CROSSMODULATION IN TRAVELING WAVE TUBES.
CHALMERS UNIV OF TECHNOLOGY GOTEBORG (SWEDEN) RESEARCH LAB OF ELECTRONICS
Pagination or Media Count:
Measurements of crossmodulation effects in a commercial medium power S-band TWT are reported. The tube was fed with two simultaneous monochromatic input signals of frequencies 2.15 and 3.80 GHz. The relations between the crossmodulation and the nonlinear distortion with only one of the signals present are investigated and are found to be in very good agreement with a theoretical analysis. For the two signal case the nonlinear amplitude and phase distortions in various representations compression, AM-to-PM crossconversion etc. are given as functions of parameters like the helix voltage and the output power. It is confirmed that a low helix voltage gives low AM-to-PM conversion and low AM-to-PM crossconversion, while a high helix voltage gives a good amplitude linearity, i.e. low compression and amplitude crossmodulation. Author
- Electrical and Electronic Equipment