Operational experience with a split channel 50 mc system

Operation on 20 kc spacing during special tests has been successful. Also, beginning early in 1949, extensive field operation of several thousand narrow band unite on a 40 kc spacing has indicated t h a t narrow band equipment itself presents no problems of performance, maintenance or interchangeability with wide band. However, operation of narrow band systems on a 40 kc spacing does not necessarily indicate the results of operating for extended periods on 20 kc spacing.