The Switched Crystal Calibrator is a compact and fully built crystal calibrator or marker generator that provides 1 MHz, 100 KHz, 50 KHz, or 25 KHz marks through switch-selected outputs. It is based on a high-accuracy 1 MHz crystal oscillator with a 5 ppm accuracy rate that provides three output frequencies as square waves. Additionally, the calibrator features a variable output potentiometer that allows the output square wave shape to be trimmed if necessary. The device can be powered by applying 9-20 V DC to the barrel jack or by applying the heater AC voltage to the screw terminal block. This calibrator is an excellent choice for those looking for a budget-friendly and reliable option for their ham radio gear.
Based around a high accuracy (5 ppm) 1 MHz crystal oscillator whose out put is then divided to provide the 3 output frequencies as square waves. Marker Generator. On board rectification and smoothing then feeds the 5 volt regulator.
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