GB491359A - Transmission modifying networks for electric signalling systems - Google Patents

Transmission modifying networks for electric signalling systems

Info

Publication number
GB491359A
GB491359A GB35039/37A GB3503937A GB491359A GB 491359 A GB491359 A GB 491359A GB 35039/37 A GB35039/37 A GB 35039/37A GB 3503937 A GB3503937 A GB 3503937A GB 491359 A GB491359 A GB 491359A
Authority
GB
United Kingdom
Prior art keywords
impedances
nodes
loops
voltmeter
signalling systems
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
GB35039/37A
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 GB491359A publication Critical patent/GB491359A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
    • H03B5/1817—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
    • H03B5/1835—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a vacuum tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies

Landscapes

  • Measurement Of Resistance Or Impedance (AREA)

Abstract

491,359. Inductance and capacitance measurements. STANDARD TELEPHONES & CABLES, Ltd. Dec. 17, 1937, Nos. 35039 and 35040. Convention dates, Jan. 2, 1937 and May 4, 1937. [Class 37] [Also in Groups XL, XXXV, and XXXIX] A high frequency network comprises a closed loop conductor having two terminals connected by parallel paths of unequal length. When two loops 1619, 1621, Fig. 16, are used, their lengths can be adjusted to produce voltage anti-nodes at 1625, 1627 ; by a transposition as in Fig. 17, or by the introduction of a 2 length as in Fig. 21, the voltage anti-nodes may be changed to voltage nodes, so that a voltmeter at 1635 is unaffected. This may be used for measuring impedances the unknown and known variable impedances 1637, 1639, being connected symmetrically across the loops impedance 1639 being varied until the voltmeter gives a null reading, the two impedances then being equal. The impedances may be connected through transformers, Fig. 18 (not shown).
GB35039/37A 1937-01-02 1937-12-17 Transmission modifying networks for electric signalling systems Expired GB491359A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US491359XA 1937-01-02 1937-01-02

Publications (1)

Publication Number Publication Date
GB491359A true GB491359A (en) 1938-08-31

Family

ID=21958227

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35039/37A Expired GB491359A (en) 1937-01-02 1937-12-17 Transmission modifying networks for electric signalling systems

Country Status (1)

Country Link
GB (1) GB491359A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445895A (en) * 1942-12-31 1948-07-27 Bell Telephone Labor Inc Coupling arrangement for use in wave transmission systems
DE1108823B (en) * 1951-12-01 1961-06-15 Int Standard Electric Corp Bandpass filter with high slope

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445895A (en) * 1942-12-31 1948-07-27 Bell Telephone Labor Inc Coupling arrangement for use in wave transmission systems
DE1108823B (en) * 1951-12-01 1961-06-15 Int Standard Electric Corp Bandpass filter with high slope

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