720 



BELL SYSTEM TECIIXICAL JOIRXAL 



branches but will not appear in the input waveguide. Certain impedante 

 matching adjustments are obtained through the use of the matching rods 

 positioned as shown. 



The method of insertion of the crystal cartridge into the waveguide in this 



TRANSFORMER 



TUNING 



CAPACITOR 



I-F OUTPUT 



BALANCE TO 



UNBALANCE 



I-F TRANSFORMER 



BEATING- OSCILLATOR 

 INPUT 



SIGNAL INPUT 



BEATING -OSCILLATOR 

 MATCHING ROD 



BEATING - OSCILLATOR 

 INPUT 



Fig. l.S. — Balanced crystal converter em])l()\iiig wave-guide hybrid junction. 



design follows the scheme eniployc.l in the converter just described. How- 

 ever, here two crystal elements are em])loyed in a balanced form which 

 necessitates a balanced-to-unbalanced imj)e(lance transformation of the TF 

 output signal for transmission over a coa.xial line to the input stage of the 

 II"' ami)litier. The degree of balance obtainable here is necessarily a fiuic- 



