GB514064A - Improvements in or relating to electrical wave filters - Google Patents

Improvements in or relating to electrical wave filters

Info

Publication number
GB514064A
GB514064A GB12341/38A GB1234138A GB514064A GB 514064 A GB514064 A GB 514064A GB 12341/38 A GB12341/38 A GB 12341/38A GB 1234138 A GB1234138 A GB 1234138A GB 514064 A GB514064 A GB 514064A
Authority
GB
United Kingdom
Prior art keywords
inductance
iii
capacity
resistance
network
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
GB12341/38A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB514064A publication Critical patent/GB514064A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only

Abstract

514,064. Impedance networks. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 25, 1938, No. 12341. Convention date, April 24, 1937. [Class 40 (iii)] An intermediate-frequency filter for admitting a wide television band while excluding an adjacent sound-frequency band comprises two coupled circuits I, II, tuned to the mid-band television frequency and a rejector network III for excluding the sound frequencies, means such as the resistance 26 being provided for balancing out the effects of the resistance inherent in the coil 22 or its analogue. In the arrangement shown in Fig. 1, the rejector circuit III is tuned to reject the sound carrier and behaves as a capacitance at the television frequencies in the primary circuit 14, 13, 18, in which the capacity 14 is or includes the anode capacity of the valve 1, the inductance 13 may be shunted by a resistance 15 to broaden the tuning, and the inductance 18 serves to couple the circuits I, II, the condenser 19 is a by-pass condenser for the anode battery B. In the secondary circuit 18, 20, 16, 17, the capacity 20 is a blocking condenser and the capacity 17 is or includes the grid capacity of the valve 7, a grid leak being shown at 25. In a modification, Fig. 2 (not shown), the resistance 26 is tapped off the inductance instead of the capacitance in the rejector circuit III. In a further modification, Figs. 3, 4 (not shown) the bridged tee network III is replaced by a network which has a negative mutual-inductance coupling with the inductance 13. The network III may be variously located in relation to the circuits I, II. The inductance coils 13, 16, 18, 41, 42 are arranged as shown in Fig. 5 on two supporting tubes 50, 51, and surrounded by a screen 52.
GB12341/38A 1937-04-24 1938-04-25 Improvements in or relating to electrical wave filters Expired GB514064A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US138684A US2207796A (en) 1937-04-24 1937-04-24 Band pass amplifier

Publications (1)

Publication Number Publication Date
GB514064A true GB514064A (en) 1939-10-30

Family

ID=22483154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12341/38A Expired GB514064A (en) 1937-04-24 1938-04-25 Improvements in or relating to electrical wave filters

Country Status (2)

Country Link
US (1) US2207796A (en)
GB (1) GB514064A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1183955B (en) * 1963-03-29 1964-12-23 Siemens Ag Attenuation regulator in bridge-T circuit

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103554A (en) * 1963-09-10 Interstage network using cancellation trap
US2527737A (en) * 1944-02-25 1950-10-31 Walter H Jordan Variable frequency band width amplifier
US2585717A (en) * 1946-01-03 1952-02-12 Rca Corp Band pass amplifier
BE474332A (en) * 1946-07-10
US2581159A (en) * 1948-05-28 1952-01-01 Rca Corp Tunable band pass amplifier for television
US2619536A (en) * 1948-12-09 1952-11-25 Zenith Radio Corp Electrical signal network
US2622149A (en) * 1948-12-28 1952-12-16 Rca Corp Equalizer system
US2615983A (en) * 1950-05-05 1952-10-28 Avco Mfg Corp Tuner for television receivers
US2707730A (en) * 1951-05-21 1955-05-03 Rca Corp Amplifier circuits for television picture signal channels
US2835873A (en) * 1954-12-27 1958-05-20 Collins Radio Co Filter
DE1255151C2 (en) * 1965-07-15 1974-06-20 CIRCUIT ARRANGEMENT FOR HIGH FREQUENCY AMPLIFIER WITH A TRANSISTOR AS AMPLIFIER ELEMENT, WHOSE WORKING POINT IS DETERMINED BY A REGULATING VOLTAGE
US3562411A (en) * 1968-09-18 1971-02-09 Zenith Radio Corp Intermediate frequency coupling network with bridged-t sound trap for a color television receiver
CA2355674A1 (en) * 2000-08-21 2002-02-21 Sirific Wireless Corporation Improvements to filters implemented in integrated circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1183955B (en) * 1963-03-29 1964-12-23 Siemens Ag Attenuation regulator in bridge-T circuit

Also Published As

Publication number Publication date
US2207796A (en) 1940-07-16

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