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Transmitter & Receivers

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  1. SKU: AHD-TRX31

    1.2G 8 CH 800mW Wireless Audio Video A/V transmitter Kit

    .2G 8 CH 800mW Wireless Audio Video A/V transmitter Kit Learn More
    $57.50
  2. SKU: AHD-TRX11

    Mini 8CH 5.8G 2000mW Wireless Transmitter & Receiver Kit For FPV Use

    ini 8CH 5.8G 2000mW Wireless Transmitter & Receiver Kit For FPV Use Learn More
    $75.00
  3. SKU: AHD-TRX10

    5.8G 500mW 8CH Video Audio FPV Wireless Transmitter and Receiver Kit

    .8G 500mW 8CH Video Audio FPV Wireless Transmitter and Receiver Kit Learn More
    $77.00
  4. SKU: AHD-TRX09

    200mW 5.8G 8CH Video Audio FPV Wireless Transmitter and Receiver Kit

    00mW 5.8G 8CH Video Audio FPV Wireless Transmitter and Receiver Kit Learn More
    $72.00
  5. SKU: AHD-TRX08

    Wireless Audio Video CCTV Receiver Transmitter 1.2G 15CH 700MW

    ireless Audio Video CCTV Receiver Transmitter 1.2G 15CH 700MW Learn More
    $62.00
  6. SKU: AHD-TRX07

    2.4G Wireless Video Audio Transmitter Receiver Kit 700mw 12CH

    .4G Wireless Video Audio Transmitter Receiver Kit 700mw 12CH Learn More
    $88.00
  7. SKU: AHD-TRX06

    2.4G 12CH 2W Wireless Transmitter/Receiver Kit for Camera DVD TV

    .4G 12CH 2W Wireless Transmitter/Receiver Kit for Camera DVD TV Learn More
    $83.50
  8. SKU: AHD-TRX05

    1.2GHz Wireless Video/Audio Transmitter/Receiver Kit 2.5W

    .2GHz Wireless Video/Audio Transmitter/Receiver Kit 2.5W Learn More
    $85.00
  9. SKU: AHD-TRX04

    1.2G Wireless 8-CH 800mW Double Room To Room Audio/Video Sender FOX-800A

    .2G Wireless 8-CH 800mW Double Room To Room Audio/Video Sender FOX-800A
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    $68.00
  10. SKU: AHD-TRX03

    Wireless Audio + Video Transmission System

    ireless Audio + Video Transmission System
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    $48.00
  11. SKU: AHD-TRX02

    2.4G Wireless 4-CH 2000mW Double Room To Room Audio/Video Sender

    .4G Wireless 4-CH 2000mW Double Room To Room Audio/Video Sender
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    $58.00
  12. SKU: AHD-TRX01

    Radio AV receiver - Wireless transmitting audio video with Easy installation

    adio AV receiver - Wireless transmitting audio video with Easy installation
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    $18.00
  13. SKU: AHD-TRX12

    Mini Video Audio Transmitter & Receiver 8CH 5.8G 1000mW Wireless FPV

    ini Video Audio Transmitter & Receiver 8CH 5.8G 1000mW Wireless FPV Learn More
    $78.50
  14. SKU: AHD-TRX13

    4 in 1 5.8G 8CH CCTV Security Wireless Video Audio Receiver FPV

    in 1 5.8G 8CH CCTV Security Wireless Video Audio Receiver FPV Learn More
    $235.00
  15. SKU: AHD-TRX14

    Mini Transmitter 8CH 5.8G 1000mW Wireless Video Audio for FPV

    ini Transmitter 8CH 5.8G 1000mW Wireless Video Audio for FPV Learn More
    $84.00
  16. SKU: AHD-TRX30

    1.2GHz 500mW 15CH Wireless Transmitter Receiver Kit for CCTV Camera

    .2GHz 500mW 15CH Wireless Transmitter Receiver Kit for CCTV Camera Learn More
    $65.50
  17. SKU: AHD-TRX29

