Patent
Keying circuit for modulating transmitted carrier frequency - has pulse shapers for output and other stages, each with timer
TLDR
In this paper, an electronic keying circuit which delivers pulses at short intervals for keying the modulated transmitted carrier frequency, has a sender with at least one active stage before its output stage.Abstract:
An electronic keying circuit which delivers pulses at short intervals for keying the modulated transmitted carrier frequency, has a sender with at least one active stage before its output stage. A pulse shaper is allocated to the output stage and each preceding stage, and a common timer is provided for all pulse shapers. The timer delivers approximately rectangular individual keying pulses having the same period, to each pulse shaper. Pulses for the individual pulse shapers differ in width and phase, so that the output stage is switched on after preceding stages, and switched off before them. The pulse shapers round off the edges of the pulses from the timer.read more
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