Three state loop keyer

Details Three state loop keyer Three state loop keyer

1980-12-16

1983-10-25

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307255, 307270, 307262, H03K 1704, H03K 1728

Patent

active

044121415

ABSTRACT:
A transistorized keying circuit is described which provides for both polar and neutral interfacing. The circuit comprises an oscillator, an AND gate, an exclusive OR gate, a transformer, and two similar output circuits each of which is connected to the secondary of the transformer. The oscillator produces a high frequency binary output signal having an asymmetric duty cycle. The output of the oscillator and a low frequency data signal are applied to the AND gate. The output of the AND gate and another low frequency data signal are applied to the exclusive OR gate whose output is amplified and applied to the primary of the transformer. Each output circuit coupled to the secondary of the transformer comprises a switching transistor for switching a supply voltage onto a transmission line and a peak detector for controlling the operation of the switching transistor. When the AND gate is enabled and the output signal from the exclusive OR gate is the oscillator output signal, only one of these transistors is switched ON; and when the output of the oscillator gate is the inverted signal only the other transistor is switched ON. When the AND gate is disabled, neither transistor is switched on. For polar operation of this circuit, the opposite end of the transmission line is connected through a load resistor to voltage supply common. For neutral operation either the AND gate can be enabled and disabled or the load resistor can be connected to voltage supply positive or negative.

REFERENCES:
patent: 3479531 (1969-11-01), Gauld
patent: 4052558 (1977-10-01), Patterson
patent: 4140927 (1979-02-01), Feucht

Affiliated with

Also associated with

Rating

Three state loop keyer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Three state loop keyer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three state loop keyer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-714202