Journal ArticleDOI
FM demodulators with negative feedback
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TLDR
In this paper, the FM receiving demodulators used in the Echo experiment were described in terms of negative feedback applied to the local oscillator to reduce the FM modulation index in the receiver intermediate frequency amplifiers.Abstract:
The FM receiving demodulators used in the Echo experiment are described in this paper. These receivers have negative feedback applied to the local oscillator to reduce the FM modulation index in the receiver intermediate frequency amplifiers. This technique results in a threshold performance which is superior to that of a conventional FM receiver.read more
Citations
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Journal ArticleDOI
Decreasing the Threshold in FM by Frequency Feedback
TL;DR: In this paper, it was shown that the stability of the feedback loop of a feedback demodulator is a function of the modulation, but that by following the procedure given, the effect can be almost entirely eliminated.
Journal ArticleDOI
Theoretical Studies on Signal-to-Noise Characteristics of an FM System
TL;DR: In this paper, the essential signal-to-noise characteristics of an FM system are studied theoretically, assuming that the transmitted wave is frequency-modulated by a discontinuous signal, which is made by sampling from the original information signal at every sampling point equally spaced by a Nyquist interval and by boxcarring the sampled value over the following interval.
Journal ArticleDOI
The FM demodulator with negative feedback
A. J. Giger,J. G. Chaffee +1 more
TL;DR: In this article, the authors describe the design and theory of operation of the wideband FM demodulator with feedback (FMFB receiver) used at the Andover, Maine, earth station for Telstar satellite communications tests.
Journal ArticleDOI
A simple formula for the threshold characteristics of FM signals
O. Shimbo,C. Loo +1 more
TL;DR: A simple formula for calculating the output S/N of an FM signal demodulated by an FM discriminator is obtained and it is shown that the authors' formula should be used rather than that of the click theory.
Journal ArticleDOI
Design and Performance of a Broad-Band FM Demodulator with Frequency Compression
Clyde L. Ruthroff,W. F. Bodtmann +1 more
TL;DR: In this article, a broad-band FD demodulator is proposed for use in an intercontinental satellite communication system and is suitable for either television or telephone service, where the FD circuit details, performance data, and a measured comparison with FM are presented.
References
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Journal ArticleDOI
Statistical properties of a sine wave plus random noise
TL;DR: A number of statistical properties of such a current which consists of a sinusoidal component plus a random noise component are given here.
Journal ArticleDOI
The application of negative feedback to frequency-modulation systems
TL;DR: In this article, negative feedback is applied to a frequency-modulation receiver of superheterodyne type by causing a portion of the output voltage to frequency modulate the local oscillator in such phase as to reduce the output signal.
Journal ArticleDOI
Frequency-modulation: Theory of the feedback receiving circuit
TL;DR: This paper may be regarded both as a continuation of a prior one by the writer and Thornton C. Fry and as a companion of that by J. G. Chaffee the inventor of the circuit under consideration.
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Amplitude modulation suppression in FM systems
TL;DR: A limiter analysis in terms of low-index modulation theory proves the possibility of perfect amplitude modulation suppression with small loss to the frequency modulated signal.