GB344034A - Improvements in or relating to wireless receiving systems - Google Patents

Improvements in or relating to wireless receiving systems

Info

Publication number
GB344034A
GB344034A GB3653629A GB3653629A GB344034A GB 344034 A GB344034 A GB 344034A GB 3653629 A GB3653629 A GB 3653629A GB 3653629 A GB3653629 A GB 3653629A GB 344034 A GB344034 A GB 344034A
Authority
GB
United Kingdom
Prior art keywords
fed
parallel
output
piezo
valves
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
GB3653629A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3653629A priority Critical patent/GB344034A/en
Publication of GB344034A publication Critical patent/GB344034A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezo-electric or electrostrictive material
    • H03H9/545—Filters comprising resonators of piezo-electric or electrostrictive material including active elements

Abstract

344,034. Valve amplifying circuits ; filter circuits. ROBINSON, J., 76, Mill Way, Mill Hill, London. Nov. 28, 1929, No. 36536. [Class 40 (v).] A selective system comprises two mechanical resonaters fed in parallel and having slightly different resonant frequencies the outputs being combined in opposite sense so that only the signalling frequency which is intermediate the two other frequencies appears in the output since this is oppositely phase displaced by the resonators. Fig. 1 shows a pair of valves 15, 17 having parallel outputs and fed by opposite phases from circuit 10 through piezo-electric crystals 14, 16. In a modification (Fig. 2, not shown) the valves have a push pull output and are fed in parallel through separate crystals. The piezo-electric crystals may form mechanical coupling devices as shown in Fig. 3 or may be replaced by tuning forks. To prevent interference the input of the forks may be electrostatic and the output electromagnetic and screening may be employed. Specifications 325,232, [Class 40 (v), Wireless signalling &c.], and 344,869 are referred to.
GB3653629A 1929-11-28 1929-11-28 Improvements in or relating to wireless receiving systems Expired GB344034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3653629A GB344034A (en) 1929-11-28 1929-11-28 Improvements in or relating to wireless receiving systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3653629A GB344034A (en) 1929-11-28 1929-11-28 Improvements in or relating to wireless receiving systems

Publications (1)

Publication Number Publication Date
GB344034A true GB344034A (en) 1931-03-02

Family

ID=10389048

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3653629A Expired GB344034A (en) 1929-11-28 1929-11-28 Improvements in or relating to wireless receiving systems

Country Status (1)

Country Link
GB (1) GB344034A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745757C (en) * 1935-10-02 1944-05-22 Hans Bodo Willers Electromechanical impedance element with an oscillating element which extends essentially in one direction and which is tensioned and which is electrically excited from a circuit
DE755422C (en) * 1950-10-24 1953-02-16 Western Electric Co Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745757C (en) * 1935-10-02 1944-05-22 Hans Bodo Willers Electromechanical impedance element with an oscillating element which extends essentially in one direction and which is tensioned and which is electrically excited from a circuit
DE755422C (en) * 1950-10-24 1953-02-16 Western Electric Co Electric broadband wave filter in the form of a cross-link network with mechanically vibrating elements

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