TRANSATLANTIC RADIO TELEPHONY 



339 



quite evidently combines the narrowing of the directional diagram 

 due to the lateral array and the reduction of the back end area of the 



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. 13 — Wave-antenna array directional characteristic. Relative directional recep- 

 tivity of lateral array of two Houlton antennas. (Short) 



COMPUTED DIRECTIONAL CHARACTERISTIC (0-180°) 



COMPUTED DIRECTIONAL CHARACTERISTIC (l80°-360°) 



• OBSERVED VALUES (0-180 ] 



o OBSERVED VALUES (180° -360°) 



INDIVIDUAL ANTENNAS 

 4.49KM. 



LENGTH 



HEIGHT ABOVE GROUND=a008KM 



ANTENNA DIRECTION = N 56° 7'E 



ATTENUATION = 0.8ITU PER KM. 

 VELOCITY RATIO = 0.880 

 QUASI-TILT ANGLE = 

 0.0428 RADIANS 



LATERAL SPACING =0.350 K M. 



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

 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 I6C 

 ANGLES OF INCIDENCE (6) - DEGREES 



Fig. 14— Wave-antenna array directional characteristic. Relative directional recep- 

 tivity of modified longitudinal array of two Houlton antennas. (Short) 



directional diagram caused by the longitudinal array. A map of this 

 array is shown in Fig. 12. 



The circuits for combining four antennas of an array of the type 



