Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Patent
1978-04-03
1981-01-06
Griffin, Robert L.
Telecommunications
Transmitter
Measuring, testing, or monitoring of transmitter
455109, 324 77C, H04B 102
Patent
active
042440548
ABSTRACT:
For measuring the group delay of amplitude modulated transmitters a variable measurement frequency is modulated by a fixed frequency so as to obtain the sum and difference frequencies which are sent to the input of the transmitter under test; the two waves corresponding to the same side-band are obtained at the transmitter output, are frequency shifted, filtered and detected to give their beat, filtered again to obtain only the beat at a frequency twice the modulation frequency; and said beat is compared with a signal of the frequency but coherent with the modulating signal, the comparison providing a direct voltage component which is a linear function of the group delay of the side-band corresponding to the measurement frequency. The invention also concerns the apparatus for realizing the method, comprising also the known units allowing to measure the amplitude of each side band.
REFERENCES:
patent: 2635183 (1953-04-01), Smith
patent: 2952770 (1960-09-01), Downie
patent: 3337804 (1967-08-01), Palatinus
patent: 3360729 (1967-12-01), Oakatubys
patent: 3537009 (1970-10-01), Brooks
patent: 4028625 (1977-06-01), Behrend
Chin Tommy F.
Griffin Robert L.
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