# What are FM waves?

## What are FM waves?

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.

How do you calculate frequency modulation?

The frequency modulation is known as a constant bandwidth system and an example of this system is given below.

1. Δf = 75 KHz fm = 500 Hz BWFM = 2 [75 + (500/1000)] KHz = 151.0 KHz.
2. Δf = 75 KHz fm = 5000 Hz BWFM = 2 [75 + (5000/1000)] KHz = 160.0 KHz.
3. Δf = 75 KHz fm = 10000 Hz BWFM = 2 [75 + (10000/1000)] KHz = 170.0 KHz.

### What is the deviation ratio of the FM broadcast band?

One common example of the FM deviation ratio can be seen by taking the figures for a typical FM broadcast station. Fir these stations the maximum frequency deviation is ±75 kHz, and the maximum audio frequency fort he modulation is 15 kHz. Using the formula above, this means that the deviation ratio is 75 / 15 = 5.

What is narrow band FM?

Narrow Band FM is a FM signal that only uses a small portion of a normal FM channel. Narrowband FM mainly used in two-way wireless communications. View All Products.

## How long is an FM radio wave?

Radio waves have a wavelength of about two or three meters. Remember that two meters is about the size of a human being. An FM station broadcasting at 90 MHz is broadcasting at a wavelength of 3.3 meters.

What is FM deviation?

Frequency deviation in FM is defined as the way to describe the difference between the minimum and maximum extent of a frequency modulated signal and the carrier frequency.

### How wide is narrow band FM?

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 wide band FM?

Wideband FM is defined as the situation where the modulation index is above 0.5. Under these circumstances the sidebands beyond the first two terms are not insignificant.

## How long is a radio wave in meters?

Radio waves have a wavelength of about two or three meters. Remember that two meters is about the size of a human being. An FM station broadcasting at 90 MHz is broadcasting at a wavelength of 3.3 meters. Visible light is at about 0.0000006 meters or 600 nm.

How can I make FM signal?

FM signals can be generated either by using direct frequency modulation, which is achieved by inputting a message directly into a voltage-controlled oscillator, or by using indirect frequency modulation, which is achieved by integrating a message signal to generate a phase-modulated signal, which is then used to …

### What is FM modulation explain with mathematical expression?

Mathematical Representation This is the equation of FM wave. If the modulating signal is m(t)=Amcos(2πfmt), then the equation of FM wave will be. s(t)=Accos(2πfct+βsin(2πfmt))