IMI'EDANCK HlUnCJKS F()l{ M K(i A( 'Y< LK KAN'GE 



1003 



was o])taincd over most of the ranjie plottinl on the I'eactaiico chart. 

 These bridges have been very successful foi- the pui-pose foi- wiiicli they 

 were designed, l)ut they ai-e not useable up to th(> eight megacycles 

 oi- highei' i-e(|uii-(Ml l)v the \/A system. 



REQUIREMENTS OF BRIDGES FOR l3 SYSTEM 



When the L3 system was contemplated, it was evident that new ))ii(lges 

 would l)e needed. It was recjuired to be able to measure virtually any 

 impedance value at frecjuencies up to and beyond the second harmonic 

 of the 8.4 megacycle upper limit of the system. Accoi'diiigly, a top 



0.01 0.05 0.1 1 3 10 

 FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 3 — Reactance/freciueiicy chart showing tlio mfa.surcmciil ratifjc of tlie 

 bridges shown in Fig. 1. 



