450 



BELL SYSTEM TECHNICAL JOURNAL 



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INPUT 

 LOOP 



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a. COAXIAL TYPE 



WAVE GUIDE 

 TRANSMISSION LINE 



b CAVITY TYPE 



Fig. 7 — Types of frequency meters. 



Fig. 8 — A group of frequency and power meters designed for various I^ands in the 

 frequency range 500 to 25,000 mc. 