    2.4G 4CH Wireless Video and Audio Receiver for CCTV Camera

    .4G 4CH Wireless Video and Audio Receiver for CCTV Camera Learn More
    $27.00
  18. SKU: AHD-TRX28

    2.5G 2.5W 4CH AV Wireless Transmitter and Receiver Kit

    .5G 2.5W 4CH AV Wireless Transmitter and Receiver Kit Learn More
    $73.00
  19. SKU: AHD-TRX22

    FPV 2.4G 1W 4CH Video Audio Wireless Mini Receiver Transmitter Kit

    PV 2.4G 1W 4CH Video Audio Wireless Mini Receiver Transmitter Kit Learn More
    $70.50
  20. SKU: AHD-TRX21

    FPV 1.2G 1W 4CH Video Audio Wireless Mini Receiver Transmitter Kit

    PV 1.2G 1W 4CH Video Audio Wireless Mini Receiver Transmitter Kit Learn More
    $69.00
  21. SKU: AHD-TRX20

    8CH 2.4G 2W Wireless Transmitter and Receiver Kit for Camera TV FPV

    CH 2.4G 2W Wireless Transmitter and Receiver Kit for Camera TV FPV Learn More
    $75.50
  22. SKU: AHD-TRX19

    5.8G 1200mW 9CH Wireless AV Transmitter & Receiver FPV

    .8G 1200mW 9CH Wireless AV Transmitter & Receiver FPV Learn More
    $74.00
  23. SKU: AHD-TRX18

    2.4G 500mW 8CH Wireless FPV AV Transmitter and Receiver Kit

    .4G 500mW 8CH Wireless FPV AV Transmitter and Receiver Kit Learn More
    $70.00
  24. SKU: AHD-TRX17

    Mini 8CH 5.8G 400mW Wireless FPV Transmitter and Receiver Kit

    ini 8CH 5.8G 400mW Wireless FPV Transmitter and Receiver Kit Learn More
    $75.00
  25. SKU: AHD-TRX16

    5.8G 8CH Video Audio Mini Wireless Receiver for FPV

    .8G 8CH Video Audio Mini Wireless Receiver for FPV Learn More
    $89.00
  26. SKU: AHD-TRX15

    9CH Wireless AV Transmitter and Receiver Mini 5.8G 400mW FPV 400-800m

    CH Wireless AV Transmitter and Receiver Mini 5.8G 400mW FPV 400-800m Learn More
    $84.50
  27. SKU: AHD-WIFITR01

    Wireless wifi Realtime Video Transmitter for HOT iPhone Android,AV to WiFi Transmitter,Analog to WiFi

    ireless wifi Realtime Video Transmitter for HOT iPhone Android,AV to WiFi Transmitter,Analog to WiFi,best for Car Backup Camera Learn More
    $45.00

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Transmitter and Receiver

There are many natural sources of radio waves. But in the later part of the 19th century, scientists figured out how to electronically generate radio waves using electric currents. Two components are required for radio communication: a transmitter and a receiver.

Radio transmitters
A radio transmitter consists of several elements that work together to generate radio waves that contain useful information such as audio, video, or digital data.

Power supply: Provides the necessary electrical power to operate the transmitter.

Oscillator: Creates alternating current at the frequency on which the transmitter will transmit. The oscillator usually generates a sine wave, which is referred to as a carrier wave.

Modulator: Adds useful information to the carrier wave. There are two main ways to add this information. The first, called amplitude modulation or AM, makes slight increases or decreases to the intensity of the carrier wave. The second, called frequency modulation or FM, makes slight increases or decreases the frequency of the carrier wave.

Amplifier: Amplifies the modulated carrier wave to increase its power. The more powerful the amplifier, the more powerful the broadcast.

Antenna: Converts the amplified signal to radio waves.

