US1712036A - Electrical signaling system and signaling method - Google Patents

Electrical signaling system and signaling method Download PDF

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Publication number
US1712036A
US1712036A US751031A US75103124A US1712036A US 1712036 A US1712036 A US 1712036A US 751031 A US751031 A US 751031A US 75103124 A US75103124 A US 75103124A US 1712036 A US1712036 A US 1712036A
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United States
Prior art keywords
frequency
circuit
waves
filter
tuning
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Expired - Lifetime
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US751031A
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English (en)
Inventor
Alfred N Goldsmith
Arthur F Van Dyck
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RCA Corp
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RCA Corp
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Publication date
Priority to FR243371D priority Critical patent/FR243371A/fr
Priority to NL18312D priority patent/NL18312C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US751031A priority patent/US1712036A/en
Priority to GB29246/25A priority patent/GB243371A/en
Application granted granted Critical
Publication of US1712036A publication Critical patent/US1712036A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Definitions

  • Our invention relates to electrical systems and particularly tov electrical signaling systems for the reception and detectin of signal waves by utilizing the principle o so-called beats.
  • One of the principal objects of our invention is the provision of systems utilizing the beat frequency principle in which substantially only one adjustment of the device for c generating the auxiliary frequency is .pos-
  • Another principal object of our invention is the provision of a system utilizing the beat frequency principle in which With a certain adjustment of the device for generating the auxiliary frequency, the desired beat frequency is produced only from the desired signal Waves and not from certain undesired signal Waves.
  • Another obj ect of ourfinvention is the simplification of the controls in such systems.
  • Fig. 1 is a schematic diagram of a simple heterodyne system
  • Fig. 2 is a schematic diagram'o'f a simple autodyne system and Fig. a schematic diagram of a combined autodyne' and reflexing system.
  • an antenna 1 is connected to ground Gr ⁇ through the primary winding of the coupling de vice 2, the sec- Plldfy Wllng 0f Whlcll 1S connected to the input terminals of an electrical filter A.
  • A'varlable condenser 3 is connected in shunt with the secondary winding for properly tuning the antenna circuit to the incoming slgnal Waves.
  • the electrical filter A is of the low pass type and comprises av plurality of reactance coils 4 connected in series and a. plurality of variable condensers 5 connected 1n shunt as shown.
  • the output terminals of the filter A are connected to the input terminals of a detector device as shown.
  • the local oscillation generator is inductively coupled to one of the output leads of the filter A as shown.
  • the output terminals of the detector device may be connected to the sound reproductive device 6 through a plurality of audio frequency amplifiers as shown.
  • an antenna 10 is connected to ground G through the primar winding of a coupling device 11, the secon ary Winding of which is connected to the input terminals of electrical filter B.
  • a variable condenser 12 is connected in shunt with the secondary winding for properly tuning the antenna circuit to the incoming'signal waves.
  • the filter B is of the loW pass type and comprises a plurality of reactance coils connected in series and a plurality of variable condensers 14 connected in shunt as shown.
  • the output terminals of filter B are inductively coupled tothe combined detector and oscillation generator by means of the coupling device 15.
  • the output terminals of the detector and oscillation generator may be connected to the sound reproductive device 16 through a plurality of audio frequency amplifiers as shown.
  • an antenna 2O is connected to ground G through the primary winding of inductive coupling deviceQl, the secondary Winding of which is connected to the input terminals of an electrical filter C.
  • a variable condenser 22 is shunted across the secondary Winding for properly tuning the antennacircuit to the incoming signal waves.
  • the filter C which is of the loW pass type, comprises a plurality of reactance coils 23 connected in series and a plurality of variable condensers Q4 connected in shunt as shown.
  • the outputterminals of the filter C are @0nnected ⁇ across the grid filament of 3element tube 25 which serves as a radio frequency amplifier.
  • the plate of tube 25 is connected to the grid of the combined oscillating and detecting tube 26 through a small blocking condenser 27 for preventing the impression of the B battery voltage of the plate filament circuit of tube 25 on the grid element of the tube 26.
  • An inductance coil 27 is connected across the grid and filament of tube 26, a variable tuning condenser 28 being connected in shunt with the said coil.
  • the plate filament circuit of tube 26 comprises the plate battery B1, primary winding of beat frequency transformer 29 and a tickler coil 30 inductively coupled to the inductance coil 27, the battery B1 with primary winding of beat frequency transformer 29 and the tickler coil 30 all being connected in series.
  • a condenser 31 is shunted across the primary winding of transformer 29 for bypassing the high frequency oscillations and for tuning the transformer to the desired beat frequency and a blocking condenser 32 is so connected in one of the leads connecting one of the output terminals of the filter C to the grid of tube 25 as to prevent the intermediate frequency oscillations being impressed on the antenna and'at the same time so connected as to be excluded fromthe antenna and filter circuits.
