High-Frequency Models in Antenna Investigations

The feasibility of a small scale analogy to study radio transmission problems is briefly discussed as an introduction to the description of model apparatus developed for this purpose. This consists of a model transmitter operating near 75 megacycles and a receiver of the screen-grid voltmeter type. Use is made of these devices to study the effect of the separation of resonant and nonresonant towers on the field patterns of the transmitter. Experimental patterns are shown and compared with corresponding ones computed from formulas derived in the included theoretical study of the problem. It is concluded that a further development of the method of models in conjunction with a study of an actual transmitting system should prove of value as a means of discovery and generalization.