198 



BELL SYSTEM TECHNICAL JOURNAL 



^W^ 



i 



-^M^ 



lliiii 



I — 1 1 — 1 1 — 1 1 — II — II — I 



TTTTTT 



^ = 



■^ 



nrmiTTTTi 



I — 1 1 — II — 1 1 — II — I it::=t I — 1 1 — 1 1 — II — 1 1 — I 



TTTjTTTTLTTT 



^ 



llliii 



I — 1 1 — 1 1 — 1 1 — 1 1 — 1 1 — I 



TTTTTT 



TTTTll 



I — 1 1 — 1 1 — 1 1 — II — II — I 



TTTTTT 



■^ 



% 



rTTmrTTm 



I 1 I II I I 1 I 1 rj:: :i= I 1 (=1 1=1 [=1 (^^ 



ttT,Tttttt,ttj 



■^Ir 



ilTTlT 



I — 1 1 — 1 1 — II — 1 1 — 1 1 — I 



TTTTTT 



■vGM^ 



1^ 



■vM^ 



Fig. 1 — Schematic of the channel selecting crystal band pass filter as constructed. 



