US2195888A - Heterodyne receiver - Google Patents

Heterodyne receiver Download PDF

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Publication number
US2195888A
US2195888A US167519A US16751937A US2195888A US 2195888 A US2195888 A US 2195888A US 167519 A US167519 A US 167519A US 16751937 A US16751937 A US 16751937A US 2195888 A US2195888 A US 2195888A
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US
United States
Prior art keywords
waves
reception
beat frequency
receiver
short
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 - Lifetime
Application number
US167519A
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English (en)
Inventor
Kramar Ernst
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz 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
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2195888A publication Critical patent/US2195888A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/24—Apparatus or circuits at the receiving end
    • H04L15/26—Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61G—COUPLINGS; DRAUGHT AND BUFFING APPLIANCES
    • B61G11/00—Buffers
    • B61G11/14—Buffers absorbing shocks by mechanical friction action; Combinations of mechanical shock-absorbers and springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems

Definitions

  • the reception of short waves is in general on the heterodyne principle, that is to say, the received frequency is superimposed on a. second frequency while the intermediate or beat frequency thus produced is amplified and rectified.
  • the beat frequency employed is in general a constant frequency that belongs to the range of the mean waves that is, between short waves and long waves. For instance, a wave of some 100 meters is used with a reception of waves of 50 meters. It is' well-known to employ the beat frequency part for the reception of waves of the mean range. To such end means is provided to change from short waves to long waves in such a manner that in the case of a short-wave reception a heterodyning arrangement is used while with long-wave reception the beat frequency part of the short-wave receiver is employed. 20 In arrangements as provided by the invention a heterodyne receiver while receiving short waves is at the same time in readiness for the reception of a second wave. This second wave may serve for the reception of distress signals, for example.
  • Distress signals are in general given on a wave of 600 meters. It has been customary to have an additional receiver kept in readiness for receiving these signals. The invention does away with such second receiver, and thus avoids a separate attendance, by arranging to have the beat frequency part of a short-wave receiver in constant readiness of reception as regards distress signals, the attendant to this receiver thus also attending to the distress call receiver. 35
  • Fig. 1 is a wiring diagram representing one embodiment of the invention
  • Fig. 2 is a wiring diagram showing a modication of the device illustrated in Fig. 1.
  • a short-wave receiver connected to an antenna A by an inductive coupling 4, comprises a heterodyning part l, in which the received fre- (CL o- 20) quency is amplified and superimposed with another frequency, and also comprises a beat frequency part 2 in which the intermediate or beat frequency produced in part l is amplified and rectified.
  • the beat frequency is preferably made to accord with that frequency for which an additional readiness for reception is to be provided.
  • Part 2 is connected to antenna A by an inductive coupling 5, in such a manner as to prevent the short waves received over coupling transformer 4 from being fed back to antenna A over transformer 5.
  • a radio receiving arrangement for receiving waves' of different frequencies comprising an antgma, a superheterodyne receiver having a mquency converting part for producing a beat frequency from one of said received waves, means to 1 rt to said antenna, and a beat frequency amp i er p coupled to the output of said converter part, a
  • v circuit also connecting the input side of said amplier-rectier part to said antenna for direct reception of waves of the frequency of said beat frequency, said circuit including coupling means separate from the first mentioned coupling means whereby energy from said converter tends to feed back to said antenna, and a rejector circuit interposed between the last mentioned coupling means and the amplifier-rectifier, part to prevent feedback from the output of said converter part to said antenna.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)
US167519A 1936-10-07 1937-10-06 Heterodyne receiver Expired - Lifetime US2195888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE750716T 1936-10-07

Publications (1)

Publication Number Publication Date
US2195888A true US2195888A (en) 1940-04-02

Family

ID=6544118

Family Applications (1)

Application Number Title Priority Date Filing Date
US167519A Expired - Lifetime US2195888A (en) 1936-10-07 1937-10-06 Heterodyne receiver

Country Status (6)

Country Link
US (1) US2195888A (en:Method)
BE (1) BE382543A (en:Method)
DE (1) DE750716C (en:Method)
FR (1) FR827205A (en:Method)
GB (1) GB490485A (en:Method)
NL (1) NL47611C (en:Method)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764713C (de) * 1938-11-12 1953-06-08 Aeg Verfahren zur UEbertragung eines Anrufsignals zu einem bereits mit einem anderen Sender in Verbindung stehenden Empfaenger fuer frequenzmodulierte Schwingungen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392979C (de) * 1922-06-25 1924-03-31 Erwin Kindler Sende- und Empfaengerschaltung fuer Mehrfachtelegraphie und -telephonie auf einer Welle
FR699825A (fr) * 1930-07-18 1931-02-20 Dispositif permettant d'adapter un radio-récepteur à la réception d'ondes qu'il ne peut recevoir directement
DE600193C (de) * 1932-07-02 1935-09-28 Telefunken Gmbh Einrichtung zur Anzeige sowohl der Flugzielrichtung mittels Empfangs auf laengeren Wellen als auch der Landungsfeldstaerke mittels Empfangs von ultrakurzen Wellen
CH169877A (de) * 1933-09-07 1934-06-15 Komet Radio A G Zusatzgerät für Radioempfänger zur Erweiterung des Wellenbereiches auf lange Wellen.

Also Published As

Publication number Publication date
DE750716C (de) 1945-01-26
FR827205A (fr) 1938-04-21
NL47611C (en:Method) 1940-01-15
BE382543A (en:Method) 1931-10-31
GB490485A (en) 1938-08-16

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