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Figure 46 (Continued). 



CARAMBA II 



CARAMBA II consists of the radiating array described above, and is fed by 

 means of 32 three-bit amplitude and phase boards through a 1:32 uniform power 

 divider. This allows eight different, amplitudes and eight different phases to be 

 applied to each array element, thus giving many possible amplitude and phase dis- 

 tributions across the array aperture. The system is shown schematically in figure 

 47 and a typical pattern is shown in figure 48. Some pattern deterioration is ob- 

 served near the ends of a 20-percent frequency band, but the results can be improved 

 by phase-trimming techniques presently under study. A computer prediction of side- 

 lobe level gave about -17 dB using the three-bit phase and amplitude distributions 

 implemented on the array. The phase quantization approximation contributes a large 

 factor to the relatively high side lobes. The system is scanned through 360° in 

 azimuth using a four-pole switch to select elements in each of the four quadrants. 



10 



