GB493622A - Improvements in or relating to frequency converter circuits - Google Patents

Improvements in or relating to frequency converter circuits

Info

Publication number
GB493622A
GB493622A GB10510/37A GB1051037A GB493622A GB 493622 A GB493622 A GB 493622A GB 10510/37 A GB10510/37 A GB 10510/37A GB 1051037 A GB1051037 A GB 1051037A GB 493622 A GB493622 A GB 493622A
Authority
GB
United Kingdom
Prior art keywords
grid
signal
oscillator
cathode
valve
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
GB10510/37A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB493622A publication Critical patent/GB493622A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

493,622. Valve circuits for wireless reception. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 13, 1937, No. 10510. Convention date, April 13, 1936. [Class 40 (v)] In an electron coupled frequency changer a path is provided between the signal grid and local oscillator for applying to the signal grid out of phase local oscillations to reduce the effect of second and higher order demodulation products causing interference. Fig. 3 shows a valve 1 with the signal applied to the control grid 6 adjacent the cathode and the local oscillation applied to the grid 7 and also through condenser 10 and to the grid 6. In a modification, Fig. 2 (not shown), the signal is applied to the grid 7 and the local oscillation to the grid 6 adjacent the cathode and also to the grid 7. The auxiliary coupling of the local oscillator may be magnetic, Fig. 4 (not shown), or by a condenser common to the signal and oscillator tuned circuit, Fig. 5 (not shown), or by magnetic coupling to the cathode lead, Fig. 6 (not shown). Fig. 7 shows a separate local oscillator coupled to the grid 7 and through a phase inverting valve 21 to the grid 6 to which the signal is applied. The cancellation voltage for the second and higher order demodulation products is varied by the application of automatic volume control to the frequency changer. This variation is compensated by varying the mutual conductance of the phase inverter 21 in the opposite sense by grid bias control through resistance 23 from the potentiometer 25, 26 in the screen circuit of the valve 1. In a modification, Fig. 8 (not shown), the automatic gain control voltage is applied to both signal and oscillator grids, when, if the oscillator grid draws little current the two grids will vary in the same sense but at different rates, the grid next to the cathode to which the signal is applied varying less than the grid to which the local oscillation is applied. Specification 454,996 is referred to.
GB10510/37A 1936-04-13 1937-04-13 Improvements in or relating to frequency converter circuits Expired GB493622A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73998A US2111764A (en) 1936-04-13 1936-04-13 Signal converter circuit

Publications (1)

Publication Number Publication Date
GB493622A true GB493622A (en) 1938-10-12

Family

ID=22117086

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10510/37A Expired GB493622A (en) 1936-04-13 1937-04-13 Improvements in or relating to frequency converter circuits

Country Status (2)

Country Link
US (1) US2111764A (en)
GB (1) GB493622A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511107A (en) * 1942-11-11 1950-06-13 Philip H Greeley Radio receiving circuit
US2614214A (en) * 1945-08-06 1952-10-14 Gilbert J Perlow Panoramic receiver
US2617017A (en) * 1948-05-29 1952-11-04 Hartford Nat Bank & Trust Co Mixing circuit
US2653224A (en) * 1949-04-29 1953-09-22 Rca Corp Frequency converter system

Also Published As

Publication number Publication date
US2111764A (en) 1938-03-22

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