RF Receivers

A radio receiver is an electronic circuit that receives its input from an antenna, uses electronic filters to separate a wanted radio signal from all other signals picked up by this antenna, amplifies it to a level suitable for further processing, and finally converts through demodulation and decoding the signal into a form usable for the consumer, such as sound, pictures, digital data, measurement values and navigational positions. Consumer audio and high fidelity audio receivers and AV receivers used by home stereo listeners and audio and home theatre system enthusiasts.

Communications receivers, used as a component of a radio communication link, characterized by high stability and reliability of performance. Simple crystal radio receivers (also known as a crystal set) which operate using the power received from radio waves. Satellite television receivers, used to receive television programming from communication satellites in geosynchronous orbit.

Specialized-use receivers such as telemetry receivers that allow the remote measurement and reporting of information. Measuring receivers (also: measurement receivers) are calibrated laboratory-grade devices that are used to measure the signal strength of broadcasting stations, the electromagnetic interference radiation emitted by electrical products, as well as to calibrate RF attenuators and signal generators.

Scanners are specialized receivers that can automatically scan two or more discrete frequencies, stopping when they find a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. They are mainly used for monitoring VHF and UHF radio systems.

Internet radio device.

DSP technology, short for digital signal processing, is the use of digital means to process signals and is coming into wide use in modern shortwave receivers. It is the basis of many areas of modern technology including cell phones, CD players, video recorders and computers. A digital signal is essentially a stream or sequence of numbers that relay a message through some sort of medium such as a wire.

Vlf converter

This converter uses a low-pass filter instead of the usual tuned circuit so the only tuning required is with the receiver. The dual-gate MOSFET and FET used in the mixer and oscillator aren"t critical. Any crystal having a frequency compatible with the receiver tuning range may be used. For example, with a 3500 kHz crystal, 3500 kHz on the receiver dial corresponds to zero kHz; 3600 to 100 kHz; 3700 to 200 kHz, etc..

4-18Mhz-converter

The unit consists of rlamplifier Q1, local oscillatorQ2, and mixer Q3. The two bands are covered without a bandswitch by using an i-f or 3.5 MHz. The oscillator range is 7.5 to 14.5 MHz. Incoming signals from 4 to 11 MHz are mixed with the oscillator to produce the 3.5-MHz i-f. Signals from 11 to 18 MHz are mixed with the oscillator to also produce an i-f of 3.5 MHz. At any one oscillator frequency, the two incoming signals are 7 MHz apart. ..

Transistorized Am Radio Circuit

Shown is a schematic of a typical transistor AM radio. This circuit uses npn transistors. The circuit is generic; therefore, no specific values are given for some components...

CW signal processor

This circuit provides interferenced rejection for the CW operator. The 567 phase-locked loop is configured to respond to tones from 500 to 1100 Hz. The Schmitt trigger reduces the weighting effect caused by the output of the PLL remaining low after removal of the audio signal. Ten to 15 millivolts of audio activate the circuit..

Low-cost-line-receiver

This timer makes an excellent line receiver for control applications involving relatively slow electromechanical devices. ..

Agc System For Ca3028 If Amplifier

An MPF102 amplifier feeds IF signals to a 2N4126. A potentiometer in the MPF102 source acts as a gain co..

Simple Low-Frequency Receiver

Using an NE602 heterodyne detector and Ul as an RF amplifier, this receiver tunes the middle portion of the l..

FM carrier current remote speaker system

High quality, noise free, wireless FM transmitter/receiver operates over standard power lines. Complete system is suitable for high-quality transmission of speech or music, and will operate from any ac outlet anywhere on a one-acre home site. Frequency response is 20-20, 000 Hz and THD is under Transmission distance along a power line is at least adequate to include all outlets in and around a suburban home and yard..

Sawtooth Generator For Sweep Generators

This circuit will generate a linear sawtooth between 30 Hz and 3 000 Hz. Ql is a constant-current s..

Simple-ham-band-receiver

This circuit is configured for the 80m band. The 365-pF, broadcast-band variable capacitor should have a vernier drive with a six-to-one ratio, which makes tuning easier by separating the stations on the dial. A good antenna and ground are also recommended. ..

