Synonym flywheel effect.

Abbreviation for frequency modulation.

That form of interference to the reception of other broadcast stations, which is caused by the presence of an FM broadcast signal of 115 dB (562 mV/m) or greater signal strength in the area adjacent to the antenna of the transmitting station. The 115-dB contour is referred to as the "blanketing area. " [47CFR]

See translator.

Synonym capture effect.

See capture effect.

The quotient obtained by dividing the signal-to-noise ratio (SNR) at the output of an FM receiver by the carrier-to-noise ratio (CNR) at the input of the receiver.
Note: When the FM improvement factor is greater than unity, the improvement in the SNR is always obtained at the expense of an increased bandwidth in the receiver and the transmission path.

The point in an FM receiver at which the peaks in the rf signal equal the peaks of the thermal noise generated in the receiver.
Note: A baseband signal-to-noise ratio of about 30 dB is typical at the improvement threshold, and this ratio improves 1 dB for each decibel of increase in the signal above the threshold.

In an FM receiver, the effect produced when the desired-signal gain begins to limit the desired signal, and thus noise limiting (suppression).
Note: FM threshold effect occurs at (and above) the point at which the FM signal-to-noise improvement is measured.

A change in the value of the FM threshold of a receiver.
Note: FM threshold extension may be obtained by decreasing the operational bandwidth, thus decreasing the received noise power and allowing the threshold of the desired signal to occur at a lower signal input level.