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4O2
Radio Broadcast
The application of science in the forward march of civilization. View of 6oo-foot selfsupporting steel tower being erected among the native huts at Cavite, Philippine Islands
prising messages in the English language constantly spreading over the entire Earth.
Obviously the establishment and successful operation of this widely extended chain of high-power radio stations involved very great difficulties, not only from the constructional point of view but also the technical aspects of the situation.
In a pioneer undertaking of this kind when dealing with a new art whose development was then and is now rightly regarded as being only in its infancy, especially as regards the use of high power, very little authentic information was available as a guide as to what results could actually be expected in service, and the question of the most suitable type of antenna supports, antenna and ground systems, antenna insulators, types of transmitter, power supply, etc., were matters of theoretical contention based largely on personal opinions.
Time has proven that experience, and successful experience alone, is the only true guide in designing a radio system. This experience was not then available to the Navy. Nothing
is easier than to take a map, mark out radio station sites, connect them by straight lines and call the arrangement a radio system; but nothing is more fallacious in radio. The type of transmitter to be adopted was, of course, of very great importance, as was also the type, height, and location of antenna supports. Other important features could be modified, if required, after the stations were placed in service without involving excessive interruption to service; but it would be an extremely difficult and costly matter to replace transmitters or to rearrange the antenna supports.
One of the fundamentals in radio technique is that the strength of signals at a distant receiving station is dependent upon the effective height at which the overhead wires of the antenna system are suspended above the earth, and the value of the current delivered to the antenna without causing brushing or corona formation at the transmitting station.
Obviously, therefore, regardless of all other considerations, it is always desirable to suspend the transmitting antenna the greatest distance