How does modulation work? Communications Systems. How do repeater systems work? Analog Different types of radio How does trunking work? Final assessment. Return to Basic Radio Awareness. Register for Radio Academy Register for the Radio Academy to: keep track of your course progress, download the course study guide, ask and answer questions in the forums, earn a certificate at the end of the course.
P25 Best Practice Guides. Supported by. Cookies This site uses both functional cookies and tracking cookies to help us understand how users interact with the site. By tapping the terminals of a 9-volt battery with a coin, you can create radio waves that an AM radio can receive!
Take a fresh 9-volt battery and a coin. Find an AM radio and tune it to an area of the dial where you hear static. Now hold the battery near the antenna and quickly tap the two terminals of the battery with the coin so that you connect them together for an instant. You will hear a crackle in the radio that is caused by the connection and disconnection of the coin.
A Slightly More Elaborate Radio If you want to get a little more elaborate, use a metal file and two pieces of wire. Radio Basics: The Parts As seen in the previous section, it is incredibly easy to transmit with static. Any radio setup has two parts: Advertisement. The transmitter The receiver. Radio Basics: Real-life Examples " ". A typical baby monitor, with the receiver on the left and the transmitter on the right: The transmitter sits in the baby's room and is essentially a mini "radio station.
Typical transmission distance is limited to about feet 61 m. Simple Transmitters " ". The battery creates electron flow in the first wire. The moving electrons create a magnetic field around the wire. The magnetic field stretches out to the second wire. Electrons begin to flow in the second wire whenever the magnetic field in the first wire changes.
Simple Transmitters: Make Your Own " ". When you connect the battery, the voltage in the wire is 1. By connecting and disconnecting a battery quickly, you create a square wave that fluctuates between 0 and 1. A sine wave fluctuates smoothly between, for example, 10 volts and volts.
Transmitting Information " ". Receiving an AM Signal " ". Unless you are sitting right beside the transmitter, your radio receiver needs an antenna to help it pick the transmitter's radio waves out of the air. An AM antenna is simply a wire or a metal stick that increases the amount of metal the transmitter's waves can interact with.
Your radio receiver needs a tuner. The antenna will receive thousands of sine waves. The job of a tuner is to separate one sine wave from the thousands of radio signals that the antenna receives.
In this case, the tuner is tuned to receive the ,hertz signal. Tuners work using a principle called resonance. That is, tuners resonate at, and amplify, one particular frequency and ignore all the other frequencies in the air. It is easy to create a resonator with a capacitor and an inductor check out How Oscillators Work to see how inductors and capacitors work together to create a tuner. The tuner causes the radio to receive just one sine wave frequency in this case, , hertz.
Now the radio has to extract the DJ's voice out of that sine wave. This is done with a part of the radio called a detector or demodulator. In the case of an AM radio, the detector is made with an electronic component called a diode. A diode allows current to flow through in one direction but not the other, so it clips off one side of the wave, like this:. The radio next amplifies the clipped signal and sends it to the speakers or a headphone. The amplifier is made of one or more transistors more transistors means more amplification and therefore more power to the speakers.
The Simplest AM Receiver " ". Part number will do. Two pieces of wire - You'll need about 20 to 30 feet 15 to 20 meters of wire. Radio Shack part number is great, but any wire will do. A small metal stake that you can drive into the ground or, if the transmitter has a guard rail or metal fence nearby, you can use that A crystal earphone - Unfortunately, Radio Shack does not sell one.
Drive the stake into the ground, or find a convenient metal fence post. This is the ground wire. Attach the diode to the other end of the ground wire.
Take another piece of wire, 10 to 20 feet long 3 to 6 meters , and connect one end of it to the other end of the diode. This wire is your antenna.
Lay it out on the ground, or hang it in a tree, but make sure the bare end does not touch the ground. Connect the two leads from the earplug to either end of the diode, like this:. Antenna Basics You have probably noticed that almost every radio you see like your cell phone, the radio in your car, etc.
Antenna: Real-life Examples Let's say that you are trying to build a radio tower for radio station AM. Originally Published: Dec 7, You can listen to radio on your computer, though it is streamed digitally via your internet connection. Search online for your favorite station to see if you can tune in from its website. If you aren't sure what the station is called or would rather browse a variety of stations, check out www. Can I listen to radio on my phone? Some radio stations have their own apps for listening via smartphone.
The TuneIn app is a great way to browse and listen to popular radio stations. Is the radio dead? There's quite a bit of debate about whether radio is on it's way out or not.
Streaming music has provided some steep competition to traditional radio. However, if you look at something like Apple's popular Apple Music 1, it appears that perhaps the format of radio is just changing and not people's consumption of it.
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An alternate name of an Ethernet transceiver is MAU media access unit. This is used in the specifications of IEEE In the ISO network model, Ethernet is the physical layer component and the main functions of transceivers are for detecting a collision, conversion of digital data, Ethernet interface processing, and provides access for the network.
A wireless transceiver is an essential component in the wireless communication system and the quality of this can be determined by the efficiency as well as data delivery within the wireless system.
The physical layer includes an RF front end as well as a baseband processor, this processor changes a bitstream to a collection symbol flow for data transmission.
Thus, this is all about an overview of the transceiver. This may vary from one application to another. In a local area network, a network interface card includes a transceiver that transmits the signals on the wire and also notices the signals. In radio communication, the communication is in two ways, where the data can be exchanged in a half-duplex mode. Here is a question for you, what are the Functions of transceiver? Share This Post: Facebook.
What is Mutual Inductance and Its Theory.
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