332 



BELL SYSTEM TECHNICAL JOURNAL 



mission from the several European transmitting stations which are 

 designated on this figure. The measurements on the Houlton antenna 

 system were made using a portable two-kilowatt transmitter located 



HORIZONTAL EFFECT ONLY 



COMPUTED DIRECTIONAL CHARACTERISTIC 



• OBSERVED VALUES (0°- 180°) 



o OBSERVED VALUES (l80°-360°) 



LENGTH = 5.I5KM. 



HEIGHT ABOVE GROUND = 0.008KM. 



ANTENNA DIRECTION = N 56° 7'E 



FREQUENCY = 60KC. 



CHARACTERISTIC IMPEDANCE =424.2-j50.l OHMS 



ATTENUATION = 0.86 TU PER KM. 



VELOCITY RATIO = 0.870 



EFFECTIVE HEIGHT =0. 301 KM. 



1927 



10 20 30 40 e>0 60 70 80 90 100 110 120 130 140 150 160 170 180 



360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 ISC 



ANGLES OF INCIDENCE (e) — DEGREES 



Fig. 8a — Relative Directional Receptivity of Houlton Antenna "A" Uncompensated 



(Long) 



0.9 



> 

 ^; 



> 0.8 



h- 

 Q. 



ly 

 a. 

 ^0.6 



< 



I 0.5 



I- 

 o 



UJ0.4 



10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 



360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 



ANGLES OF INCIDENCE (e) — DEGREES 



Fig. %h — Relative Directional Receptivity of Houlton Antenna "A" Uncompensated 



(Short) 



successively at each of the 22 positions shown on the map, Fig. 9. 

 The authors wish to thank Mr. G. D. Gillett for his efficient operation 

 of this transmitter during the summer of 1927, 



