GB1412385A - Multi-circuit selection filter for two different frequency ranges - Google Patents

Multi-circuit selection filter for two different frequency ranges

Info

Publication number
GB1412385A
GB1412385A GB106874A GB106874A GB1412385A GB 1412385 A GB1412385 A GB 1412385A GB 106874 A GB106874 A GB 106874A GB 106874 A GB106874 A GB 106874A GB 1412385 A GB1412385 A GB 1412385A
Authority
GB
United Kingdom
Prior art keywords
frequency range
higher frequency
diode
filter
circuit
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
GB106874A
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.)
SABA GmbH
Original Assignee
SABA GmbH
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 SABA GmbH filed Critical SABA GmbH
Publication of GB1412385A publication Critical patent/GB1412385A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • 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

Abstract

1412385 Radio receiving apparatus SABA SCHWARZWAELDER APPARATE - BAUANSTALT AUGUST SCHWER SOEHNE GmbH 9 Jan 1974 [24 Jan 1973] 1068/74 Heading H3Q A selection filter for two different frequency ranges as used between an HF preamplifier stage 1 and a mixer stage 2 of a television receiver, and using in each case series connected primary and secondary circuits 4, 6 and 5, 7 respectively for the two ranges, comprises a diode 22 connected in parallel to the first primary circuit 4 for the lower frequency range so that upon operation of the filter in the higher frequency range diode 22 short-circuits the first primary winding by means of a switching voltage Us applied to the diode 22 and is adapted to connect the second primary circuit 6 for the higher frequency range to the output of the preamplifier stage 1, coupling of the signals of the higher frequency range to the mixer stage 2 being capable of taking place via circuit capacitive components 9, 13 in a first secondary circuit 5 of the filter for the lower frequency range, in a way such that the coupling capacity decreases towards the upper band end of the higher frequency range and increases towards the lower. As shown, tuning is by means of varactor diodes 8, 9,10,11 but variable capacitors may be used instead.
GB106874A 1973-01-24 1974-01-09 Multi-circuit selection filter for two different frequency ranges Expired GB1412385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2303302A DE2303302B1 (en) 1973-01-24 1973-01-24 Two-circuit selection filter for two different frequency ranges

Publications (1)

Publication Number Publication Date
GB1412385A true GB1412385A (en) 1975-11-05

Family

ID=5869788

Family Applications (1)

Application Number Title Priority Date Filing Date
GB106874A Expired GB1412385A (en) 1973-01-24 1974-01-09 Multi-circuit selection filter for two different frequency ranges

Country Status (7)

Country Link
BE (1) BE809532A (en)
CH (1) CH558988A (en)
DE (1) DE2303302B1 (en)
FR (1) FR2215000B1 (en)
GB (1) GB1412385A (en)
IT (1) IT1006898B (en)
NL (1) NL7400075A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1791222A1 (en) * 1967-04-29 1971-08-26 Philips Patentverwaltung Circuit arrangement for tuning
ES359059A1 (en) * 1968-10-11 1970-05-16 Fagor Electrotecnica Sci A uhf and vhf tuner for television

Also Published As

Publication number Publication date
FR2215000A1 (en) 1974-08-19
BE809532A (en) 1974-05-02
IT1006898B (en) 1976-10-20
NL7400075A (en) 1974-07-26
FR2215000B1 (en) 1976-10-08
DE2303302B1 (en) 1974-07-11
CH558988A (en) 1975-02-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee