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# What is narrowband frequency modulation?

## What is narrowband frequency modulation?

A narrow band FM is the FM wave with a small bandwidth , The modulation index mf of narrow band FM is small as compared to one radian . Hence, the spectrum of narrow band FM consists of the carrier and upper sideband and a lower sideband .

How is narrow band FM generated?

To generate the narrowband FM signal, we will be using the standard equation of the FM signal and pass the value of the frequency modulation index (b) less than unity.

What are the characteristics of narrow band FM?

Narrow band FM has the characteristics: The bandwidth of the FM signal depends upon the frequency sensitivity kf. When kf is small, the bandwidth of the FM signal becomes narrow and this is known as Narrow Band FM signal. The bandwidth of a narrowband FM signal is almost same as that of an AM signal.

### What is narrow band and wide band FM?

Narrow Band FM. Wide Band FM. 1. Modulation index is less than 1. Modulation index is greater than 1.

What is the differences between narrow band and wide band FM?

Distinguish between narrowband and wideband FM….Are you afraid of programming interviews?

Sr No. Narrow Band FM Wide Band FM
4 Bandwidth = 2fm Bandwidth 15 times NBFM, Bandwidth = 2(δ+fmmax)
5 Maximum modulation index is slightly greater than 1 Maximum modulation index between 5 to 2500

What is the bandwidth of narrow band FM?

Narrowband FM Signals. Narrowband FM is commonly used in Amateur Radio in the 144–148 MHz VHF band and the 420–450 MHz UHF band, where the bandwidth required for the FM signal is acceptable.

#### What is narrow band analysis?

The narrow-band analysis is performed by the computer program that transforms the data while transmitting it from the analyser into the computer. The technique simulates a 2 3 – octave-band tracking filter and thus eliminates overtones of the signal and part of the background noise.

Where are narrow bands used?

Narrowband radio channels are typically used for shorter-range, fixed-location wireless applications, such as radio-frequency identification (RFID) and commercial vehicle remote keyless entry (RKE) devices.

What is narrow-band frequency modulation?

Narrow-band Frequency Modulation KEEE343 Communication Theory Lecture #16, May 3, 2011 Prof. Young-Chai Ko [email protected] Summary ìNarrowbandFrequencyModulation ìWidebandFrequencyModulation Narrow-Band Frequency Modulation •Narrow-Band FM means that the FM modulated wave has narrow bandwidth.

## What is narrow band FM?

Narrow-Band Frequency Modulation •Narrow-Band FM means that the FM modulated wave has narrow bandwidth. •Consider the single-tone wave as a message signal:

What is amplitude distortion of narrow-band FM?

Amplitude Distortion of Narrow-band FM •Ideally, FM wave has a constant envelope •But, the modulated wave produced by the narrow-band FM differ from this ideal condition in two fundamental respects: •The envelope contains a residual amplitude modulation that varies with time

What is modulation in FM?

Modulation. This is used to modulate a crystal-controlled oscillator, and the result is passed through a frequency multiplier to produce an FM signal. In this modulation, narrowband FM is generated leading to wideband FM later and hence the modulation is known as indirect FM modulation.