advantage of frequency shift keying?
110147
.   Frequency shift keying has a better signal to noise ratio than on off keying. One frequency indicates that the signal is "on" and the other frequency indicates that the signal is "off". Since both frequencys are close together a noise pulse will affect both frequencys and therefore cancel itself out. \n.   Frequency shift keying is used to send teletype and can also be used to send radio control signals.
116565
With the goal that a clock signal will not drift, \nPLL (phase locked loop) logic can be added to keep\nthe frequency constant.  It works by adding "feedback"\n(from the output back to the input) with a tuning\ncircuit to keep the two signals (the original input\nas well as the feedback) in synch.
740015
What benefits (if any) are there to the CONSUMER if front end power factor correction is used. Is there a benefit in decentralised powerfactor correction across a large consumer's site. There is a need for many elec eng to really understand the implications of powerfactor correction as there are a large number of éxperts' marketing some ideas that are questionable. This topic easily leads into harmonics also an isssue that needs to be covered in depth. With high frequency technology such as VSD etc harmonics seem to be able to be set up by bad connection practices; i.e. lug/crimp terminals with a hole too large for stud etc.
87895
The 2.4 Ghz is the frequency the wireless devices talk on, not their speed.\n\nNo internet connection (that is relatively inexpensive) is going to move 2.4 Gb per second (where talking multiple T3/4 lines)..
128881
I'm not sure what you mean by reinforce. A transmitting state can increase the amplitude of the ways - make it louder.\n\nChanging the frequency or wavelength (and when you change one your change the other, they're interconnected) will just "change channels."\n\nOr are you thinking of some sort of filter that will minimize all waves coming into a building except for one set. Sort of blocking out other channels.
522363
you can use a fm modulator
524846
B'coz wavelength decides the power gain that transmitting antenna should have .\n& distance that can be covered by signal also depends on wavelength.
586356
The local loop of the Public Switched Telephone Network was initially designed to carry POTS voice communication and signaling, since the concept of data communications as we know it today did not exist. For reasons of economy, the phone system nominally passes audio between 300 and 3,400 Hz, which is regarded as the range required for human speech to be clearly intelligible. This is known as commercial bandwidth. Dial-up services using modems are constrained by the Shannon capacity of the POTS channel.\n\nAt the local telephone exchange (UK terminology) or central office (US terminology) the speech is generally digitized into a 64 kbit/s data stream in the form of an 8 bit signal using a sampling rate of 8,000 Hz, therefore – according to the Nyquist theorem – any signal above 4,000 Hz is not passed by the phone network (and has to be blocked by a filter to prevent aliasing effects).\n\nThe local loop connecting the telephone exchange to most subscribers is capable of carrying frequencies well beyond the 3.4 kHz upper limit of POTS. Depending on the length and quality of the loop, the upper limit can be tens of megahertz. DSL takes advantage of this unused bandwidth of the local loop by creating 4312.5 Hz wide channels starting between 10 and 100 kHz, depending on how the system is configured. Allocation of channels continues at higher and higher frequencies (up to 1.1 MHz for ADSL) until new channels are deemed unusable. Each channel is evaluated for usability in much the same way an analog modem would on a POTS connection. More usable channels equates to more available bandwidth, which is why distance and line quality are a factor. The pool of usable channels is then split into two groups for upstream and downstream traffic based on a preconfigured ratio. Once the channel groups have been established, the individual channels are bonded into a pair of virtual circuits, one in each direction. Like analog modems, DSL transceivers constantly monitor the quality of each channel and will add or remove them from service depending on whether or not they are usable.
80708
The advantage is it's free.\n\nThe disadvantage is that is very unsophisticated and gives you very little control as what to allow in or out.\n\nZone Alarm is a much better choice.
936965
Analog and Digital systems just imply the type of modulation.\n\nFundamentally it doesn't matter what the carrier frequency is, so sharing bandwidth is okay .... the FCC may disagreed though.
394868
Advantage is handy, everywhere oso can connect and is fast speed somore... \nDiadvantages is line sometime not stable enough, might disconnect due to weather conditions and environment issues.
183850
Building on the first answer, which is technically correct.  Strength has little to do with it, it is the modulation scheme's resistance to interference, or ability to perform with a lower signal to noise ratio.\n\nFM's big selling point was that it was immune to natural radio noise (and essentially is), because noise affects the amplitude of a received signal, not its frequency.\n\nXM uses a digital modulation scheme, which further improves fidelity as well as better performance when confronted with noise. With a digital signal, the signal to noise ratio can be much lower than with analog technologies.  In fact even some errors in the bits being transmitted can be tolerated and even corrected through mathematic algorithms.  This makes digital a desireable mode because of the improved performance, and you can reduce the transmission power or in essence make the signal weaker (saving battery power on the satellite) and still get excellent performance.
957609
GSM uses TDMA (time domain multiplex). I believe it can handle 8 conversations per frequency channel.
547553
I don't know if anywone uses the old BNC stuff anymore. Used to be widely used.  100baseT is used for higher speed transmissions than 10base technology.  So if faster=better, then no, 10base2 is not better than 100baseT.\n\nEdit: I see they are still selling the old stuff. Perhaps the lower speed and better shielding might be better suited to some environments.
131118
Frequency hopping consists in changing the frequency\nused for transmission at regular intervals. It has been introduced in GSM mainly in order to deal with two specific problems which affect the tranqmission quality:\nRayleigh fading: The radio signals are subject to fading,\nwhich is approximately Rayleigh distributed. For a slow\nmobile, a fading dip may cause a severe information\nloss. Frequency hopping will spread sequential information\nin the frequency domain. Since the Rayleigh fading\nis frequency selective, frequency hopping will cause frequent changes of the fading, thus reducing the risk of\nlosing sequential information. Introducing this frequency\ndivers& will, together with the interleaving and coding,\nimprove the transmission link quality, for slow mobiles\nin particular.\nIntegerence: Without frequency hopping, strong signals\nfrom neighbor cells transmitting on or close to a carrier\nfrequency will affect the carrier signal continuously,\nwhich may negatively affect the transmission performance.\nFrequency hopping will cause different signals to\ninterfere with the carrier at different times, a property\ncalled interference diversi9. On system level, the result\nis a “smearing” of the interference between users, an\neffect often called inteference averaging. Furthermore,\ninterference diversity gives a second effect, which is\nemphasized in this paper. Since sequential bursts of\ninformation are received under different interference\nconditions, the risk of a sequential information loss is\nreduced. This, together with the interleaving and coding,\nwill improve the transmission link quality.
495154
a wireless communication standard.
905952
Commercial radio stations transmit signals using two types of schemes.....AM (Amplitude Modulation) and FM (Frequency Modulation).\n\nIn both types of schemes, the voice/music/audio is imposed upon what is known as the carrier wave. This carrier wave is generated at the radio station and has frequency within a certain portion of the range. For example FM radio stations typically have a range of 88 MegaHertz (Million Cycles Per Second) to 108 MegaHertz.\n\nSo, when your station changed from 93.9MegaHertz to 98.3MegaHertz, what they changed is the frequency of the carrier wave.\n\nThe music/voice/audio then is used to modulate (change) this frequency by a pre-determined amount.  Other radio stations are assigned carrier wave frequencies in such a way that two adjacent stations will not broadcast on top of each other.\n\nFor example, since your station now broadcasts on 98.3 MegaHertz frequency, the adjacent stations will be assigned frequencies of 98.5MegaHertz (above your station's frequency) and 98.1 MegaHertz (below your station's frequency).\n\nHope this helps.