Apparatus for and method of measuring radio frequency signals

Details Apparatus for and method of measuring radio frequency signals Apparatus for and method of measuring radio frequency signals

1976-12-30

1979-05-01

Richardson, Robert L.

325438, 325334, 325363, H04B 126

Patent

active

041526520

ABSTRACT:
Apparatus for detecting and measuring the values of radio frequency (RF) signals comprises two intermediate frequency (IF) channels having mixers fed by local oscillators (LO) with output frequencies having a predetermined frequency difference. The LO frequencies are selected to produce IFs from overlapping or coincident RF bands which are higher and lower, respectively, than the LO frequencies. The outputs of the mixers are measured in identical frequency discriminators, respectively, and the outputs of the discriminators are compared by logic circuits which determine the presence of signals in either or both of the channels and the value of the corresponding RF signal. This receiver eliminates the need for an RF preselector for the superheterodyne process and thereby broadens the RF bandwidth receiving capability of the system.
The invention also comprehends the method of determining the value of RF signals in a receiving system which consists of dividing the RF signal into two parts, mixing the first RF part from either first or second RF bands with a first LO frequency, mixing the second RF part with a second LO frequency to produce a second IF signal from either said second or a third RF band, measuring the values of the first and second IF signals in identical frequency discriminators, and comparing the outputs of the discriminators to determine from which of the first, second, or third RF bands the signal is derived, and measuring the RF value of the signal.

REFERENCES:
patent: 2692332 (1954-10-01), Godbey
patent: 3364426 (1968-01-01), Hurvitz
patent: 3540055 (1970-11-01), Takagi
patent: 3546593 (1970-12-01), Gittinger

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