  • the secondary winding of beat frequency transformer 29 is connected across the gridfilament of tube 25, the connection to the grid of tube 25 being made between the grid and the condenser 32.
  • the plate-filament circuit of tube 25 also comprises the primary Winding of beat frequency transformer 33 and a B-battery both connected in series, the connection to the plate of tube 25 not including the condenser 27.
  • the secondary Winding of beat frequency transformer 33 is connected across the input terminals of the beat frequency amplifier.
  • the output terminals of the beat frequency amplifier are connected to the input terminals of the detector device as shown.
  • the output terminals of the detecto-r device may be connected to a sound reproductive device 35 through a plurality of audio frequency amplifiers as shown.
  • the filaments of the various tubes may be supplied with heating current from a shitable source of power A1 and the currents in the individual filaments may be independently controlled by the various rheostats R.
  • the antenna tuning condenser, the filter condensers and the oseillation generator are all preferably simultaneously controlled by a single control device as shown, thereby eliminating the disadvantage of multiplicity of controls.
  • the antenna circuit when the single control device is moved to a predetermined position the antenna circuit is tuned to signal waves of a certain frequency the cut-off point of the electrical filter is simultaneously adjusted to prevent the passage of interfering waves and the oscillation generator is also simultaneously adjusted to generate an auxiliary frequency of the proper value to combine with the desired signal waves.
  • the signal waves to be detected possess afrequency of 600 kilocycles.
  • the single control element is moved to a predetermined position which simultaneously tunes the antenna circuit to the 600 kilocycle signal Waves, the oscillation generator circuit to cause the generator to produce an auxiliary frequency of say 610 kilocycles and the electrical filter to prevent the passage of waves having a greater frequency than a value slightly above the frequency of their signal ⁇ waves, 600 kilocyeles in this concrete example.
  • the 600 kilocycle signal waves and the 610 kiloeyele auxiliary combine to produce 10 kilocycle beats, which are detected and amplified. It is thus apparent that the desired beat frequency waves are only obtainable from signal waves of a certain frequency when the single control device oceuples one predetermined position rather than a plurality of positions when a separate control device is employed for the oscillation generator.
  • Undesired Waves of say 580 kilocycles would then be prevented from combining with the auxiliary Waves of 590 kilocycles to produce the desired l0 kilocycle beat frequency Waves. Interference .would be similarly prevented in this case also.
  • the single control device is moved to a predetermined position which simultaneously operates, first: the condenser 22 to tune the antenna circuit to the frequency 0f the desired signal waves, second: the condenser 28 to properly tune the plate circuit of the oscillation generator 26 to cause it to generate auxiliary waves at a frequency equal to the frequency of the signal waves plus the frequency-of the desired beat frequency Waves and third: the condensers 24 of the low pass filter C to properly tune the low pass filter C to prevent the passage of Waves having a frequency greater than the frequency of the desired Waves.
  • the incoming signal Waves are impressed on the id filament of the radio frequency amplifying tube 25 Where they are amplified. These oscillations are then impressed on the grid of the combined oscillating and detecting tube 26.
  • the tube 26 is made to produce auxiliary waves of a frequency equal to the frequency ofthe incoming signal waves plus the desired beat plate-filament circuit of tube 26 are now impressed on the grid and filament of tube 25 y means of the beat frequency transformer 29, the condenser 31 by-passing al1 the high frequency oscillations and also serving to tune the plate filament ⁇ circuit of tube 26 to the desired beat frequency Waves.
  • the beat frequency amplifier 'lhe output terminals of the beat frequency amplifier are connected to the input side of the detector in which the beat frequency oscillations are detected.
  • the audio frequency oscillations appearing in the output side of the detector are now impressed on the sound reproductive device 35 through a plurality of audio frequency amplifiers as shown.
  • the electrical -filter C may be of the high pass type, low
  • a vaiiably tuned input circuit a variably tuned oscillator circuit for generating a beat frequency
  • a tuned intermediate frequency circuit for amplifying the beat frequency
  • a timed filter circuit said last mentioned circuit being adapted to filters cuit.
  • a super-heterodyne receiver the combination of an input circuit, a variable condenser for tuning said circuitto the frequency being received, an oscillator circuit for generating the beat frequency, a variable condenser for varying the frequency of the oscillator circuit, an intermediate frequency circuit for amplifying the beat frequency and a filter circuit including a plurality of condensers for varying the frequency, which the said filter circuit isadapted-to filter and prevent an undesired frequency being passed which would, in combination with the oscillator frequency, produce a beat frequency ampliiiable by said intermediate frequency circuit.
