Intermediate frequency slope compensation control arrangements

Details Intermediate frequency slope compensation control arrangements Intermediate frequency slope compensation control arrangements

H - Electricity

04

B

325/87

H04B 1/16 (2006.01) H04B 7/005 (2006.01)

Patent

CA 1181817

INTERMEDIATE FREQUENCY SLOPE COMPENSATION CONTROL ARRANGEMENTS Abstract of the Disclosure In a microwave digital radio transmission system receiver in which a modulated carrier wave is converted to an I.F. signal which is demodulated to produce phase quadrature signals, an apparent frequency error of the carrier wave is detected from the phase quadrature signals and used to control means, such as an I.F. amplitude equalizer, for compensating for amplitude slope of the I.F. signal. A control signal is produced by low pass filtering a product of one phase quadrature signal with the time differential of the other, or the difference between the products of each phase quadrature signal with the time differential of the respective other phase quadrature signal. - i -

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