Automatic aerial attenuator

Details Automatic aerial attenuator Automatic aerial attenuator

1975-11-06

1977-08-02

Safourek, Benedict V.

325383, 325387, 325474, H04B 106

Patent

active

040399532

ABSTRACT:
A transmission system receiver compares the received signal power in a relatively narrow frequency band with the received signal power in a relatively wide frequency band, which embraces the narrow frequency band, to obtain an indication of the "SINAD ratio" which refers to the signal plus noise plus distortion to noise plus distortion ratio. The receiver also includes an automatic control system for comparing the indication with a reference and for adjusting an attenuator in response to disparity between the indication and the reference in a sense to increase the SINAD ratio above a predetermined level, or to adjust the SINAD ratio to an optimum value.

REFERENCES:
patent: 3206679 (1965-09-01), Miller
patent: 3622891 (1971-11-01), Leland
patent: 3769591 (1973-10-01), Brown et al.
patent: 3953802 (1976-04-01), Morris et al.

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