Radio

Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by a radio receiver connected to another antenna. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location. In radio navigation systems such as GPS and VOR, a mobile receiver receives radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device.

Main Content

FM Stereo Radio Receiver with RDS

“This tuner circuit is a quick prototype which I built to test the RDA5807M FM radio tuner IC. RDA5807M is a single-chip tuner IC with RDS and MPX decoder, and it equipped with I2C interface for control. The main reason …

Mod My Pirate Radio

“This Instructable shows how to modify Pimoroni’s excellent Pirate Radio kit to add an enclosure and switches that you can use to control the Pirate Radio functions. https://shop.pimoroni.com/products/pirate-radio-pi… The kit shown in this Instructable …

Compressing Radio Signals

“Hello again with a new chapter of domotics. This will be very brief in order to finish the idea on how to clone and prepare to send signals between arduinos. In this case we are not going to normalize the …

One Transistor FM Transmitter

“This circuit is basically an oscillator which runs at around 100 MHz. The most important parts of the oscillator are the transistor Q1 and the tuned circuit, which comprises the inductor Ll and the variable capacitor CV1. When the battery …

Creating a 2m Fm Repeater with a Raspberry Pi (B) and a RTL dongle

“For the purpose of this configuration I expect your Raspberry pi to be connected to the internet. How will this repeater work. This configuration was done with the latest Raspbian Os for Raspberry Pi downloaded from here https://www.raspberrypi …

How to make a 2 mile, long range FM Transmitter

“Here we are presenting a long range one that can cover a reasonable distance of 2 miles and beyond with a one watt RF power with full circuit details,bill of material and testing procedure. A simple FM transmitter (like …

TEA5767 FM Radio With Digital Volume (2)

“This version of FM radio with TEA5767 with digital volume use Arduino Uno development board instead Arduino Mega like in previous artilce. Digital volume in 15 steps is made with MCP4261-502E/P dual digital potentiometer who work as real …

Simplest FM Transmitter

“This is the simplest fm transmitter circuit you can ever find on internet,because so many simple transmitters (they call it simple but many of them dont work!) on internet will not work as those circuits are designed poorly. i …

The Ultimate FM Transmitter (Long Range Spybug)

“Have you ever wanted to broadcast your own radio station within your neighborhood? Ever get curious on where people get those “Surveillance Bugs” from spy and action movies? This small and simple FM transmitter is the toy that geeks have …

The simplest FM transmitter… Without coil/inductor

“I made this project three years ago, and it works perfectly. I have found the circuit of this project in a book I bought eighteen years ago when I was in high school. Most of the available FM transmitter circuits …