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If you are mixing local oscillator freq with adc frequency in FM radio then what is the freq of mixer chosen?
Wiki User
∙ 14y ago
The most common IF in consumer FM radios is 10.7 MHz.
So, for the FM broadcast band of 88 - 108 MHz, the local oscillator frequency would be
between 98.7 MHz and 118.7 MHz.
It could just as well have been chosen to work on the low side of the RF. But that would have
placed the LO between 77.3 MHz and 97.3 MHz. Any LO leakage from the radio could have
played havoc with TVs in the house tuned to the old analog Channel 5 (76 - 82 MHz) or
Channel 6 (82 - 88 MHz).
Wiki User
∙ 14y ago
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What should be the oscillator frequency for tuning in 710 KHz on AM radio with a 455 KHz IF?
The local oscillator could be either 1165 KHz (710+455) or 255 KHz (710-455).
What is a super heterodyne receiver?
A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.
If a radio station is tuned at 1600 kHz what is the image frequency?
Assuming that the receiver uses a high-side local oscillator and an IF of 455 KHz, the image frequency is 910 KHz above. When tuned to 1600 KHz, the image frequency would be 2,510 KHz.
How the reception of a particular radio set station is selected on your radio set?
A particular radio station is selected on our radio set by adjusting the natural frequency of LC-circuitequal to the frequency of particular transmitting station.
When you turn up the volume on a radio what changes?
You are changing the capacitance of the main component that determines the frequency of the "local oscillator" in the radio. The local oscillator mixes with all of the radio signals that come in from the antenna, and converts them all down to lower frequencies. The one signal that winds up converted to 10.7 MHz in an FM radio (or 455 KHz in an AM radio) is the one that gets passed on and processed by the rest of the guts of the radio. All the others get filtered out and discarded.
What is a local oscillation?
A local oscillator is used in a superheterodyne radio circuit for example.The incoming radio frequency is mixed with an internal local oscillator circuit to generate a new intermediate frequency (IF) .The local oscillator usually runs at a frequency of 470kHz and is generated by an inductor and capacitor(LC oscillator)
What is local oscilator?
A local oscillator is used in a superheterodyne radio circuit for example.The incoming radio frequency is mixed with an internal local oscillator circuit to generate a new intermediate frequency (IF) .The local oscillator usually runs at a frequency of 470kHz and is generated by an inductor and capacitor(LC oscillator)
What is the difference between crystal and local oscillator?
oscillator frequency is different.crystal working piezo electric effect
What is the difference between local oscillator and oscillator?
Oscillator is a generic word for any circuit that produces an alternative signal. The shape of the signal, its stability and its output impedance are not considered in this case. "Local oscillator" is one specific type of oscillator used in radio receiver for the purpose of frequency conversion. the input Radio Frequency( RF ) signal is "mixed" with the local oscillator signal and the subtraction of two frequencies is obtained at the output. "Mixing" in this context means: "multiplication"\ In some other context in electronics (specially audio) mixing means "adding" the mathematical operation for local oscillator is F out=Fin - F loc.osc. The output of the mixing operation can also be Fin+F loc.Osc. But this higher frequency is usually filtered out. The local oscillator needs to be a pure sine wave with a very good frequency stability and usually very stable output voltage. Recently very good "synthesizers" are introduced in the market that permit generation "programmable local oscillation"
Why you convert FM signal to IF frequency?
Mix it with a local oscillator whose frequency is (the IF frequency) away from the frequency of the FM signal you're interested in.
What is the purpose of a local oscillator in mixer?
A local oscillator is a device that generates a sinusoidal signal with a frequency such that the receiver is able to generate the correct resulting frequency, or intermediate frequency (IF), for further amplification and conversion into audio detection. There is one local oscillator in a single conversion super heterodyne receiver where heterodyning or mixing is used to generate beat frequencies, which may be the sum or the difference of two frequencies. The local oscillator is usually adjustable and in step with the increment or decrement in the receiver frequency. For instance, if the receiver is tuned to 1,455 kilohertz (kHz) as radio frequency input (RF-in), the local oscillator frequency (LOF) may be set to 1,910 kHz for a so-called high side injection. The two signals are fed to an electronic device known as the mixer, which derives LOF - RF-in = IF or 455 kHz, which suggests why amplitude modulation (AM) broadcast receivers have about four stages of low-power amplifiers tuneable to 455 kHz.
How to calculate image frequency?
f (image) = 2 * f (local oscillator) + fc ................. if f ( l.o ) > fc f (image) = 2* f (local oscillator) - fc
What is function of an oscillator?
A local oscillator is an electronic device used to generate a signal normally for the purpose of converting a signal of interest to a different frequency using a mixer. This process of frequency conversion, also referred to as heterodyning, produces the sum and difference frequencies of the frequency of the local oscillator and frequency of the input signal of interest. These are the beat frequencies. Normally the beat frequency is associated with the lower sideband, the difference between the two.
The FM receiver is tuned 98.3 mhz if 10.7 mhz local oscillator frequency is?
The question probably should be, "If the FM receiver is tuned to 98.3MHz and the IF (intermediate frequency) is 10.7MHz, then what frequency is the local oscillator running at?" The answer would be 87.6MHz but i could be 109MHz and would still work. The local oscillator is mixed with the received signal and what comes out contains both the sum and the difference of the two frequencies. The amplifiers that follow are highly tuned to the IF and so only that frequency is amplified and demodulated by the receiver.
What is the use of local oscillator?
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 basic function of tuning capacitors?
The "tuning capacitor" in a radio is involved in determining the frequency of an oscillator somewhere in the radio. As that capacitance is varied, the frequency of the oscillator changes. If the radio device is a transmitter, then the frequency on which it's transmitting changes. If the device is a radio receiver, then the frequency of the internal "local oscillator" determines the frequency that will be selected, out of everything coming down from the antenna, and then processed, detected, amplified, and filtered, for your listening pleasure.
What should be the oscillator frequency for tuning in 710 KHz on AM radio with a 455 KHz IF?
The local oscillator could be either 1165 KHz (710+455) or 255 KHz (710-455).
