ULTRA-SHORT-WAVE TRANSMISSION 



491 



The receiver was located on a plot of land at East Moriches, Long 

 Island, New York. This plot was immediately at the edge of Moriches 

 Bay and was only slightly (approximately four feet) above sea level. 

 The same antenna equipment was supplied here as at the transmitter. 

 Except for the transits across Sandy Hook, Fire Island Beach and 

 Smith Point, the wave path was over sea water. A second receiving 

 site at West Sayville, at the edge of Great South Bay, was briefly 

 occupied, using portable receiving equipment. This site was 52%^ 

 miles (85 km.) from Highlands. 



Fig. 1 — Map of ultra-short-wave transmission path between Highlands, New Jersey, 

 and East Moriches, Long Island. 



Apparatus and Operation 



In all, three transmitters were installed at Highlands. The first 

 one, of 100 watts output, covered the wave-length range of 5.0 to 3.5 

 meters. It was equipped with a motor-driven single-turn short- 

 circuit loop which, coupled with the tank circuit coil, produced a 120- 

 cycle frequency modulation of six megacycles amplitude. For cali- 

 bration purposes there was added a low-gain double-detection receiver 

 which used an intermediate frequency of one megacycle and was con- 

 nected so as to pick up an input from the transmitter. The beating 

 oscillator of the receiver was set for the center of the transmitter fre- 

 quency sweep and the receiver output triggered a gas tube connected 



