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Phase Effects in Cross-Modulation

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1 Author(s)
Gumm, P. ; Tektronix, Inc.

CATV amplifiers can convert amplitude cross-modulation into phase cross-modulation. It has been generally assumed that this is desirable. A theory is developed and checked experimentally that shows that the fm deviations caused by the phase shifts are visible in television receivers. If the phase shift exhibits a rise time of about 100 ns or less, phase cross-modulation and amplitude cross-modulation are equally visible if the sidebands of the two modulation processes are equal for a 15 kHz squarewave. The visibility of the phase cross-modulation is rise-time dependent, showing a 12 dB decrease in visibility as the rise time is lengthened to about 300 ns.

Published in:

Cable Television, IEEE Transactions on  (Volume:CATV-1 ,  Issue: 1 )

Date of Publication:

Oct. 1976

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