A radio frequency (RF) signal generator is used in generating high frequency signals at a specific frequency for testing laboratories. The output frequency may range for example from about 100 kHz to around 40 GHz. A typical RG generator consists of: RF oscillator, amplifier, output level meter and a calibrated attenuator.
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This oscillator includes a continuous frequency control and a frequency range switch, to set the output to any desired frequency.
The oscillator circuit that is used in RF generator is normally either a Colpitts or Hartley oscillator.
The amplifier has an output amplitude control. This allows the voltage applied to the attenuator to be set to a calibration point on the output level meter.
The output level must always be reset to the calibration point each time the frequency is changed. This is done at the output level meter.
The calibrated attenuator displays the correct voltage level (set to a calibration point on the output level meter) from the amplifier.
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Many RF generators have features for amplitude modulation (AM) and frequency modulation (FM) of the output. Switches are provided on the front panel to allow the user to select no modulation in addition to internal or external AM or FM modulation.
Every section of the RF generator is shielded by enclosing it in a metal box. The whole system is then completely shielded. This shielding is necessary to prevent:
RF signal generators are commonly used in radar and communication, research and development labs, education and training, electromagnetic interference (EMI) testing and material testing. Their major uses include:
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