GB483576A - Improvements in or relating to radio and other modulated carrier wave transmitters - Google Patents

Improvements in or relating to radio and other modulated carrier wave transmitters

Info

Publication number
GB483576A
GB483576A GB2866036A GB2866036A GB483576A GB 483576 A GB483576 A GB 483576A GB 2866036 A GB2866036 A GB 2866036A GB 2866036 A GB2866036 A GB 2866036A GB 483576 A GB483576 A GB 483576A
Authority
GB
United Kingdom
Prior art keywords
carrier
potential
transmitter
relay
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2866036A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE424179D priority Critical patent/BE424179A/xx
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB2866036A priority patent/GB483576A/en
Priority to FR827733D priority patent/FR827733A/en
Publication of GB483576A publication Critical patent/GB483576A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
    • H02H1/0046—Commutating the detecting means in dependance of the fault, e.g. for reducing their number

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

483,576. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and WASSELL, H. J. H. Oct. 21, 1936, No. 28660. [Class 40 (v)] In a suppressed or quiescent carrier system, a direct-current potential derived from the modulating signal is employed to put the transmitter into the " carrier-on " condition and operates a relay which connects a source of potential in such a manner that the transmitter is maintained in the " carrier-on " condition while signals are applied. Speech or other modulating signals supplied at IN are rectified at Re and cause a direct current to now through resistance R1 and the relay coil X; the rate of rise and decay being controlled by condenser Cl. The transmitter proper, which is modulated by circuits, not shown, is keyed on and off as regards carrier in any known manner, by the valve V1 whose grid is made negative by the voltage across Cl while the armature RI is on the " rest " contact a, and by the source of negative potential E1 through contact b, when the voltage on C1 has risen sufficiently to operate the relay. In a preferred modification, Fig. 2, (not shown) the relay coil X is in the anode circuit of a valve whose grid is made negative by the potential across R1.
GB2866036A 1936-10-21 1936-10-21 Improvements in or relating to radio and other modulated carrier wave transmitters Expired GB483576A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE424179D BE424179A (en) 1936-10-21
GB2866036A GB483576A (en) 1936-10-21 1936-10-21 Improvements in or relating to radio and other modulated carrier wave transmitters
FR827733D FR827733A (en) 1936-10-21 1937-10-11 Improvements to modulated carrier wave transmitters for radiocommunications and similar applications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2866036A GB483576A (en) 1936-10-21 1936-10-21 Improvements in or relating to radio and other modulated carrier wave transmitters

Publications (1)

Publication Number Publication Date
GB483576A true GB483576A (en) 1938-04-21

Family

ID=10279111

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2866036A Expired GB483576A (en) 1936-10-21 1936-10-21 Improvements in or relating to radio and other modulated carrier wave transmitters

Country Status (3)

Country Link
BE (1) BE424179A (en)
FR (1) FR827733A (en)
GB (1) GB483576A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1289138B (en) * 1966-08-03 1969-02-13 Siemens Ag Method and circuit arrangement for residual carrier compensation
DE1297699B (en) * 1966-04-26 1969-06-19 Siemens Ag Process for generating carrier-frequency pulses and arrangement for carrying out the process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1297699B (en) * 1966-04-26 1969-06-19 Siemens Ag Process for generating carrier-frequency pulses and arrangement for carrying out the process
DE1289138B (en) * 1966-08-03 1969-02-13 Siemens Ag Method and circuit arrangement for residual carrier compensation

Also Published As

Publication number Publication date
FR827733A (en) 1938-05-03
BE424179A (en)

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