224 



BELL SYSTEM TECHNICAL JOURNAL 



FILTER 

 NO. 



^ > 



50 FREQUENCY oo 



FpEQUENC -i 



c 



/L 



I/I 



NOTE- IN COLUMN D, DOTTED LINES INDICATE REACTIVE IMPEDANCE 

 SOLID LINES INDICATE RESISTIVE IMPEDANCE 



Fig. 2 — Single band lattice filters employing a crystal in one arm. 



