GB479034A - Arrangements for keying radio transmitters - Google Patents

Arrangements for keying radio transmitters

Info

Publication number
GB479034A
GB479034A GB20873/36A GB2087336A GB479034A GB 479034 A GB479034 A GB 479034A GB 20873/36 A GB20873/36 A GB 20873/36A GB 2087336 A GB2087336 A GB 2087336A GB 479034 A GB479034 A GB 479034A
Authority
GB
United Kingdom
Prior art keywords
rectifier
resistance
shunting
grids
current
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
GB20873/36A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to GB20873/36A priority Critical patent/GB479034A/en
Priority to US138803A priority patent/US2152764A/en
Publication of GB479034A publication Critical patent/GB479034A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)
  • Transceivers (AREA)

Abstract

479,034. Wireless transmitting systems. STANDARD TELEPHONES & CABLES, Ltd. (Western Electric Co., Inc.) July 28, 1936, No. 20873. [Class 40(v)] In an arrangement for switching on and off the carrier in a high power radio transmitter, reversal of grid current due to secondary emission, causing unstable operation, is prevented by shunting the grid circuit resistance with a rectifier. The telegraph signals from source 2 operate relays 10 and 11 which connect the grids of amplifiers 5, 6 normally blocked by bias sources 14, 18, to suitable operating potentials over resistances 13, 17 and associated condensers 22, 23. Secondary emission from the grids of amplifier 6 may cause reversal of grid current in this stage, and resulting positive bias is prevented by shunting the resistance 17 with a rectifier 24 suitably of the mercury vapour type, which effectively short circuits the resistance 17 for reverse current. The rectifier also carries the main current when the relay contact breaks, and so prevents excessive sparking.
GB20873/36A 1936-07-28 1936-07-28 Arrangements for keying radio transmitters Expired GB479034A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB20873/36A GB479034A (en) 1936-07-28 1936-07-28 Arrangements for keying radio transmitters
US138803A US2152764A (en) 1936-07-28 1937-04-24 Controlling or keying arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20873/36A GB479034A (en) 1936-07-28 1936-07-28 Arrangements for keying radio transmitters

Publications (1)

Publication Number Publication Date
GB479034A true GB479034A (en) 1938-01-28

Family

ID=10153176

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20873/36A Expired GB479034A (en) 1936-07-28 1936-07-28 Arrangements for keying radio transmitters

Country Status (2)

Country Link
US (1) US2152764A (en)
GB (1) GB479034A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822421A (en) * 1952-10-16 1958-02-04 Int Standard Electric Corp Modulator for voice frequency telegraph systems

Also Published As

Publication number Publication date
US2152764A (en) 1939-04-04

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