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What does a.m. stand for in radio


What does A.M. stand for in radio? You may have heard the term AM, or AM radio, but if you’re not familiar with broadcast band frequencies and other radio terminology, it can be confusing. In this guide to what A.M. stands for in radio, we’ll explain everything you need to know about broadcast band frequencies—from what frequency goes into a transmitter at one end and comes out at the other end as a powerful signal that any AM receiver can pick up within range of its transmitter’s power output capability—and how they work together to put us in touch with our favorite programs and shows whenever we want them on demand (or even live). So grab your morning coffee while I walk you through everything there is to know about our favorite kind of wireless technology!

What does a.m. stand for in radio

what does a.m. stand for in radio

AM stands for amplitude modulation, which is a form of modulation used in radio transmission. Amplitude modulation is the most common type of radio transmission and it’s used to send and receive both voice communication and music from AM stations.

The letter A in AM can also refer to all-encompassing, as in the phrase “am radio.” Engineers coined this term at RCA who were trying to improve their broadcasts by increasing their range beyond line-of-sight distances between transmitter and receiver. The solution? Increase frequency range so that more information could be transmitted through airwaves; this also meant creating higher frequencies than those on which other types of electromagnetic waves like microwaves operate (where as microwaves have frequencies ranging anywhere between 300MHz – 30GHz).

what is the frequency range of am radio

The AM broadcast band is the standard medium wave (MF) frequency band in most countries for AM radio broadcasting. In North America, the band ranges from 525 to 1705 kHz. In Europe and other countries, it is 9 kHz wider at 531 to 1602 kHz. The band was expanded by adding the top section of frequencies on one side of the spectrum. Radio waves in this band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere. This allows long-distance AM broadcast stations to radiate beyond the horizon, around curves in the Earth’s surface, and over hills and mountains.

The official frequency range for commercial AM broadcasting is 530 kHz to 1710 kHz, with tolerance of ±5 kHz. The FCC rules allow stations to deviate from these frequencies under certain conditions. In some other countries including Japan, Australia, New Zealand and Mexico, these upper sideband frequencies are used for FM radio broadcasting. This frequency range encompasses both medium wave as well as longwave broadcasting in those countries.

The answer to this question is simple: it’s a range of 535 kHz to 1 MHz. Let’s break down what that means, so you can understand how AM broadcasting works.

AM radio uses two bands in its broadcast frequencies. The first band has a lower frequency limit of 525 kHz and an upper frequency limit of 1 MHz; it is also sometimes referred to as the longwave band. The second band begins with 535 kHz and ends at 1 MHz; this part is called shortwave or high frequency (HF) due to its higher-quality signals over longer distances than those used by shortwave radios.

How AM radio transmitter works

The AM radio transmitter consists of a high-frequency oscillator, a modulator and an antenna. The high-frequency oscillator provides the carrier signal and the modulator converts it into a modulated waveform.

The modulated waveform is then amplified by the power amplifiers and transmitted through the antenna.

The carrier signal is generated by a high-frequency oscillator. The frequency of this oscillator is much higher than the amplitude modulation frequency of the audio signal. For example, if the audio signal is to be transmitted at 15 KHz, then the frequency of the carrier should be around 15 MHz (one million).

The amplified output from this oscillator is fed to an amplifier stage which increases its amplitude by several orders of magnitude before feeding it to a mixer stage. Here, it is mixed with another signal known as local oscillator (LO) which has exactly same frequency as that of carrier but with inverted phase relationship. This results in generation of sum and difference frequencies between these two signals.

The first step in the process is to modulate a high frequency carrier wave. This is done by using the diaphragm of a microphone to vibrate at audio frequencies, which creates an electrical current that varies in amplitude and frequency according to the sound waves impinging on it. The modulated signal is then amplified and coupled to an antenna for transmission through free space or through coaxial cable as in shortwave broadcasting.

How Far do A.M radio waves go?

A.M. Radio waves travel through the atmosphere, through the earth and through the ocean. This is called ground wave propagation and it’s how AM radio stations can be heard so far away from their transmitter site.

The farther away you are from an AM station, the weaker its signal will be because there is more atmosphere between you and where it’s transmitting (the farther away). Also, if there is another AM radio station between you and your desired station, then some of its signal will also reach your receiver which reduces your ability to hear only one station at a time

Why Choose A.M over F.M

AM stands for amplitude modulation. It is a transmission method that uses the amplitude of a signal to represent the audio or data being transmitted. The signal amplitude can be increased in order to encode information, by increasing the signal strength, which is called modulation. The frequency remains constant, but the absolute value of it changes as well as its phase (the position of its peaks and troughs). Amplitude modulated signals are much more robust than FM signals because they do not need such a wide range of frequencies – AM transmissions can travel over long distances without any degradation or interference whereas FM signals break up when they travel too far from their station’s transmitter site so that only local listeners can hear them clearly.”

Vacuum tube transmitters

Vacuum tube transmitters are older than solid-state transmitters. They were used in the 1950s and 1960s, but they’re still around today. Vacuum tube transmitters are more expensive than solid-state transmitters, but they’re much easier to repair if you have the right parts on hand.

The main advantage of a vacuum tube transmitter is its ability to generate higher power output than a solid-state transmitter. It also has better audio quality and lower harmonic distortion. This can be helpful if you need an antenna with a high gain or if your radio station needs a stronger signal from its tower site because it serves over 50 miles away from where it’s located at any given time (and therefore suffers from weak signals).

The decline in popularity of A.M Radios

The number of people listening to the radio has been steadily declining for the past 20 years. The main reason for this is that people are using their mobile phones and iPods to listen to music instead.

The first reason for this decline is the cost of owning an AM Radio. They are expensive compared to other types of radios, especially if you want a good quality one. It can cost up to $500 dollars just to buy a new one, which is far too expensive for most people’s budgets these days.

Another reason why AM radios are on the decline is because they don’t have any special features like other types of radios do. They don’t have built-in speakers or screens, which means that you can only hear what is being played through your headphones or earbuds. This makes them less appealing than other types of radio because people like having a visual display as well as an auditory one when they use their devices.

AM stereo and AMAX standards

AM stereo and AMAX standards are methods of broadcasting stereophonic sound by amplitude modulation (AM) of a carrier wave with two separate audio channels, which a stereo receiver can decode. The former is defined in the United States as ANSI/BTSC A53, while EIA-619-A defines the latter. In the United States, an AMAX transmitter has to broadcast one channel on its left (upper side) and another on its right (lower side). In Europe and Australia, this standard is called DRM+ or DAB+.

Broadcast band frequencies

Broadcast band frequencies are the frequencies used by broadcast radio stations in the medium wave and long wave bands. Broadcast band frequencies are used to transmit audio, video, and data to homes and businesses.

For example, you can listen to broadcast band frequencies on your car radio if you have an AM/FM tuner that can pick up these signals.


A.M stands for amplitude modulation, and it’s one of the two main ways to transmit sound through radio waves. A transmitter sends an audio signal that modulates the amplitude of a carrier wave by varying its intensity over time. The receiver uses this information to recreate the source device’s original sound waves like speakers or headphones.

In the end, it’s probably a matter of preference. After all, many people hear the term “AM radio” and immediately think about classic talk radio shows. Before deciding if you want to use “AM” or another abbreviation, it’s best to be aware of what these terms stand for. Then you can make your own decision on which one is best for your site.

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