Visual Cw Offset Indicator

An NE567 tone decoder, tuned to the transceiver"s CW offset frequency, ensures that the transceiver will be tran..

Sonic Defender

This oscillator-driver produces a deafening sound of about 3 kHz, modulated with a 10-Hz warble. BZ1 is a Matsushita EFB-RP3..

Shortwave-converter

The NE602, U1, contains oscillator and mixer stages. The mixer combines the oscillator signal with the input rf signal to produce signals whose frequencies are the sum and difference of the input frequencies. For example, a 7.5-MHz signal is picked up by the antenna and mixes with the 8.5-MHz oscillator frequency. The difference between those two signals is 1 MHz-right in the center of your AM dial. ..

Radio Commercial Zapper Circuit

The LR inputs are summed, dated and drive a comparator. The comparator senses level and generates a transition when audio inputs go above or below preset thresholds. The number of these transitions (corresponding to rapid volume changes) are integrated and feed voltage controlled amplifiers. This device actually senses dynamic range. BLOCK DIAGRAM OF THE COMMERCIAL KILLER: The envelope of the signal is used to vary the pulse rate from IC2-C...

Reflex Radio Receiver

The RF signal is passed from the antenna through CI to the tuned circuit made up of LI and C2. One end of L2 feeds th..

Low-frequency-converter

Among the signals below 550 kHz are maritime mobile, distress, radio beacons, aircraft weather, European Longwave-AM broadcast, and point-to-point communications. The low-frequency converter converts the 10 to 500kHz LW range to a 1010 to 1550kHz MW range, by adding 1000kHz to all received signals. Radio calibration is unnecessary because signals are received at the AM-radio"s dial setting, plus 1 MHz; a 100-kHz signal is received at llOO kHz, a 335-kHz signal at 1335.....

Receiver monitor

The alarm plugs into the earphone jack on a receiver. Then when a signal (normally fed to the headphones) is detected and applied to the gate of SCR1, it conducts, sounding whatever alarm is connected to SOI. The signaling device can be an audible alarm or a lamp...

Wideband-signal-splitter

With one HA-2539 or HA-2540 and two low-capacitance switching diodes, signals exceeding 10 MHz can be separated. ..

Trf Radio

This simple AM radio uses a Ferranti ZN414 IC and runs from a 9-V supply. A 5he"-diameter ferrite rod serves as an antenna, and u..

SECRET CODE ENABLED SECURE COMMUNICATION USING RF TECHNOLOGY

The project is designed to send secured message by using a secret code from a computer keyboard connected to the transmitting unit via RF technology. The message is retrieved at the receiver end only upon entering the secret code used by the transmitter. Thus, complete secrecy is maintained in this communication process. For example in military operations, secrecy is of paramount importance. So when there is a need for sending any secret message, one can type the.....

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AM receiver circuit ~ why how diagram

Here is a low cost AM receiver circuit that can be tuned from around 550 to 1100 KHz. Three transistors are used in this project. The transistors Q1 and Q2 are wired as a compound transistor pair i...

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Thanks to everyone for visiting the product Genie 36521R Intellicode Internal Receiver Circuit Board Replaces 20437R 31171R B008UDU086 this is product good quality . This is Check Price & Review pr...

88MHz to 108 MHz simple FM radio receiver circuit - Electronics ...

This extremely simple FM radio receiver circuit is made possible by the special purpose TDA7000 IC. It integrates nearly all the functions necessary to build an FM receiver needing only a few exter...

Fast Diagrams: TDA1072A for AM receiver circuit

This TDA1072A integrated AM receiver circuit performs the active and part of the filtering functions of an AM radio receiver. TDA1072A is intended for use in mains-fed home receivers and car radios...

AM Receiver Circuit Using Transistor | download free wiring diagram

This is the simple design and sensitivity and selectivity of the receiver are good. This circuit is use a compact three transistor, regenerative receiver with fixed feedback. The circuit is based o...

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