Telecommunications – Receiver or analog modulated signal frequency converter – Panoramic display
Patent
1979-04-10
1980-08-05
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Panoramic display
324 77B, 455246, H04B 136, H04B 1700
Patent
active
042164290
ABSTRACT:
A frequency-modulated ultrashort-wave signal is received, but due to wave-reflection phenomena from physical bodies reflecting towards the receiving antenna is amplitude modulated, this amplitude modulation being dependent upon frequency. An amplitude-indicating signal and a frequency-deviation signal are derived from the received frequency-modulated signal and, instead of merely being applied to the x- and y-deflection inputs of an oscilloscope for partly subjective analysis by a skilled analyst, are applied, preferably via low-pass filters, to first and second differentiators, the two output signals of which are transmitted to a divider which produces a differential-quotient signal indicating the rate of change of the amplitude of the frequency-modulated signal with respect to the frequency deviation of the frequency-modulated signal. The differential-quotient signal is applied to an extreme-value-responsive indicator, whose read-out constitutes a direct quantitative measure of reception quality which can be used, for example, to automatically steer the receiving antenna.
REFERENCES:
patent: 2738417 (1956-03-01), Hunt et al.
patent: 3107330 (1963-10-01), Hausen
patent: 3283257 (1966-11-01), Boyce
patent: 3495176 (1970-02-01), Egan
Bookbinder Marc E.
Richard Hirschmann Radiotechnisches Werk
Striker Michael J.
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