US2085403A - Multirange radio receiver - Google Patents

Multirange radio receiver Download PDF

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Publication number
US2085403A
US2085403A US721367A US72136734A US2085403A US 2085403 A US2085403 A US 2085403A US 721367 A US721367 A US 721367A US 72136734 A US72136734 A US 72136734A US 2085403 A US2085403 A US 2085403A
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United States
Prior art keywords
winding
primary
coil
multirange
short
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Expired - Lifetime
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US721367A
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English (en)
Inventor
Carel Jan Van Loon
Rinia Herre
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RCA Corp
Original Assignee
RCA Corp
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Publication date
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Publication of US2085403A publication Critical patent/US2085403A/en
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    • 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

Definitions

  • the invention relates to the switching-over of radio-receiving apparatus adapted for the reception of a plurality of wavelength ranges.
  • the usual method of switching-over a radio receiving device from one range of wavelengths to another e. g. from the long wave range comprised say between 1,000 and 2,000 meters to the range of shorter waves located between 200 and 600 meters, consists in that for the reception of the shorter waves the coils of the tuned circuits are partly short circuited by means of switches.
  • the receiver comprises a plurality of high-frequency amplification stages which are inductively coupled to one another, it is necessary in such receivers to furnish a switch for each primary and secondary winding of the high frequency transformers which bring about the inductive coupling.
  • Such a method is attended with the drawback that a large number of switches are necessary, that is to say, at least two switches must be provided for each inductively coupled amplification stage.
  • the present invention provides means which render it possible to employ, in the switching-over of high frequency transformers, a smaller number of switches than has hitherto been possible.
  • the means according to the invention consists in the use of a high frequency transformer, the coupling factor or coefficient between the primary and secondary windings of which amounts to about.100%, and the secondary coil of which is subdivided into several parts so that in switching-over from long to short waves only part of the secondary coil is short circuited by means of switch.
  • Fig. 1 is a schematic circuit diagram of two radio frequency amplifier stages coupled according to our invention and Fig. 2 is a schematic circuit diagram of a similar coupling means using a modified form of the invention.
  • Fig. 1 represents a circuit arrangement comprising two thermionic amplifying valves and 2 which are coupled to one another by means of a radio frequency transformer HF consisting of two coils L1 and L2.
  • the primary coil L1 is included in the anode circuit of the amplifying valve 1 whereas the secondary coil L2, which may be tuned to the wave-length desired by means of a variable condenser C, forms part of the grid circuit of the amplifying valve 2.
  • the high frequency transformer consists of a coil which is wound with the aid of a wire consisting of a plurality of conductors (e. g.
  • the input terminals 5, l of valve I are connected respectively to its grid and cathode and may be connected to any desired source of modulated radio frequency currents of a Wide range of frequencies such as an antenna.
  • the plate circuit 8 of valve 2 may include any desired load impedance Z.
  • the coupling coefficient or factor between the primary and secondary windings of the high fre quency transformer has been assumed to be substantially 100%. If, however, the coupling factor is considerably less than this value, it is impossible to obtain a sufficient short circuit of part of the primary winding solely by short circuiting a corresponding part of the secondary winding with the aid of a switch. In this case it may be advantageous to couple both parts to be short circuited to one another by means of a condenser.
  • FIG. 2 Such a circuit arrangement is shown in Fig. 2 in which a condenser Ck is connected between the two parts t and 4 of the primary L1 and the secondary winding L2 respectively of a highfrequency transformer HF, which parts are to be short circuited.
  • a condenser Ck is connected between the two parts t and 4 of the primary L1 and the secondary winding L2 respectively of a highfrequency transformer HF, which parts are to be short circuited.

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  • Amplifiers (AREA)
US721367A 1933-02-17 1934-04-19 Multirange radio receiver Expired - Lifetime US2085403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2085403X 1933-02-17

Publications (1)

Publication Number Publication Date
US2085403A true US2085403A (en) 1937-06-29

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ID=7984171

Family Applications (1)

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US721367A Expired - Lifetime US2085403A (en) 1933-02-17 1934-04-19 Multirange radio receiver

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US (1) US2085403A (en(2012))
BE (1) BE401504A (en(2012))
FR (1) FR768816A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665339A (en) * 1947-11-29 1954-01-05 Patelhold Patentverwertung High and very high frequency tunable circuits
US2843683A (en) * 1956-10-26 1958-07-15 Sarkes Tarzian Television tuner input circuit
US5300904A (en) * 1990-04-17 1994-04-05 Topholm & Westermann Aps Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665339A (en) * 1947-11-29 1954-01-05 Patelhold Patentverwertung High and very high frequency tunable circuits
US2843683A (en) * 1956-10-26 1958-07-15 Sarkes Tarzian Television tuner input circuit
US5300904A (en) * 1990-04-17 1994-04-05 Topholm & Westermann Aps Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying

Also Published As

Publication number Publication date
FR768816A (fr) 1934-08-14
BE401504A (en(2012))

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