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BELL SYSTEM TECHNICAL JOURNAL 



of beating frequency. A small amount of automatic volume control 

 is provided to compensate for slight variations in received voltage 

 caused by variation in humidity and other factors. The receivers are 

 capable of delivering 0.3 watt of undistorted power to a 600-ohm 



Fig. 4 — Ultra-short-wave receiver mounted in metal container 

 suitable for pole mounting. 



impedance. This is well in excess of the power required during normal 

 operation. 



The transmitting and receiving antennas are identical and each is 



