Bandwidth Definition and 134 Threads

HiHo! W. Stallings's "Wireless Communications & Networks, 2nd edition" explains the relationships between bandwidth and Fourier transformation by depicting a square wave. The square wave is approximated with a Fourier series having several sine terms. The bandwidth is then defined by the...

hi, pls can someone help me with converting FWHM bandwidth of a laser from metres to hertz

The question is: To tell you the truth I don't know where to start, I have read over all the teacher's notes and the chapters in the book, and I haven't seen a question similar to this at all. I am not even sure I quite get the question. Can someone help get me started please? Thanks!

Hi, this is a problem I am trying to do: So I found that at 3dB, V0=0.7079Vi and I wasn't sure if I should use real numbers or complex numbers, I did both, I'll show the real one: Vo/Vi=0.7079=R/(R+1/wc)=Rwc/(Rwc+1)...I can solve for w, but this will only give one answer, when I use complex...

Could sb explain to me how to calculate the 3db frequency of the inverting op amp, please? 1. For non-inverting op amp If Bandwidth gain product is 1.5x10^6 Hz and gain is 20dB then the F3db is given by Bandwidth gain product over 20. It equals 150kHz. 2. For inverting op amp the F3db is...

I keep running into reports that within a year or so, the current system will be unable to sustain the rate of growth of bandwidth demand. Projections range from "the internet will become little more than a toy" (a paraphrase), to predictions of brownouts or other limitations. It seems that...

If anyone know pls tell me in Gain bandwidth product, gain in what manner (dB or voltage gain (Vo/Vi)) ?

If anyone know pls tell me in Gain bandwidth product, gain in what manner (dB or voltage gain (Vo/Vi)) ?

Does anyone know what the typical bandwidth of the RTTY, PSK31 and FSK amateur radio transmission schemes are ?

Howdy all. I have a somewhat tenuous relation with our IT department. Basically because they think they are the only ones who know what happens inside a computer. It's an annoyance usually, but every once in a while, something comes up that makes me think they are complete buffoons/idiots...

hi, I've got simple circuit with noninverting op amp. There are two resistors by which gain is set. And as far as I know the product of bandwidth and gain constant. That is, if we increase the gain the bandwidth decreses and if we decrease the gain , bandwidth increses. The problem is that I am...

I am using Excel and plotting a line of best fit for Resistance vs. Bandwidth. I used the LINEST function to get my values, and it shows that it would cross the y-intercept at around 288 Hz. I am just wondering why when using resistance vs bandwidth it would never cross at the origin. That is...

Has an upper frequency limit for the photon ever been determined ?

Since this is a Computer Science forum now i thought i'd post this impractical yet interesting take on data transfer. If machine A has to send n bits over to machine B, and A knows the clock speed of B, rather than sending the n bits, A can instead always send two bits bit-1 and bit-2. B...

Help!

Ok I seem to have a serious problem. My understanding of Bandwidth was that it is the Range of Frequencies that a Radio Receiver can let through its RLC Circuit (or known as the Bandpass Filter). I thought that The set of frequencies are such that they are larger than half the total power...

According to tight binding moment, for BCC crystalographic structures (such as Fe), energy E depends on wave vector kx, ky, kz: E(x) = const - 8t cos(kx * a/2)*cos(ky * a/2)*cos(kz * a/2), where t>0 is the model parameter. What is the bandwidth W in terms of parameter t? Can you find kx, kz, and...

Homework Statement If an LED is used in an optical communications system, explain what would happen to the temporal spread caused by material dispersion in the fibre as the LED is cooledHomework Equations (having trouble using the latex equation editor, sorry) I know that the temporal...

I've got a signal and I would like to find the 3 dB bandwidth. The signal has a center frequency of f_{c} and a has a bandwidth shaping filter applied to it (ie, a root raised cosine filter). The problem with finding the bandwidth, is that I have no equation for representing a PSK signal...

What is there about a particular protocol that defines its range of use? Is there such definition? i.e. 802.11 is used for short range high bandwidth, GSM/EGPRS for long range cellular communications and bluetooth for even shorter range communication on PANs. Is it possible for 802.11 to be...

If one computer on a LAN network is using maximum bandwidth on, say, downloading a file, then will this affect the bandwidth of other computers on the network? And is bandwidth usually artificially constrained or naturally constrained?

Why is the group delay of a filter inversely proportional to the filter bandwidth? For example in a color TV transmitter the luma signal must be delayed with respect to the chrominance signal before they are added together because the luma signal has a larger bandwidth.

hi, 1.please tel me in detail why do we say that for higher capacity we require more bandwidth? higher capacity means more data rate, meaning more bits per seconds(and i know BW is bps) but tell me in terms of frequencies availble in a band..coz we transmit our signal on 1 freq then what it...

Hi, I would like to know why do the digital signals require more bandwidth than the original analogue signals to convey the same information ? Is it something to do with the Nyquist Theorem or Shannon's Law ? And what about the harmonics ? Thank you.

Happened to come across this qn: Noise from receiver is measured by rms voltmeter with bandwidth 100khz, and voltmeter reads 2mV. what will be the reading for multimeter set to read dc voltage and bandwidth of 10khz? My ans is 10/100 x 2 = 0.2mV. cos smaller bandwidth reduced by a factor...

A satellite telemetry link operating in S-band uses frequency modulation to transmit the value of an analog voltage on the satellite to a receiving Earth station. The voltage has a range from -1.0 volts to +1.0 volts, and a maximum frequency of 1000Hz.The FM modulator on the satellite has a...

hey all. i read that the definition of the bandwidth of a system is the frequency range up until the signal's power (at DC) drops by -3dB. This obviously only applies to a first order system , right? Surely for a second order - it is defined as the range of frequency up until the power...

I continue to have troubles with my residential DSL service. Occasionally (on the order of every half hour or more), my service will just stop working for a minute or so. (Gee, that doesn't sound like a big deal, but really, it makes me want to toss my computer out the window). I'd like to...

Well, the lab script said a light wave with 60 MHz is too fast to be detected by oscilloscope so i did some search on the internet on the normal bandwidth(if i am rite, or it is called sampling rate?) is usuall more than 100 MHz. Doesnt this mean that measuring 60 MHz should have no problem at...

Doppler Radar?? Please can someone help me with doppler radar...need to know bandwidth?? Is it usually continuous wave or pulse?? or can it be both?? pretty much just after some general knowledge on doppler radar? thanks in advance!

Hi, Still trying to figure out things with signals and systems... It doesn't go as well as I hoped so please help me... I was checking out a computer program which allows you to specify the parameters of any kind of signal going through any kind of system and then provides you with the...

Well after submitting a very long articulated email to my isp's support page, i got this in response: We limit FTP to 128kbps. Any file transfering program we limit the bandwidth because many of them are bandwidth intensive programs. The rate on it 128kbps. I claimed i needed...

Is there a graph or chart somewhere that would show how much bandwidth can be handled at certain frequencies?

i am new to this forum..a programmer who deals with server and related stuff i like to know how much bandwidth this forum takes a day and how many hits a day?