FM Radio Circuits

  

 

Frequency modulation is used in telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency.
This is in contrast with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant.
 
Frequency modulation can be regarded as phase modulation where the carrier phase modulation is the time integral of the FM modulating signal. FM is widely used for broadcasting of music and speech, and in two-way radio systems, in magnetic tape recording systems, and certain video transmission systems.
 
FM signals can be generated using either direct or indirect frequency modulation. Direct FM modulation can be achieved by directly feeding the message into the input of a VCO.
 
For indirect FM modulation, the message signal is integrated to generate a phase modulated signal. This is used to modulate a crystal controlled oscillator, and the result is passed through a frequency multiplier to give an FM signal. Is also used at intermediate frequencies by all analog VCR systems, including VHS, to record both the luminance (black and white) portions of the video signal. Commonly, the chrome component is recorded as a conventional AM signal, using the higher-frequency FM signal as bias. 
 
FM is the only feasible method of recording the luminance ("black and white") component of video to and retrieving video from Magnetic tape without extreme distortion, as video signals have a very large range of frequency components — from a few hertz to several megahertz, too wide for equalizers to work with due to electronic noise below -60 dB.
 
 

 

 

News

Get On 10 GHz For 3 Euros

Get On 10 GHz For 3 Euros Hackaday And it is a project following this path that is our subject today, for [Peter Knol, PA1SDB] has repurposed a modern Doppler radar module as a transmitter for the 10GHz or 3cm amateur...

Dec 23, 2016

Sony Expands In-Car Audio Line Up Emphasizing Smartphone Connectivity and EXTRA BASS™ Sound

PR Newswire (press release) Sony Expands In-Car Audio Line Up Emphasizing Smartphone Connectivity and EXTRA BASS™ Sound PR Newswire (press release) LAS VEGAS, Jan. 4, 2017 /PRNewswire/ -- (CES, Booth #3102) -- Sony...

Jan 5, 2017

Arcam unveils AV860 Dolby Atmos DTS:X processor

InsideCI Arcam unveils AV860 Dolby Atmos DTS:X processor InsideCI Following on from last year's AV390, AVR550 and AVR850 AV receivers , the processor features Dirac Live room correction, and decoding for Dolby...

Jan 12, 2017

CES 2017 Exhibitor Profiles: Sangean America, Inc. to TubeMogul

CES 2017 Exhibitor Profiles: Sangean America, Inc. to TubeMogul Business Wire (press release) For over 40 years Sangean has been one of the world's leading manufacturers of consumer Radios including HD Radio , AM/ FM ,...

Dec 30, 2016

Kits Solve a Multitude of Problems

Kits Solve a Multitude of Problems Radio World The LeaningTech DSP and PLL Digital Stereo FM Radio Receiver Module with serial control costs just $14.32 on Amazon and features an LCD display with very low power...

Nov 22, 2016

T-Mobile Galaxy S7 and S7 Edge gained FM radio in the latest update

Android Authority (blog) T-Mobile Galaxy S7 and S7 Edge gained FM radio in the latest update Android Authority (blog) One such system improvement that T-Mobile users discovered is the activation of the radio...

May 5, 2016

RadioNet Looks Back at Internet Radio

RadioNet Looks Back at Internet Radio Radio World ... conventional AM/ FM receivers . (RadioNet's first such unit was a US$99 purple plastic receiver module that, although its audio was tinny and thin-sounding,...

Jun 13, 2016

5 Things I Love About The LG G5

Android Police 5 Things I Love About The LG G5 Android Police Another legacy feature that Samsung and HTC have basically abandoned on newer devices? Yep: FM radio is a legitimately useful add-on, and one that...

Apr 29, 2016

Radio Frequency Front End Module Market

Radio Frequency Front End Module Market - Global Industry Analysis, Size, Share, Growth, Trends And Forecast 2016 ... RF Globalnet (press release) In a superheterodyne radio receiver , the circuit between antenna and...

Nov 15, 2016

Repurposing an FM Radio Chip for an RC Submarine Receiver Project

EE Times Repurposing an FM Radio Chip for an RC Submarine Receiver Project EE Times So why am I working on a VHF receiver for RC submarines? The answer, strangely enough, is WiFi. As WiFi became more prevalent,...

Jul 29, 2014

Units & Modules