What is FM receiver? How to make an FM reciver? This article describes the receiver with only one manifold and a supply voltage of +5 V compact tuner and will give This article may give you some ideas.
#Content
1. What is FM receiver?
2. What does a radio receiver do?
3. How does a FM receiver work?
4. How to make a FM receiver?
1.What is FM receiver
A radio or FM receiver is an electronic device that receives radio waves and converts the information carried by them to a usable form. An antenna is used to catch the desired frequency waves. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.
Of the radio waves, FM is the most popular one. Frequency modulation is widely used for FM radio broadcasting. It is also used in telemetry, radar, seismic prospecting, and monitoring newborns for seizures via EEG, two-way radio systems, music synthesis, magnetic tape-recording systems and some video-transmission systems. An advantage of frequency modulation is that it has a larger signal-to-noise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation (AM) signal.
People often don’t know the difference between AM receiver and FM receiver. Let’s watch a video together.
2.What does a radio receiver do?
1) FM receiver applications
Although FM receivers are made for radio applications, such as radio broadcasting, it’s still applicable and used in a variety of other electronic systems. Here are some of its applications:
2) Smartphones
Do you know most smartphones on the market have inbuilt FM receivers? Yes indeed! But sad to say for iPhone users, it does not exist as its hardware does not support it. For others like Andriod, you can simply download the NextRadio app that allows for the FN chip usage!
3) Satellite Communication
Data transmission/communication between satellites include FM receiver and transmitter that help with long-distance telephone calls, space station broadcasts, spacecraft direct broadcasting that sends signals of satellite radio receivers for consumers, etc.
4) Modems
FM receivers are found in radio modems, creating private radio networks (PRN) through transferring wireless data across a range of up to tens of kilometers. Such modems are key in industrial usages, where real-time data communication is needed.
So long as applications that require high reliability of data transfer and very high uptime, radio communications are picked.
3.How does an FM receiver work?
1) The transmission is captured by the receiver antenna and fed into an RF frequency selector.
2) The transmission goes into a mixer where it’s combined with a carrier generated by a local V.C.O.
3) The result is then fed into an IF (Intermediate Frequency) signal amplifier. It reduces the frequency through a filtering process that’s required to strip out the carrier more easily.
4) The signal is demodulated.
5) The result is fed into an audio section which amplifies the results so that it can be fed into a speaker and heard by the user.
An FM transceiver simply combines an FM transmitter and an FM receiver in a single unit. The receiver section of the transceiver is the same as what is seen in the FM receiver section and similarly for the FM transmitter.
4.How to make an FM receiver?
With low power consumption and Portability, this is truly a pocket of the receiver. As shown in the drawing works, high-frequency signal received by the antenna for amplifying and mixing, the sound IF signal is generated after the end of the mixer output IF1 from 31.5MHz into the IC (12) feet. After IC amplified with the second local oscillator mixer 42.2MHz, 10.7MHz second IF signal generated by the three-terminal filter 10.7MHz filter into the IC (17) feet, and then put the IC, after demodulation, enter Ic (24) feet, and finally after Ic internal amplifier drives the speaker work. LNB power requirements of the machine also uses a boost circuit by the transistor 2SC8050 and composed of high-frequency transformer to provide work and tuning voltage. As a result of the low voltage power supply tuner. Its supply voltage can get low, the supply voltage can be proved to work around 3.6V, available three AAA NiMH rechargeable battery or a 3.6V lithium battery.
Component Selection: Choose LNB is critical to the machine, you should use high sensitivity, low voltage power supply, small whole additional tuner TDQ36-5V, leads to the terminal name and TDQ36-5V voltage as shown in Table 1. Note that the tuner has two signal outputs, IF2 not. Only IF1. IC selection of Japanese production company Sony AM FM radio ASIC CXA1O19, where only the FM section, which uses a 28 -pin dual in-line package, the pin functions are shown in Table 2. CXA1019 fully functional, including the full circuit AM FM radio, with fewer external components, low power consumption, high sensitivity, low distortion and so on. Tuner w selection 100kΩ potentiometer multi-turn precision potentiometer, tuner with VT and indirectly have a miniature digital voltmeter to display the machine receiving frequency, so as to achieve the miniaturization of the machine. High-frequency transformer B1, B2 oscillating coil selection in the week TRF1445, B1 without modification, B2 removed circle. The remaining elements can be miniaturized as much as possible.
The machine debugging is very simple, just adjust the B1, B2 can be the difference between 10.7MHz IF signal. The rod antenna receiver just adds on to an ordinary radio receiver to a nearby FM radio and television all audio signals.
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