GB585263A - Improvements in or relating to radio frequency carrier current communication systems - Google Patents

Improvements in or relating to radio frequency carrier current communication systems

Info

Publication number
GB585263A
GB585263A GB3364/45A GB336445A GB585263A GB 585263 A GB585263 A GB 585263A GB 3364/45 A GB3364/45 A GB 3364/45A GB 336445 A GB336445 A GB 336445A GB 585263 A GB585263 A GB 585263A
Authority
GB
United Kingdom
Prior art keywords
channel
frequency
amplifier
phase
amplifiers
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
GB3364/45A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB585263A publication Critical patent/GB585263A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J9/00—Multiplex systems in which each channel is represented by a different type of modulation of the carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J99/00—Subject matter not provided for in other groups of this subclass

Landscapes

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

Abstract

585,263. Multiplex wireless signalling. STANDARD TELEPHONES & CABLES, Ltd. Feb. 9, 1945, No. 3364. Convention date, Feb. 12, 1944. [Class 40 (v)] A frequency-modulated currier is keyed to produce pulses of constant recurrence frequency, phase duration and amplitude. The communication channel thus formed may comprise one of a number of such channels intercalated to produce a multiplex system. At the transmitter of the multiplex system described, each channel has a F.M. oscillator 400, 420, 440, Fig. 4, feeding an amplifier 406, 426, 446 and coupler 409, 429, 449, the combined signals feeding a common amplifier 410 and aerial 411. A keying control means 415 is connected to keying means 408, 428, 448, which produce the channel pulses, those in the second and third channel being appropriately delayed for intercalation by phase-shifters 425, 445. A special synchronizing signal may be introduced in the first channel from source 412. At the receiver, Fig. 5, an R.F. amplifier 502 feeds a frequency changer 503 and individual I.F. channel amplifiers 504, 524, 534. These are followed by gating stages 505, 525, 535, frequency discriminator demodulators 505A, 525A, 535A, A.F. amplifiers 506, 526, 536, low-pass filters 507, 527, 537 and reproducers 508, 528, 538. The I.F. amplifiers are blocked during the intervals between the pulses of their particular channel by circuits 509, 529, 539 controlled through phase shifters 512, 522, 532 from the output of a detector 510, fed direct from the frequency changer 503, and a filter 511 which selects the basic pulse recurrence frequency component from the composite received wave which is gapped at this frequency. The appropriately timed unblocking pulse is derived in the circuits 509, 529, 539 by clipping and shaping this basic frequency phase-displaced wave. When a special synchronizing modulation is used it is derived from the output of the discriminator 505A. The blocking voltage may be applied to R.F. amplifier or frequency changer if they are separate for each channel. The signals may be transmitted over a highfrequency line or wave guide instead of a radio link.
GB3364/45A 1944-02-12 1945-02-09 Improvements in or relating to radio frequency carrier current communication systems Expired GB585263A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US585263XA 1944-02-12 1944-02-12

Publications (1)

Publication Number Publication Date
GB585263A true GB585263A (en) 1947-02-03

Family

ID=22017357

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3364/45A Expired GB585263A (en) 1944-02-12 1945-02-09 Improvements in or relating to radio frequency carrier current communication systems

Country Status (1)

Country Link
GB (1) GB585263A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2135029A1 (en) * 1971-04-06 1972-12-15 Thomson Csf

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2135029A1 (en) * 1971-04-06 1972-12-15 Thomson Csf

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