Simple two tone oscillator
Simple two tone oscillator

Simple two tone oscillator

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Soldering Project KIT
The quality of the SSB signal of an Amateur HF radio station is always in the focus of attention of radio Amateurs who use this type of radiation. A "dirty" or distorted signal not only damages the operator's reputation, but also creates significant problems for other radio Amateurs working on the air. Be sure to check the quality of the radiated signal of a newly manufactured, upgraded or repaired transceiver, but it is equally important to periodically monitor the quality of the signal of an industrial or homemade transceiver in operation. Over time, as the components of the transceiver age, its parameters can change, sometimes quite significantly and not for the better.
It is hardly advisable to make complex devices for monitoring the quality of the emitted signal (although for some radio Amateurs this may be of interest), but to make a low-frequency generator that forms a two-tone signal, even beginners can do it. However, to check the output signal of the transmitter, you will also need an oscilloscope (preferably broadband, up to 30 MHz), but if you want this device, you can ask your colleagues for a while. In the absence of an oscilloscope, you can use an SDR receiver (even the simplest one) to evaluate the quality of the SSB track.
  • Power supply: 9V
  • 2 tones: 700 and 1900 Hz
  • R13 potentiometer controls the output level
  • R9 potentiometers allows to get the same tones of 700 and 1900 Hz
  • Output impedance XS1 and XS2 ~ 600 Ohms