US2141730A - Radio receiving system - Google Patents

Radio receiving system Download PDF

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Publication number
US2141730A
US2141730A US102685A US10268536A US2141730A US 2141730 A US2141730 A US 2141730A US 102685 A US102685 A US 102685A US 10268536 A US10268536 A US 10268536A US 2141730 A US2141730 A US 2141730A
Authority
US
United States
Prior art keywords
cos
signal
detector
voltage
radio receiving
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
US102685A
Other languages
English (en)
Inventor
Carel Jan Van Loon
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US2141730A publication Critical patent/US2141730A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/12—Trolley lines; Accessories therefor
    • B60M1/26—Compensation means for variation in length
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/02—Details
    • H03D1/04—Modifications of demodulators to reduce interference by undesired signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/08—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements
    • H03D1/10—Demodulation of amplitude-modulated oscillations by means of non-linear two-pole elements of diodes
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements

Definitions

  • the voltage supplied to the detector amounts in this case to: I
  • w-I-(J) t [X(1+m cos 1915) +1 cos qtl.cosw t-Y sin qt. sin wt
  • the current supplied to the loudspeaker is directly proportional to X2 2 2 Y
  • the above expression for R may be rewritten:
  • the high-frequency oscillations set up across an oscillatory circuit K are supplied via condensers C1 and C2, high-frequency choke coils S1 and S2 7 and condensers C3 and C4 to two diode detectors D1 and D2, which results in the production of a low-frequency voltage drop in resistances R1 and R2.
  • the condensers C1 and C2 and the resistances R1 and R2 are so chosen that the two detectors have different time constants and therefore different modulation suppression factors.
  • the low-frequency voltage drop across part of the resistances R1 and R2 is supplied to the control gridsof push-pull connected amplifying tubes B1 and B2.
  • the tapping points on the resistances R1 and R2 are so chosen that the amplitude of the undesired signal on the control grids of the two amplifying tubes is the same. Only the desired signal is present in this case in the secondary winding S of the balancing transformer.
  • n the demodulation factor
  • the current flowing through the primary of the output transformer of the valves Bi and B2 may therefore be represented by where S1 and S2 are the mutual conductances of the valves B1 and B2.
  • the intensity'ratio of the two signals be 1/5. This ratio may be decreased to 1/20 by the detector D1 and to l/50 by the detector D2.
  • the voltage'in the output circuit of the detector D1 due to the strongersignal may be 1 volt and the voltage due to the weaker signal 0.05 volt, whereas in the output circuit of the detector D2 the voltage'due to the stronger signal may again be 1 volt, and the voltage due to the weaker signal 0.02 volt.
  • a circuit arrangement comprising a tuned input circuit, a pair of diode rectifiers, the anode and cathode of each rectifier being connected across the tuned circuit through a condenser, a load resistor in the output circuit of each rectifier, the coupling condensers and the load resistors being so proportioned that the rectifiers have different time constants, an output amplifier stage having two tubes which have their output circuits connected in push-pull, and a variable tap connection from each loadresistor to one of the grids of the push-pull tubes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mechanical Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Amplifiers (AREA)
US102685A 1935-10-26 1936-09-26 Radio receiving system Expired - Lifetime US2141730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE465333X 1935-10-26

Publications (1)

Publication Number Publication Date
US2141730A true US2141730A (en) 1938-12-27

Family

ID=6540382

Family Applications (1)

Application Number Title Priority Date Filing Date
US102685A Expired - Lifetime US2141730A (en) 1935-10-26 1936-09-26 Radio receiving system

Country Status (4)

Country Link
US (1) US2141730A (enrdf_load_html_response)
FR (2) FR465333A (enrdf_load_html_response)
GB (1) GB465333A (enrdf_load_html_response)
NL (1) NL47698C (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418389A (en) * 1945-07-21 1947-04-01 Gilbert J C Andresen Automatic limiter system
US3057995A (en) * 1960-07-05 1962-10-09 Hughes Aircraft Co Mean level detector
US3735037A (en) * 1970-08-28 1973-05-22 Communications Patents Ltd Television demodulator with short and long time constants
US20030166489A1 (en) * 2001-12-20 2003-09-04 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Process for production of detergent tablets

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418389A (en) * 1945-07-21 1947-04-01 Gilbert J C Andresen Automatic limiter system
US3057995A (en) * 1960-07-05 1962-10-09 Hughes Aircraft Co Mean level detector
US3735037A (en) * 1970-08-28 1973-05-22 Communications Patents Ltd Television demodulator with short and long time constants
US20030166489A1 (en) * 2001-12-20 2003-09-04 Unilever Home & Personal Care Usa, Division Of Conopco, Inc. Process for production of detergent tablets

Also Published As

Publication number Publication date
FR812495A (fr) 1937-05-11
FR465333A (fr) 1914-04-14
GB465333A (en) 1937-05-05
NL47698C (enrdf_load_html_response)

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