A transistorized pulse width keyer

With the advent of pulse width (PW) telemetery, and the addition of full scale and zero reference pulses to keep the ground station in constant calibration; greater accuracy and reduced size have been indicated. Silicon transistors allow operation directly from the 28 volt line plus operation at higher ambient temperatures as a result of a lower ambient rise than is customary with vacuum tube circuitry. Appropriate circuit design allows high input impedance and increased linearity.