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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.
Looks like a tuning fork for doctors?
The low-pitched tuning fork (C128) is used to test sensation of vibration. Higher pitched tuning forks are used in neurological examinations.
How do you find the xm radio id on a Honda?
the xm id can be found by tuning to xm channel 000 and the radio id can be found by turing the key to the "on" position and, with the radio off, hold down the 1 and 6 preset buttons, then push the power button. the radio id will be displayed for about 10 seconds. note that these are two separtate id numbers used for different purposes. the xm id is to activate your xm subscription and the radio id can be used to retrieve your radio code from the Honda dealer you bought the car from.
What is a tuning fork and how is it used?
tuning fork steel instrument in the shape of a U with a short handle. When struck it produces an almost pure tone, retaining its pitch over a long period of time; thus it is a valuable aid in tuning musical instruments.
What form of energy is used in tuning fork?
Rape
What is tuning capacitor?
A capacitor whose capacitance is variable (within some range). They are usually used to adjust resonant circuits or delay circuits.
What is gang tuning?
ganged tuning is used in the FM radios in order to change from one FM radio station to another ,particularly a variable capacitor is used so as to vary the value of capacitance in order to acuire different freq ranges available
What is a tuning capacitor?
A capacitor whose capacitance is variable (within some range). They are usually used to adjust resonant circuits or delay circuits.
What is the function of varactor diode?
Voltage controlled variable capacitor. Usually used for dynamic tuning of resonant circuits.
Uses of gang capacitor?
Gang capacitors are commonly used in radio tuners/receivers. Radio tuners/receivers have formation of LC(inductance and capacitor). Here this circuit has one fixed inductance and capacitor parallel with gang capacitor. Normally gang capacitor used in superhetrodyne receiver.
What type of diode is used as a variable capacitor?
varactor diode is a correct answer
What is a verible capacitor?
A variable capacitor is an electronic component that allows the capacitance to be adjusted or varied. It typically consists of two conductive plates separated by a dielectric material, with one plate being movable. By changing the distance between the plates or the effective area of overlap, the capacitance can be increased or decreased. Variable capacitors are commonly used in tuning circuits, such as radios, to adjust frequency response.
Applications of horn antenna?
1. Measure the box you're trying to wind. 2. Use wire and a variable tuning capacitor. 3. Wind as many turns as you need to to achieve the frequency range you want. 4. Connect the 2 lead to the variable tuning capacitor 5. Couple it to your radio. 6. Use about 1/2 turns for to connect a 300 ohm connection to your radios input. More turns = Lower to mid range frequencies Less turns = Mid to high frequencies.
What is a padder capacitor?
Padders are a type of Capacitors which are used at low frequency end of the radio dial.
How does the Switching diode used in television tuning?
A: Those diodes are used as a variable capacitance whereby applying a voltage changes the capacitance which effect the frequency of the tuning circuit
Can you replace a 2-30 trimmer capacitor with a fixed value capacitor?
Yes you can. But the variable one is used so that you can very the frequency and it cant be varied anymore if you use a fixed capacitor.
What does a preset capacitor do in a circuit?
A preset capacitor, often referred to as a trimmer capacitor, is used in circuits to fine-tune capacitance values for specific applications. It allows for adjustments in capacitance, which can help in optimizing the performance of oscillators, filters, and tuning circuits. By providing a variable capacitance, it enables engineers to calibrate the circuit for desired frequency response or impedance matching. Once set, it can be left in place to maintain the desired circuit characteristics.
