GB147701A - Improvements in or relating to the reception of electric oscillations - Google Patents

Improvements in or relating to the reception of electric oscillations

Info

Publication number
GB147701A
GB147701A GB1968920A GB1968920A GB147701A GB 147701 A GB147701 A GB 147701A GB 1968920 A GB1968920 A GB 1968920A GB 1968920 A GB1968920 A GB 1968920A GB 147701 A GB147701 A GB 147701A
Authority
GB
United Kingdom
Prior art keywords
circuit
frequencies
frequency
beats
winding
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
GB1968920A
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.)
Telefunken AG
Original Assignee
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
Publication of GB147701A publication Critical patent/GB147701A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Synchronous Machinery (AREA)

Abstract

147,701. Ges. f³r Drahtlose Telegraphie. May 2, 1916, [Convention date] Wireless telegraphy and signalling; ware detectors.-In a system for the reception of undamped oscillations, the received waves of frequency n are used to excite an alternator or electro-static machine which possesses a natural frequency of N, thereby producing two new frequencies (n + N) and (n - N) which interfere in the detector circuit to form beats. The alternator 1, Fig. 1, consists of a stationary winding 2, excited bv oscillations received by the aerial 3, and a rotating winding 4 included in the aperiodic detector circuit 5, 6, 7. In the arrangement shown in Fig. 2, the secondary circuit including the winding 4 is not aperiodic, but is given two wave components of frequencies (n + N) and (n - N) by placing a condenser 11 in parallel with a small part of the inductance of the circuit. Atmospheric disturbances may be reduced by introducing two intermediate resonant circuits 12, 13, Fig. 3, tuped to frequencies (n + N) and (n - N) respectively, and variably coupling a common detector circuit to them by means of inductances 14, 15. In all the above-mentioned modifications beats of 2N are formed in the detector circuit. One of the circuits 12, 13 may be tuned to frequency n and coupled direct to the aerial, in which case beats of frequency N will be heard in the telephones. The secondary circuit 8 can, as shown in Fig. 4, be so arranged that it reacts again on the primary circuit 2 and produces two further frequencies (n + 2N) and (n - 2N). To this end, the circuit 8 is either wound as a short-circuited armature or it is tuned to frequencies (n + N) and (n - N). By giving the primary circuit 2, three wave components of frequencies n, (n + 2N), and (n - 2N), beats of frequency 2N and 4N are obtained. In all the arrangements described, the rotary circuit 4 may be made aperiodic by short-circuiting the rotary winding by an inductance, and coupling the circuit 8 thereto. The system may also be used for reception from tonic train transmitters. The machine 1 may be formed of a stationary and a rotating capacity, which influence one another periodically, in place of inductive windings.
GB1968920A 1916-05-02 1920-07-08 Improvements in or relating to the reception of electric oscillations Expired GB147701A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE297971T 1916-05-02

Publications (1)

Publication Number Publication Date
GB147701A true GB147701A (en) 1921-12-08

Family

ID=6090846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1968920A Expired GB147701A (en) 1916-05-02 1920-07-08 Improvements in or relating to the reception of electric oscillations

Country Status (2)

Country Link
DE (1) DE297971C (en)
GB (1) GB147701A (en)

Also Published As

Publication number Publication date
DE297971C (en)

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