An Unattended Ultra- Short- Wave Radio Telephone System * 



By N. F. SCHLAACK and F. A. POLKINGHORN 



FOR several years attention has been directed by Bell Telephone 

 Laboratories toward determining the characteristics of ultra-high 

 frequencies and their possible application to the telephone plant. This 

 led to the belief that ultra-high-frequency radio might find a useful 

 field as an adjunct to the wire telephone plant in crossing natural 

 barriers where other means might prove difficult or expensive. 



Map 



In order to make the new facility practicable for use in as many as 

 possible of the situations for which it is technically adapted, it is 

 necessary to keep the total operating costs low. By designing the 



* Digest of paper presented at Annual Convention of the Institute of Radio 

 Engineers in Detroit, July, 1935. The paper will be published in full in the Proc. 

 J. R. E., October, 1935. 



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