Near carrier noise in TWT amplifiers

Abstract

and Near carrier amplitude and phase noise modu lations have been measured for low noise ( receiving type ) and medium power (20 w) TWT amplifiers at 6GHz. The measured noise is greater than predicted by the noise figure measured 30 MHz from the car rier.Below 20 kHz, at least part of the excess can be accounted for by phase modulation products coherent with the power line freCl.uency.