  • a super-heterodyne receiver the combination of an input circuit, a variable condenser for tuning said circuit to the frequency being received, an oscillator circuitI foi ⁇ generating a beat frequency, a variable condenser for varying the frequency of the oscillator circuit, a tuned intermediate frequency c1rcuit,fa filter circuit comprising a plurality of condensers for varying the frequency which the said filter circuit is adapted to filter and prevent undesirable signals being passed, which would, in combination with the oscillator frequency, produce abeat amplifiable by said intermediate circuit and a single control device for simultaneously vvarying all of said condensei's and therefore the frequency to which the receiver is set to receive.
  • a radio receiving system comprising means for tuning its input, adjustable means for reducing 'a desired signal frequency simultaneously with a materially different interfering frequency to the same lower fre uency, variable means for removing the un esired frequency and means common to the three above mentioned means for varying them simultaneously.
  • a radio receiving set utilizing the beat note method of signal reception, employing an input circuit, an oscillator circuit and a frequency selective impedance associated with the inputcircuit, the method of ,reducing interference which consists in tuning the frequency selective impedance and the input circuit to different frequencies, each of these frequencies differing from that of theoscillator circuit by the same amount, and maintaining the abovestated frequency relation of the two circuitsand the frequency selective impedance throughout the range of the set.
  • a signal responsive system comprising an input circuit including tuning means, an oscillator circuit including tuning means, a filter circuit including timing means, means for mechanically coupling said tuning means for simultaneous adjustment to maintain con stant the difference of the input and oscillator circuit frequencies and to maintain the filter circuit so tuned as to filter outa-n undesired freqluency which differs from the frequency of tie oscillator circuit by an amount equal to half ⁇ the difference between said undesired frequency and the frequency of said input circuit.
  • a signal responsive system comprising an input circuit with tuning means, an oscillator circuit including vtuning means, an absorption circuit including tuning means and an intermediate frequency amplifier, the method of eliminating interference which consists in tuning the input circuit to the desired signal frequency, tuning the oscillator circuit for a frequency differing from that of the input circuit by the frequency for Which the intermediate frequency amplifier is designed, tuning the absorption circuit for a frequency different from that of the input circuit, and differing from that of the oscillator circuit by the frequency of the intermediate frequency amplifier, and maintaining the above stated frequency relation of the three circuits throughout the range of the system.
  • a signal responsive system comprising an input circuit including tuning means, a filter circuit having a plurality of variable reactances, and means simultaneously to vary said tuning means and said reactances, Whereby to maintain a predetermined relationship between the frequency to which said input circuit is tuned and the frequencies to which said filter circuit is responsive.
  • a signal responsive system comprising an input circuit including tuning means, a filter circuit having a plurality of variable reactances connected to said input circuit, said filter being designed to pass only a predetermined range of electrical frequencies, and means simultaneously to vary said first mentioned tuning means and the Variable reactances.
  • a radio receiver comprising in combination, an input circuit, variable means to tune said input circuit, an absorption circuit connected t0 said input circuit, said absorption circuit comprising a plurality of variable reactances, a local oscillation generator, means variably to tune said oscillation generator, and single means simultaneously to Vary both said tuning means and. said variable reactances.
  • a radio receiver having an input circuit, means to tune said input circuit, a filter connectedto said input circuit, said filter having a variable tuning means, a local oscillation generator coupled to said filter, means to tune said local oscillation generator, and single means to vary all of said tuning means.
  • a radio receiver utilizing the beat note method of signal reception, a tuned anreactances, whereby to maintain said predetermined frequency differences for various settings of the said first mentioned tuning means.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)
US751031A 1924-11-20 1924-11-20 Electrical signaling system and signaling method Expired - Lifetime US1712036A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR243371D FR243371A (en(2012)) 1924-11-20
NL18312D NL18312C (en(2012)) 1924-11-20
US751031A US1712036A (en) 1924-11-20 1924-11-20 Electrical signaling system and signaling method
GB29246/25A GB243371A (en) 1924-11-20 1925-11-19 Improvements in or relating to wireless receivers of the heterodyne type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US751031A US1712036A (en) 1924-11-20 1924-11-20 Electrical signaling system and signaling method

Publications (1)

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US1712036A true US1712036A (en) 1929-05-07

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US751031A Expired - Lifetime US1712036A (en) 1924-11-20 1924-11-20 Electrical signaling system and signaling method

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FR (1) FR243371A (en(2012))
GB (1) GB243371A (en(2012))
NL (1) NL18312C (en(2012))

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NL18312C (en(2012))
FR243371A (en(2012))

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