Fm Definition and 114 Threads

I know that an AM Amplitude vs. Frequency Spectrum has a central frequency = carrier frequency and two side bands of carrier frequency ± signal frequency. Now what would a similar spectrum look like for an FM wave ? My textbook just says that '... further side frequencies that are...

So I have been taught about FM having noise supressing characteristics, but in that particular course the lecturer told us not to worry about it as it is out of the course syllabus. So I tried to look up on the details on the internet but all I keep seeing is that FM supresses noise but I...

hello i have been given six weeks to design a low-power FM radio transmitter for my project however there are no lectures for this course so i have to do the research on my own. so far from researching on the web. i have found that a simple radio transmitter may consist of a number of stages...

I'm making one of those simple FM transmitters. It uses a variable capacitor to tune. According to the writer of the tutorial, it is difficult to tune the circuit and RF is generally finicky. How would I use a microcontroller to tune the circuit? Thank you, -GiTS

hello i am new, i thinking to make a fm radio receiver but i don't know what i need (capacitor, oscillator etc) can someone help me with more knowledge than me ? if you have link or something else that maybe help me is welcome. i search the internet but i don't can find anything that suit in my...

Guys, from circuitstoday.com I researched, I understood ig picture of a basic FM transmitter. there should have basic blocks like audio amp, modulator (oscillator included), radio amp and the anttena. suppose I want to build a FM transmitter, what is my first step? step1 says I choose 0.5m...

Just curious about the differences between AM and FM radio waves. Any info is appreciated, thanks.

Hi, Could somebody tell me what's the difference b/w FM ( frequency modulation) and AM (amplitude modulation) broadcasts? Also please mention the advantages and disadvantages of both ... I'll be thankful :)

I have been studying multiple AM and FM transmitter schematics trying to distinguish the differences in the circuit that create either am AM (amplitude modulated) or and FM (frequency modulated) RF signal. I have hit a road block as I am unable to see any significant differences between the two...

Homework Statement . I am just trying to understand this cicuit a little better. Especially the right half, I know that the left half is just acting as an amplifier but I'm not sure how the right half works. Also how is the frequency being modulated here? The attempt at a solution. I...

Homework Statement The oxygen nucleus 16O has a radius of 2.91 fm. With what speed must a proton be fired toward an oxygen nucleus to have a turning point 1.11 fm from the surface? Homework Equations Kinetic energy = 1/2 mv^2 Potential energy = 1/4(pi)Enot * q/radius min The...

Some places say (including this paper) claim the bohr radius of muonic hydrogen is 285http://ethesis.unifr.ch/theses/downloads.php?file=LudhovaL.pdf Many more peer reviewed papers say it is 256 fm, or 255 fm though. (search for '256 fm muonic' in teh googlez). So who is right? And more...

Hello, So I was studying for my exam and came across this exercice we did in class and which I really don't know how we got the answer. It says that if we have a FM with a carrier frequency of 4MHz, and the bandwidth is 400KHz, what is then the maximum deviation.. The answer is 200KHz...

As title, my lecturer had given me a project which to design a Analog RF Walkie talkie which in Frequency Modulation and carrier can be between 50Mhz - 200Mhz. I had actually designed the transmitter part but quite confuse in receiver part. Can any master can actually give me some general idea...

Homework Statement Pulsed lasers used for science and medicine produce very brief bursts of electromagnetic energy. If the laser light wavelength is 532 nm, and the pulse lasts for 37 ps, (a) how many wavelengths are found within the laser pulse? (b) How brief would the pulse need to be to...

if we consider fluid flow, then bernoulis equation says that pressure must reduce when velocity is high.What is the direction of pressure when fluid is in flow? When fluid is stationary then pressure varies in vertical direction. It acts in downward direction on account of gravity. Means it is...

it has been a while. i need to know which wavelength is bigger FM radio or Am radio?

Hey everyone, I'm taking on a fairly difficult first project. It's based around a schematic called the 'Radio Shack Special,' which is a simple, super-regenerative radio receiver that is configured to pick up FM signals (It is supposed to be capable of both AM and FM). The FM receiver's...

Well here are a couple of things I would like to know. Thanks in advance! how to build a Frequency-Modulated Radar gun. or how to build a Frequency-Modulated transmitter and reciever or where i can get either of these :D Thanks again!

Hello folks. I want to buy a powerfull Fm Transmitter kit. Where can i find one at reasonable price? Cheers..

Homework Statement I bought an FM radio mono kit. After I assembled it, it works. But I want to know how to have a clear reception or signal and to acquire more stations. What should I do? Any tips or techniques? does the coil affects the signal? Homework Equations The Attempt at a...

I don't understand why a PLL alone can't be used as an FM receiver. I've got a project showing how PLLs are used and I'd like to use an FM transmitter (which I have a schematic for) transmitting wirelessly a signal that is demodulated by the PLL a few feet away. Seems pretty simple, where I set...

Hi.I have got this circuit for a low cost short range FM transmitter but I am unable to understand the working and functionality of the circuit.Please help me in understanding the working.What I know is that its working as a VCO(voltage controlled oscillator) when input (through electret mic) is...

Homework Statement I wanted to show that a particular wave is composed of the 4 frequencies W = W0 +/- W1 +/- W2 The equation for this FM wave is y(t) = Acos(W0t+W1COS(W2t)t ) I tried showing the different frequency components by performing a Fourier transform on the equation y(t)...

For the Frequency modulation the carrier frequency will change with respect to data. but i need to transmit the modulated carrier at 93.5MHz means what i need to do.

