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What should be the oscillator frequency for tuning in 710 KHz on AM radio with a 455 KHz IF?
Wiki User
∙ 11y ago
The local oscillator could be either 1165 KHz (710+455) or 255 KHz (710-455).
Wiki User
∙ 11y ago
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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.
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.
A transmission system at a radio station uses a an to convert a direct current into a high frequency alternating current?
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Why the automatic frequency control function is usually not necessary in today's FM receivers?
AFC was used to provide an electronic means to stabilize the frequency of a circuit. Older receivers and transmitters used a tank circuit, made of an inductor and capacitor to select frequency. Since both the inductor and capacitor are physical objects, their sizes and properties vary with temperature, humidity, age and other factors. Also to be able to tune the frequency, at least one of them had to be deliberately made to be mechanically alterable to change it's electrical properties. These factors caused the frequency to slowly drift over time. Also, the tuning was usually accomplished in a continuously variable way, so it was difficult to confirm an exact tuning to the station which could lead to loss of sensitivity or distortion of the signal. AFC used electronic feedback to fine tune the tank circuit by a (usually) electrically tuned component. Modern radio equipment tends to use a quartz crystal oscillator of a fixed frequency as a reference. Quartz crystals can easily be made stable in frequency to 50 parts per million. This is sufficiently accurate to not need to compare it with the frequency of the incoming signal, itself derived from a stable crystal source. The radio is usually tuned by a frequency synthesizer controlled by the crystal. Both AFC and the frequency synthesizer method use an electrically tuned variable frequency oscillator to tune the radio. The difference is that AFC used characteristics of the received signal to measure and correct the mistuning, while frequency synthesizers compare the tuning with crystal reference. AFC cannot find the frequency you desire to tune, it only fine tunes it once you select it. The frequency synthesizer accurately tunes the radio to whatever frequency you ask it.
What variable capacitor used for tuning radio?
In radios that aren't solid state, and use variable capacitors for tuning, the air-dielectric variable capacitor is the almost universal choice for radio frequency applications. More information on air variable capacitors is available at www.orenelliottproducts.com.
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 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)
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.
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.
A transmission system at a radio station uses a an to convert a direct current into a high frequency alternating current?
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The function of an oscillator in a radio transmitter is to?
There are typically at least two oscillators involved in the transmission aspect of a radio transceiver: one is the transmission oscillator which creates a cosine waveform modified with the input key (the information being broadcasted), the other is the variable frequency oscillator which allows one to select the desired frequency for communication. On most transceivers the VFO also modifies the receiving end of the device simultaneously.
What are the uses of oscillators in electronics?
to produce sustained oscillations without any ac input.it is nothing but an amplifier with positive feedback and without input.it just converts the noise in the circuit and amplifies it to produce oscillations.
What are the elements of radio communication system?
There are many elements of a radio communication system. These elements include a transmitter, radio frequency oscillator, modulator, transmitting ariel, receiving ariel, demodulator, and amplifier.
What is use of RFC in Hartley oscillator?
it is a radio frequency choke which connects the dc supply to the circuit but isolate the dc supply from the high frequency oscillations generated in the feedback circuit
When you turn the knob of your radio to tune to a station what do you chang?
You change a variable resistor in the the tuning circuit. The value of the resistor dictates the frequency that the radio is receiving.
What equipment uses a crystal oscillator in its operation?
Your quartz watch, your cell phone, all electronics that uses a computer inside. The quartz crystal forms the time base for the digital pulses. Crystal oscillators are also used in radio receivers and transmitters to provide accuracy in frequency selection. In a transmitter it provides the exitation frequency. In the receiver it provides the local oscillator in a superhetrodyne setup. Multifrequency devices (tunable and channelised radio) take the local oscillator and multiply and divide it, to provide a comparison frequency for a voltage controlled oscillator (VCO). The VCO is then controlled by a Phase Locked Loop (PLL) which holds the required frequency very accurately.
