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What is RF modulator

An RF modulator (or radio frequency modulator) is an electronic device whose input is a baseband signal which is used to modulate a radio frequency source. RF modulators are used to convert signals from devices such as media players, VCRs and game consoles to a format that can

Posted on:08-08 View:1979
What is Modulation

Modulation is usually applied to electromagnetic signals -- radio, lasers/optics and computer networks. Modulation can even be applied to direct current (which can be treated as a degenerate carrier wave with amplitude 0 and frequency 0) mainly by turning it on and off (as in Morse code telegra

Posted on:08-07 View:1231
Medium range transmitter

This is a medium range transmitter circuit diagram. This is also improved by changing the values of the resistor. Circuit diagram

Posted on:08-07 View:298
Dipole antenna basics

As the name suggests the dipole antenna consists of two terminals or "poles" into which radio frequency current flows. This current and the associated voltage causes and electromagnetic or radio signal to be radiated. As seen the antenn

Posted on:07-29 View:549
How to build a 3W FM Transmitter

Description This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn't so bad, a PLL can be used on this circuit. This is a circuit that I've build a few years ago for a friend, who used

Posted on:07-29 View:1586
How to Make an Indoor FM Antenna

FM radio listeners may find that the antenna that comes with their radios is not sufficient to clearly hear their favorite songs and programs. Commercially available antennas can be very expensive compared to the cost of building one yourself. You can build your own FM radio antenna using a few

Posted on:07-28 View:457
Quality Stereo Wireless Microphone or Audio Link

Complete Project: Description This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but t

Posted on:07-28 View:1841
The UnFETtered Crystal Radio

Introduction Several weeks ago I became aware, via the Internet, of an experimental AM 'crystal set' style of receiver, that uses what is known as a ZVB (Zero Voltage Bias) device. This is in the form of an IC, which contains either a 2 pack or 4 pack of specialised FETs (Field Effec

Posted on:07-27 View:2318
What is the Best Materials to Make a TV Antenna

Antennae are fascinating tools that can be used to explore the reaches of space through receiving wavelengths. Most commonly, however, antennae are used in the home to pick up and improve a television or radio signal. The size, shape and placement, along with the material it is constructed from

Posted on:07-27 View:3692
Transmitter FM 45W with valve

TECHNICAL CHARACTERISTICS: 1.Tendency of catering: 220V AC 2.Frequency of emission at FM: 88~108MHz 3.Force of expense: max 45W (without the R3) Circuit diagram Materially: 1.R1 15KW/2W 2.R2 1KW/10W

Posted on:07-25 View:5874

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