FA-238 27.0000MB-A

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Crystals are an important component of the world of electronics as they are used in timing, frequency control and reception. FA-238 27.0000MB-A crystal is an important example of a crystal particularly used in receiving communication. This article will look at its application field and working principle.

The FA-238 27.0000MB-A crystal is used primarily in short-wave radios, radar, and communication equipment. It is a quartz crystal, the choice of material being due to the fact that it will vibrate at the same frequency when a low voltages is applied, a feature that is extremely useful in radio equipment. It is used in receivers as a local oscillator to provide the frequency conversions necessary for tuning.

The operating principle of the crystal is based on the fact that it vibrates in a very controlled and predictable way when a suitable voltage is applied. This vibration results in a precise output frequency being produced which can be used to local oscillations. The vibrations create a sinusoidal output wave, and these are used for converting between frequencies within the receiver.

The crystal is generally connected to the receiver’s oscillator circuit and will act like an electronically variable capacitor. When a voltage is applied to the crystal a capacitor will be formed, the value of this capacitor being dependant upon the voltage applied. This change in capacitance will then cause the resonant frequency of the crystal to change, which in turn is fed back to the oscillator circuit to change the frequency of the oscillator.

The operating frequency of the crystal is dependent upon a number of factors. These include the cut and shape of the crystal, the loading capacitance across it, and the applied voltage. The oscillations will stop when the voltage is removed, as the relaxation oscillator circuit will no longer be able to overcome the electrical losses in the circuit.

In order to ensure the crystal oscillates correctly, it is important that it is correctly tuned. Tuning involves adjusting the loading capacitance until the crystal oscillates at the desired frequency. This process is carried out using both an oscilloscope and a wave meter. The oscilloscope is used to check the waveform of the output as the input is varied, while the wavemeter is used to measure the oscillator frequency.

In summary, the FA-238 27.0000MB-A crystal is an important example of a crystal used in communication equipment. It works by vibrating at a constant and predictable frequency when a low voltage is applied. This results in a sinusoidal output wave, and these are used to convert between frequencies in the receiver. It is tuned by adjusting a loading capacitor, and ensuring that the output wave shape is correct.

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