in the 60's and 70's highly valued there use, even "M's" sales people would carry one in their brief cases.
 
I doubt you could find the slide rule calculator now unless someone hoarded a bunch of them. The Datafile Bulletin 10003-1 dated July 1962 could be copied from some of the old timers in the industry. It could be of great benefit to answer some of the recent questions that have been on the Repeater-Builder mail.
 
Sorry I do not have any extras. Maybe someone has some that could be scanned and posted.
 
Fred


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