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THE BELL SYSTEM TECHNICAL JOURNAL, OCTOBER 1951 



The RF and IF power meter consists of a temperature compensated 

 thermistor bridge unit. It has separate input arrangements for the 3700 to 

 4200-megacycle and 50 to 90-megacycle bands. Accurate measurements of 

 power may be made in the range from — 10 dbm to +6 dbm. 



The test bay used at maintenance centers has, in addition to the above 

 equipment, a 50- to 90-megacycle swept frequency oscillator and associated 

 detectors for the testing of intermediate frequency components. The opera- 



Fig. 19 — FM terminal test console. 



tions carried out at the maintenance center include the repair and realignment 

 of defective equipment returned from the radio stations. The maintenance 

 center test equipment includes facilities for accurate impedance match 

 measurement in the microwave and IF range, for varistor matching tests, 

 vacuum tube transconductance tests and general component tests which 

 cannot be made at the radio station. Usually the maintenance centers are 

 operated by the same staff that maintains the radio stations in the section. 



