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The intermediate frequency in the superheterodyne receiver is chosen as the desired compromise between sensitivity and selectivity. 455kHz is used in AM broadcast applications, while 10.7mHz is used for FM. The IF stage is tuned for a steep skirt passband at that frequency, allowing only the desired heterodyned (shifted) input signal to make it through to the demodulator.
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In an FM receiver you use amplitude limiter but in am receiver you do not use frequency limiterexplain?
Because in radio communication a signal is specified by its frequency, In AM the carrier frequency is fixed.. we cant limit or manipulate it as it will might switch us to another carrier in the atmosphere... manipulating however amplitude (as in FM) doesn't switch us to another channel... so remember in radio communication signal is specified by its frequency whether FM or AM..
What is the use of CVT in substations?
A CVT in substations uses it as a communication system. It is also use in filtering high frequency waves that acts as a carrier network.
Why do you use modulation in gsm?
in the case of communication through gsm technology we transmit our voice frequency to somewhere from the origin. normally human voice frequency lays between 300-3400khz. if all the people tends to transmit their voice, the signal wil be distroyed due to interference. also theoretically it need a very long antenna to transmit a low frequency. therefore it is necessary to modulate each and every signal to a high frequency carrier to transmit without any interference and make possible communication mohamed zawahir +94772260383
How t convert high frequency into low frequency?
To covert a high frequency to a low one, we use flip-flops.
Why do you use high frequency signals for communication and why not very high frequencies?
Low, medium and high frequencies is ideal for long distance communication but it is very sensitive to QRM and QRN because only amplitude modulation can be used on this part of the RF spectrum, FM modulation is not possible, where in the higher frequencies, FM (Frequency Modulation) is a beter option but with the drawback of distance overland. VHF, UHF and UUHF can't overcome obstacles like hills, mountains and large buildings, only line of site communication can be used here, although it can be used for long distance in open space IE. in outer space, like satellite communication.
What is the typical centre frequency of intermediate frequency amplifier?
I've seen 455kHz, 10.7MHz and 70MHz intermediate frequencies. There is, however, no law that dictates the IF you run...some very sensitive receivers even use multiple IF stages.
Why intermediate frequency are constant?
The frequency spectrum has been distributed for various purposes. Otherwise, the people may use the frequencies of their choice & there will be wide range of interference. So, in order to ensure proper reception of signals, the standards have been fixed for the transmission of frequencies & also for the intermediate frequency because if the intermediate frequency is varied the overall frequency value will also vary. The intermediate frequency value should be so designed that it should not lie within the range of mixer stage. Otherwise, there is the production of noise signal due to the interference of mixer frequency & intermediate frequency. Also, the intermediate frequency should not be too high. Otherwise, it will reduce the selectivity of the receiver because of increase in bandwidth. Considering all these factors 455 khz is the most suitable intermediate frequency value for an AM receiver.
What is Difference of microwave and general communication?
They use different wavelength and frequency
What is frequency planning?
Frequency planning is the process of assigning specific frequencies to different communication channels within a communication system to avoid interference and ensure efficient use of the available spectrum. It involves organizing and allocating frequency bands to different users or services to optimize the performance and reliability of the communication network.
What does an amateur radio operator mean when he says Q S Y?
It means to change to a different frequency. For example, some will use a repeater to make initial communication and then QSY to a different frequency for direct communication.
In an FM receiver you use amplitude limiter but in am receiver you do not use frequency limiterexplain?
Because in radio communication a signal is specified by its frequency, In AM the carrier frequency is fixed.. we cant limit or manipulate it as it will might switch us to another carrier in the atmosphere... manipulating however amplitude (as in FM) doesn't switch us to another channel... so remember in radio communication signal is specified by its frequency whether FM or AM..
What is the use of CVT in substations?
A CVT in substations uses it as a communication system. It is also use in filtering high frequency waves that acts as a carrier network.
Why does NFC use the unlicensed radio frequency 13.56MHz?
For an explanation of NFC (near field communication), see the related link.
What two frequencies can 802.11n use?
802.11n Wi-Fi can use both 2.4 GHz and 5 GHz frequency bands for wireless communication. Each frequency band has its own advantages and limitations in terms of coverage and speed.
What is the use of oscillators?
Trasmitting stations have their own transmitting frequency. No one can construct an amplifier which amplifies signals over a wide range. So every transmitting frequency has to be changed to one particular frequency. This is known as INTERMEDIATE frequency (IF) This is quite possible by getting beats. So a signal is to generated whose frequency is just more than the incoming frequency by IF This signal is named as local singnal which is generated by the LOCAL oscillator.
What is the frequency range used in wireless communication?
2.4GHz is used & OFDM
What is the use of local oscillator?
A local oscillator generates a radio frequency signal that mixes with the incoming signal in a superheterodyne receiver to produce an intermediate frequency (IF) signal. This IF signal makes it easier to process and extract information from the incoming signal. The local oscillator helps in tuning and filtering the desired signal from the incoming radio frequency spectrum.
