Electronic Signal Products
Electronic Signal Products
Manuals
ESC-2015 92 kHz FSL SCA Generator. The design is similar to the tone generator portion of the 
HAL ST-6000 radioteletype FSK modem. In both cases, the frequency shift keying is accomplished by selecting between two crystal oscillators. The selected oscillator frequency is then divided as necessary, then drives a counter/decoder with a resistor network on the outputs. The counter/resistor combination forms a digital to analog converter with a sine shaped output. The resistor network output then drives additional filters to remove other frequency components.
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