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MJE340 Connection Diagram

2017-09-09 18:06  
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MJE340 Connection Diagram

 

Developed for receiving RTTY transmitted from satellite as space-only keying. Receiver can be operated in CW or narrow-filter mode, to increase signal-to-noise ratio. Any receiver having CW filter with 400-Hz bandwidth can be used. Tune for audio output of 1 kHz. Audio is converted to varying DC voltage by envelope detector and amplified by 741 opamp that drives additional filter having high-level output for space and low-level output for mark. Slow rise and fall times of varying voltage are converted to ON/OFF keying signals by 741 used as comparator, for feeding to two-stage driver and high-voltage loop keying circuit of conventional design.-K.O. Learner and W. A. Kotras, Oscar RTTY Converter, 73 Magazine. July 1975, p 53-54.