Electric direct current telegraphy transmitter

Details Electric direct current telegraphy transmitter Electric direct current telegraphy transmitter

1978-04-13

1979-08-28

Robinson, Thomas A.

Telegraphy

Systems

Chemical

178 3, H04L 1500

Patent

active

041661966

ABSTRACT:
An electronic transmitter for direct current telegraphy by means of polar line currents has a switching circuit that selectively connects one of the two poles of a telegraphy battery through a unipolar constant current source to a telegraph line, and an output filter having a capacitor in parallel with the telegraph line. The higher frequencies in the telegraphy signals are sufficiently suppressed to keep the noise level in adjacent telephone lines below a prescribed value because the output filter also has two complementary branches in parallel with the telegraph line, at least one of the two branches supplying, in response to a polarity transition of the line current supplied by the current source, a correction pulse having a polarity opposite to the line current to the telegraph line. This output filter is assembled from small-sized, low-priced elements so that an efficient miniaturization of the electronic transmitter in its entirety can be realized.

REFERENCES:
patent: 3671671 (1972-06-01), Watanabe
patent: 3835252 (1974-09-01), Ananiades et al.
patent: 3851098 (1974-11-01), Pingault
patent: 3970944 (1976-07-01), Huellwegen
patent: 4092489 (1978-05-01), Birlmeier

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