Homework Statement s(t)=13*cos(2000*pi*t + 100*sin(8*pi*t)) Determine the fundamental period of this signal, i.e., the shortest period. Homework Equations x(t)=A*cos(2*pi*f(c)*t + a*sin(2*pi*f(m) + phi)) A=13; f(c)=1000; a=100; f(m)=4; phi=0 Inverse Euler's - A*cos(omega*t + phi) =...

I am trying to amplify extremely small signal(around 200 nanovolt) from a coil of wire on a ferrite to make a gaussmeter, I've seen some FM transmitter schematics online that I want to connect this signal to, Would a FM transmitter be able to work with a signal this low? I tried amplifying...

Please I want to know how fm transmiters are designed. I need help

I want to know how to design fm transmitters. That is how to select appropriate values of the components. I need help

Hey all I have to do a massive physics report on the topic "a comparison of Am against FM broadcasting." What are some topics i could research and compare. Cheers HSV

My Sony 400-CD carousel died last week, and I have been waiting all that time for a replacement to arrive. My collection (about 75% of it fits in that player) is a mix of blues, rock, country, country/rock (think Poco, Buffalo Springfield, etc), bluegrass, R&B, etc. I unloaded all my CDs from...

Homework Statement Radio 4 transmits on FM at a frequency of 92.5 MHz Calculate the wavelength and use it to explain why listeners in deep valleys cannot pick up radio 4 FM. Homework Equations The Attempt at a Solution

Homework Statement A 1kHz analogue signal is to be encoded using 8-level Pulse Code Modulator. This specification results in a bit rate of 5.5K bits/sec. The signal is to be transmitted over a 1 km distance with a 10kHz bandwidth on a Frequency Modulated, F.M., Carrier. The carrier frequency...

I want to design a fm receiver circuit for the frequency range of 144-146Mhz.Kindly suggest me a suitable ic for the same.

What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwav What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwave" waves, and AM waves do? I have to do a physics project on causes of cancer, based on a physics standpoint. I have an...

A quick one for you sparkies... There are a ton of FM transmitters you can use to pipe your iPod or other device over your FM stereo. There is one thing in common to the three units I have tried that is very annoying. I have noticed that there is very poor sound quality for the higher...

Hello everyone, I'm relatively new to dabbling with electronic circuits, so I decided to build my own FM transmitter using a circuit I found on the internet. The schematic has been attached as an image file. However, there are a few things I'd like to clarify. What exactly does the 'ground'...

1. An aluminum airplane is flying west, parallel to the ground, at 350 m/s. The Earth's magnetic field produces a downward component of 8.30 x10-5 T at that point. For the purposes of this question, treat the wing as if it was a conducting rod. a) What is the magnitude of the potential...

Hey guys, For school I have to study the zero-crossing demodulation method of reconstructing an FM signal. So far what I've been reading has been confusing me a bit and I have a few questions to ask: 1) How does a LP-filter act as a "time averager" for a train of impulses? 2) Does the...

Hi I usualy lissen to radios on internet, and i would like to be able to hear it everywhere in my house, rather than just when i am on my pc. Does this exist : a Frequency Modulator that i can plug by USB to my pc, and broadcast localy (like a 250 meters range) my internet radio or any...

Hi, I'm thinking about transmitting digital signals with FM. The effect I'm trying to achieve is FSK. Can I just feed the digital signal to the input of the FM transmitter? With FSK the carrier is frequency modulated with 2 frequencies, but since the digital signal has infinite bandwidth...

I have a simple question - but I somehow doubt there is a simple answer. 1) I would like to start a small, non-commercial, home transmitted FM Radio Station - mostly for fun and as a hobby. I have seen an 18W transmitter for a reasonable price. I live on relatively flat land in the country...

Hi, I am attempting to figure out how an FM transmitter I'm building works. I was wondering if anyone had some suggestions on a resource for transistor circuits or just has some ideas of how to go about figuring it out. If anyone is interested, here is the schematic...

The objective is to "design and construct an FM radio receiver" that is able to tune to commercial FM radio broadcast channels spanning from "87.5 MHz to 108 MHz", and to produce audible demodulated output. can anybody help me with a simple circuit for this assignment with proper values for...

Homework Statement Designing an FM Radio Receiver. You enjoy listening to KONG-FM, which broadcasts at 96.6 MHz. You detest listening to KRUD-FM which broadcasts at 96.5 MHz. You live the same distance from both stations and both transmitters are equally powerful, so both radio signals produce...

[SOLVED] Find an FM Radio station's wavelength, frequency given Homework Statement An FM radio station broadcasts at a frequency of 101.3 MHz. What is the wavelength?Homework Equations Vsound = 343m/s @ 20 deg C λ = v/fThe Attempt at a Solution I used the formula λ = v/f and got something...

Correct me if I'm wrong. I've always taken it on faith that the switch to frequency modulation from amplitude modulation resulted in the much better quality signal and listening experience we have today. Modulation of the frequency is likely less susceptible to distortion than is modulation...

I'm looking for a "physical" explanation (or as close to one as I can get) for the displayed spectrum of an FM signal on a spectrum analyzer. I'm using a sinusoidal carrier of 200 MHz, a sinusoidal modulating tone, and a deviation of 5 KHz for my question. Lets say I use a very slow rate...

So I'm trying to get my fm circuit to work. I've taken the design from the website below. http://cappels.org/dproj/FMdist/fmdis.htmhttp://img217.imageshack.us/img217/6839/fmdis3un4.jpg My current issue is that the circuit works, but only when hooked to a DC transformer. I get a signal of ~...

I have a few questions regarding the spectrum of FM... 1. What is the equation that predicts where the sidebands will occur in an FM signal given a certain FM rate and deviation? 2. If I have an FM signal with a rate of 16 KHz and a deviation of 5 KHz and I look at the signal on a spectrum...