A crystal oscillator for frequencies below 3 MHz
This crystal oscillator lends itself well to lower frequencies, e.g. for 2 or 3 MHz. With a corresponding crystal, the arrangement should also be used as a 1MHz calibration oscillator. The pull range is less than 1 kHz, so that a very exact adjustment to the setpoint frequency is possible.
The circuit also oszillates with ceramic filter elements for e.g. 455 kHz. Here is a fairly large draw range of up to 20 kHz can be achieved, making the circuit, for example, also good as a BFO can be used.