Abstract

A comparison of reticle-produced amplitude- and frequency-modulated waves has been made. By calculating the power content of each component of the frequency spectrum of a modulated wave, the optimum values for the parameters of bandwidth and modulation index have been determined. It is shown that an FM system with a modulation index of 1.8 and a bandwidth encompassing only the first sideband pair exhibits the highest effective signal-to-noise ratio. Using these values of bandwidth and modulation index, the FM system exhibits a slight effective signal-to-noise superiority when compared with an AM system operating under similar conditions. The superiority of effective signal-to-noise ratio is lost if either the bandwidth or modulation index departs markedly from its optimum value. The modulation efficiency for various reticle-produced modulated waves has also been calculated.

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  1. R. O. Carpenter (private communication).
  2. H. S. Black, Modulation Theory (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1953), pp. 225–228.
  3. R. B. McQuistan, J. Opt. Soc. Am. 49, 70–74 (1959).
  4. S. Goldman, Frequency Analysis Modulation and Noise (McGraw-Hill Book Company, Inc., New York, 1948), p. 109.
  5. Cruft Electronics Staff, Electronic Circuits and Tubes (McGraw-Hill Book Company, Inc., New York, 1947), pp. 619–620.
  6. For example, see F. E. Terman, in Electronic and Radio Engineering (McGraw-Hill Book Company, Inc., New York, 1955), p. 589.
  7. See p. 151 of reference 4.
  8. H. Margenau and G. M. Murphy, The Mathematics of Physics and Chemistry (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1943), p. 116.
  9. J. R. Pierce and C. C. Cutler, "Interplanetary Communications," in Advances in, Space Science (Academic Press, Inc., New York, 1959), Vol. 1, pp. 69–71.

Black, H. S.

H. S. Black, Modulation Theory (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1953), pp. 225–228.

Carpenter, R. O.

R. O. Carpenter (private communication).

Cutler, C. C.

J. R. Pierce and C. C. Cutler, "Interplanetary Communications," in Advances in, Space Science (Academic Press, Inc., New York, 1959), Vol. 1, pp. 69–71.

Goldman, S.

S. Goldman, Frequency Analysis Modulation and Noise (McGraw-Hill Book Company, Inc., New York, 1948), p. 109.

Margenau, H.

H. Margenau and G. M. Murphy, The Mathematics of Physics and Chemistry (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1943), p. 116.

McQuistan, R. B.

R. B. McQuistan, J. Opt. Soc. Am. 49, 70–74 (1959).

Murphy, G. M.

H. Margenau and G. M. Murphy, The Mathematics of Physics and Chemistry (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1943), p. 116.

Pierce, J. R.

J. R. Pierce and C. C. Cutler, "Interplanetary Communications," in Advances in, Space Science (Academic Press, Inc., New York, 1959), Vol. 1, pp. 69–71.

Terman, F. E.

For example, see F. E. Terman, in Electronic and Radio Engineering (McGraw-Hill Book Company, Inc., New York, 1955), p. 589.

Other (9)

R. O. Carpenter (private communication).

H. S. Black, Modulation Theory (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1953), pp. 225–228.

R. B. McQuistan, J. Opt. Soc. Am. 49, 70–74 (1959).

S. Goldman, Frequency Analysis Modulation and Noise (McGraw-Hill Book Company, Inc., New York, 1948), p. 109.

Cruft Electronics Staff, Electronic Circuits and Tubes (McGraw-Hill Book Company, Inc., New York, 1947), pp. 619–620.

For example, see F. E. Terman, in Electronic and Radio Engineering (McGraw-Hill Book Company, Inc., New York, 1955), p. 589.

See p. 151 of reference 4.

H. Margenau and G. M. Murphy, The Mathematics of Physics and Chemistry (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1943), p. 116.

J. R. Pierce and C. C. Cutler, "Interplanetary Communications," in Advances in, Space Science (Academic Press, Inc., New York, 1959), Vol. 1, pp. 69–71.

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