GB1324679A - Radio receivers - Google Patents

Radio receivers

Info

Publication number
GB1324679A
GB1324679A GB3136972A GB3136972A GB1324679A GB 1324679 A GB1324679 A GB 1324679A GB 3136972 A GB3136972 A GB 3136972A GB 3136972 A GB3136972 A GB 3136972A GB 1324679 A GB1324679 A GB 1324679A
Authority
GB
United Kingdom
Prior art keywords
frequency
mixer
amplifier
stage
mixer stage
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
GB3136972A
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.)
Siemens AG
Original Assignee
Siemens AG
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
Priority claimed from DE19712140680 external-priority patent/DE2140680C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1324679A publication Critical patent/GB1324679A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
    • H03D7/163—Multiple-frequency-changing all the frequency changers being connected in cascade the local oscillations of at least two of the frequency changers being derived from a single oscillator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Transmitters (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

1324679 Frequency changing circuits; radio signalling SIEMENS AG 5 July 1972 [13 Aug 1971] 31369/72 Headings H3T and H4L In a V.H.F. radio receiving arrangement which includes one or more frequency converters each tuned to the frequency of a radio signal, which frequency converter converts the received signal to an intermediate frequency in a first mixer stage 6 and subsequently converts it from the intermediate frequency, in a second mixer stage 11, to either the original frequency or that of another V.H.F. channel, the local oscillation source 12 for the second mixer stage 11 comprises an amplifier which acts as a buffer stage connected to the oscillator 7 of the first mixer stage 6, when conversion is made to the original frequency, or alternatively as an independent oscillator for conversion to the frequency of a different channel. In the embodiment the signal input, derived either from terminal 2, or via switch 5 from a directional coupler is amplified in an R.F. amplifier 1 comprising a field-effect transistor; the mixer 6 also comprises a fieldeffect transistor. An I.F. amplifier 10 giving symmetrical limiting is employed, preceded and followed by ceramic or crystal filters 8, 9. The second mixer 11 comprises a ring modulator.
GB3136972A 1971-08-13 1972-07-05 Radio receivers Expired GB1324679A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712140680 DE2140680C3 (en) 1971-08-13 Receiving station for VHF audio broadcast signals
DE19792902650 DE2902650A1 (en) 1971-08-13 1979-01-24 RECEIVING CENTER FOR VHF SOUND BROADCAST SIGNALS

Publications (1)

Publication Number Publication Date
GB1324679A true GB1324679A (en) 1973-07-25

Family

ID=25761597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3136972A Expired GB1324679A (en) 1971-08-13 1972-07-05 Radio receivers

Country Status (4)

Country Link
CH (1) CH538784A (en)
DE (1) DE2902650A1 (en)
GB (1) GB1324679A (en)
NL (2) NL175867C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322984A (en) * 1997-02-19 1998-09-09 Northern Telecom Ltd Mixing circuits
EP1710907A1 (en) * 2005-04-05 2006-10-11 Siemens Schweiz AG System for power optimized audio signals reproduction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322984A (en) * 1997-02-19 1998-09-09 Northern Telecom Ltd Mixing circuits
GB2322984B (en) * 1997-02-19 1999-04-14 Northern Telecom Ltd Transceiver bandwidth extension using double mixing
US6115363A (en) * 1997-02-19 2000-09-05 Nortel Networks Corporation Transceiver bandwidth extension using double mixing
EP1710907A1 (en) * 2005-04-05 2006-10-11 Siemens Schweiz AG System for power optimized audio signals reproduction
WO2006106038A1 (en) * 2005-04-05 2006-10-12 Siemens Schweiz Ag System for performance-optimized voice rendition

Also Published As

Publication number Publication date
NL8000468A (en) 1980-07-28
NL175867C (en) 1985-01-02
DE2902650A1 (en) 1980-07-31
DE2140680B2 (en) 1976-04-08
CH538784A (en) 1973-08-15
DE2140680A1 (en) 1973-02-22
NL175867B (en) 1984-08-01
NL7208423A (en) 1973-02-15

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Legal Events

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