Radio receivers
A radio receiver is the opposite of a radio transmitter. It uses an antenna to capture radio waves, processes those waves to extract only those waves that are vibrating at the desired frequency, extracts the audio signals that were added to those waves, amplifies the audio signals, and finally plays them on a speaker.

Antenna: Captures the radio waves. Typically, the antenna is simply a length of wire. When this wire is exposed to radio waves, the waves induce a very small alternating current in the antenna.

RF amplifier: A sensitive amplifier that amplifies the very weak radio frequency (RF) signal from the antenna so that the signal can be processed by the tuner.

Tuner: A circuit that can extract signals of a particular frequency from a mix of signals of different frequencies. On its own, the antenna captures radio waves of all frequencies and sends them to the RF amplifier, which dutifully amplifies them all.

Unless you want to listen to every radio channel at the same time, you need a circuit that can pick out just the signals for the channel you want to hear. That’s the role of the tuner.

The tuner usually employs the combination of an inductor (for example, a coil) and a capacitor to form a circuit that resonates at a particular frequency. This frequency, called the resonant frequency, is determined by the values chosen for the coil and the capacitor. This type of circuit tends to block any AC signals at a frequency above or below the resonant frequency.

You can adjust the resonant frequency by varying the amount of inductance in the coil or the capacitance of the capacitor. In simple radio receiver circuits, the tuning is adjusted by varying the number of turns of wire in the coil. More sophisticated tuners use a variable capacitor (also called a tuning capacitor) to vary the frequency.

Detector: Responsible for separating the audio information from the carrier wave. For AM signals, this can be done with a diode that just rectifies the alternating current signal. What’s left after the diode has its way with the alternating current signal is a direct current signal that can be fed to an audio amplifier circuit. For FM signals, the detector circuit is a little more complicated.

Audio amplifier: This component's job is to amplify the weak signal that comes from the detector so that it can be heard. This can be done using a simple transistor amplifier circuit.

Of course, there are many variations on this basic radio receiver design. Many receivers include additional filtering and tuning circuits to better lock on to the intended frequency — or to produce better-quality audio output — and exclude other signals. Still, these basic elements are found in most receiver circuits.

Difference between a Transmitter and Receiver

The main difference between a transmitter and a receiver is that a transmitter gathers and decodes information and the receiver displays the information in an audible and/or visual form that consumers can view or listen to. The most well-known and oldest of inventions to use this system is the radio. Towers send radio waves through the air. These waves are picked up by transmitters and then converted into music by the radio receiver.

In many devices which implement radio electronics technology, the transmitter and receiver work together to emit both sound and visuals to consumers. The transmitter generally is composed of an oscillator, a modulator, and separate amplifiers for both radio and audio frequencies. This allows the device to transmit both audible and visual waves. In most areas, the use of transmitters is regulated because improper use could result in dangerous crossing of signals. For example, a crossed signal could interfere with emergency communications.

A receiver generally receives information from a transmitter through an antenna. At that time, it usually separates the signal being given by the transmitter from all other signals coming through the antenna. The sound is then amplified and decoded into a sound that users can understand.

Traditional transmitter and receiver technologies used analog signals to allow consumers to hear music on the radio and both listen to sounds and watch visuals on the television. Today, digital technology is replacing more outdated devices with better and clearer sounds and images. In order for digital signals to be received, however, consumers must own a digital transmitter and receiver or a device which has them.

There are some devices that have a transmitter and receiver all in one unit. In these cases, the combined unit is called a transceiver. These are generally used in devices such as phones where the user receives and sends audio signals at the same time.

When choosing electronics, it is important to pick items that have receivers designed for the signals one hopes to listen to or watch. For instance, a digital receiver will often not read an analog signal and vice versa. Specialize converter boxes can be purchased to convert a receiver into the correct kind for the signal being used. This is especially important now that many television stations are required by law to feature all digital programming, because many consumers own televisions with outdated analog receivers.