US2062434A - Radio receiving system - Google Patents

Radio receiving system Download PDF

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Publication number
US2062434A
US2062434A US629251A US62925132A US2062434A US 2062434 A US2062434 A US 2062434A US 629251 A US629251 A US 629251A US 62925132 A US62925132 A US 62925132A US 2062434 A US2062434 A US 2062434A
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United States
Prior art keywords
frequency
circuit
range
coupling
receiver
Prior art date
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Expired - Lifetime
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US629251A
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English (en)
Inventor
Jacob Van Slooten
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RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
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Application granted granted Critical
Publication of US2062434A publication Critical patent/US2062434A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges

Definitions

  • this variation usually occurs in such a sense that the sensitivity is greater with the high frequencies, whereas the selectivity is less than in the case of receiving low frequencies.
  • the present invention has for its purpose to provide an arrangement in which this drawback is entirely or greatly avoided.
  • the invention consists in a combination with one or more of the tubes pertaining to the arrangement, of a complex of two or more tuning circuits interposed, preferably before the first tube, said circuits being coupled together capacitively.
  • this quasi-aperiodic system may in accordance with the invention be composed in such a Way that the impedance decreases between the longest wave of the short waves and the shortest wave of the long waves, whereupon it increases again.
  • a constant sensitivity in one frequency range may be obtained by using a quasi-aperiodic coupling system having a resonant frequency in the vicinity of the lowest frequency of the frequency range. In this case, however, the sensitivity is not constant in another frequency range. Therefore, according to the present invention a switching arrangement is provided in the quasi-aperiodic circuit which is adapted to insert a capacity in this circuit. If the coupling circuit is of the choke coil type the choke coil is arranged so as to have a resonance frequency which lies in the vicinity of the lowest frequency of the short wave range. It is thus seen that when the capacity is not inserted in the circuit the sensitivity of the receiver is constant in the short wave range.
  • the capacity is switched in; in this case the resonance frequency of the quasi-aperiodic circuit is made to lie within the vicinity of the lowest frequency of the long wave range and a constant amplification of all frequencies lying within this long wave range will be obtained.
  • two parallel paths are connected across the coupling impedance one of which favors long waves.
  • the other parallel path is in effect a tuned circuit which is tuned to a point somewhere between the two frequency ranges. This arrangement prevents the sensitivity increasing from one end of one frequency range to the other end of the other frequency range.
  • Fig. 1 shows the principle diagram of the re-. ceiver so far as it is of importance for the invention.
  • Fig. 2 is a modified form of construction of the quasi-aperiodic coupling.
  • the arrangement represented in Fig. 1 comprises two high frequency valves V1 and V2 and a detector D.
  • the succeeding low frequency part to which the invention does not bear relevance, is not represented.
  • a coupling between the valve V2 and the detector D consisting of a choke coil Sm with a parallel condenser Cp which may be switched off.
  • the choke coil is so constructed that its resonant point lies just above the longest wave of the short waves. When receiving in this range the condenser Cp is switched off.
  • the path LC1 is tuned to about 1000 m.
  • the resonance curve A of the system represented in Fig. 3 shows consequently a fall between 600 m. and 1000 m. whereupon it ascends again.
  • the selectivity or the sensitivity or both may be kept substantially constant over the whole range of wave lengths for which a receiving set is constructed.
  • an electrical arrangement of the type which is adapted to be connected with an electronic relay said electrical arrangement including input terminals and output terminals, said input terminals being connected to a source of signal energy through a tunable circuit, said tunable circuit being provided with a tuning element adapted to tune the circuit to any frequency within a predetermined range of frequen cies and with operable means for adapting said tunable circuit so that it may be tuned to any frequency within another predetermined range of frequencies, said tunable circuit having an inherent rising sensitivity characteristic with increasing frequency to whichthe circuit is tuned, a utilizing circuit, a circuit including an inductance element for connecting the output terminals to the utilizing circuit, said connecting circuit being resonant at a frequency which is in the vicinity of the lowest frequency of one of said frequency ranges and means, acting upon operation of the operable means to condition the tunable circuit so as to tune to the other range of frequencies, to change the resonance of said connecting circuit so that the connecting circuit becomes resonant at the frequency which is in the vicinity of the
  • a coupling system for transferring energy from a source of radio frequency energy to the input of an electronic tube, the energy to be transferred through said coupling from said source being of. two separated frequency ranges, said coupling system including a load impedance element connected across the source, a pair of parallel paths shunted across said load impedance, one of said paths comprising a condenser, the other of said paths comprising an inductance and a tuning condenser therefor, said latter path being resonant at a frequency which is between said two frequency ranges whereby said coupling system has a rising impedance characteristic with decreasing frequencies along both said frequency ranges and a rising impedance characteristic for increasing frequencies lying between said two frequency ranges.
  • a tunable radio frequency circuit having input terminals and output terminals, means for connecting the input terminals to a source of radio frequency energy
  • a tunable radio frequency circuit having an input circuit and an output circuit, said input circuit being provided with means for connection to a source of radio frequency energy, an electrical network having an input circuit and an output circuit, means for coupling the output circuit of the radio frequency circuit to the input circuit of the electrical network including an inductance coil connected across the radio frequency circuit output circuit, said coupling means having an anti-resonant frequency which is in the vicinity of the lowest frequency of one of the frequency ranges for which the receiver is adapted, selective switching means for altering the receiver so as to tune to the various frequency ranges and means operable simultaneously with the operation of the switching means for changing the anti-resonant frequency of the coupling means so that the antiresonant frequency thereof is always in the vicinity of the lowest frequency of whichever one of the frequency ranges the receiver is adjusted for.
  • a coupling system for transferring energy from a source of radio frequency to the input of an electronic tube, switching means for adapting the receiver to tune through any one of a plurality of different frequency ranges, a circuit including an inductance coil connected across the source, said circuit having an anti-resonant frequency which is in the vicinity of the lowest frequency of one of said ranges and means acting in conjunction with the switching means when said switching means is operated to change the receiver from one of the frequency ranges to another thereof for altering the anti-resonant frequency to a frequency which is in the vicinity of the lowest frequency of the frequency range through which the receiver is adapted to be tuned.
  • a coupling system for transferring energy from a source of radio frequency to the input of an electronic tube, switching means for adapting the receiver so as to tune to any one of a plurality of different frequency ranges, circuit means including an in-- ductance coil connected across the source, said circuit means having an anti-resonant frequency which is below the lowest frequency of one of said ranges and means acting in conjunction with the switching means, when said switching means is operated so as to adapt the receiver for tuning to another of the frequency ranges, for changing the natural frequency of the circuit means to a frequency which is in the vicinity of the lowest frequency of the last named frequency range.
  • a tunable radio frequency circuit having an input circuit and an output circuit, means for connecting said input circuit to a source of radio frequency energy, a relay including an electronic tube provided with an input circuit and output circuit, means inrising impedance characteristic with decreasing frequency for all of the different frequency ranges to which the receiver may be adjusted and an increasing impedance characteristic with increasing frequency between the desired frequency 5 ranges.

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US629251A 1931-08-18 1932-08-18 Radio receiving system Expired - Lifetime US2062434A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2062434X 1931-08-18

Publications (1)

Publication Number Publication Date
US2062434A true US2062434A (en) 1936-12-01

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ID=19873588

Family Applications (1)

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US629251A Expired - Lifetime US2062434A (en) 1931-08-18 1932-08-18 Radio receiving system

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US (1) US2062434A (enrdf_load_stackoverflow)
BE (1) BE390106A (enrdf_load_stackoverflow)

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BE390106A (enrdf_load_stackoverflow)

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