US2159081A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2159081A
US2159081A US110864A US11086436A US2159081A US 2159081 A US2159081 A US 2159081A US 110864 A US110864 A US 110864A US 11086436 A US11086436 A US 11086436A US 2159081 A US2159081 A US 2159081A
Authority
US
United States
Prior art keywords
signal
relay
current
circuit
grid
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
US110864A
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English (en)
Inventor
Otho D Grandstaff
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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
Priority to BE424612D priority Critical patent/BE424612A/xx
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US110864A priority patent/US2159081A/en
Priority to GB26971/37A priority patent/GB503497A/en
Application granted granted Critical
Publication of US2159081A publication Critical patent/US2159081A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current

Definitions

  • the tone unit disclosed herein is a direct improvement on the tone unit illustrated in Fig. 4 v of the drawings in Patent 2,040,637, granted May 12, 1936 to John Wicks.
  • the improved tone unit may be used to replace the tone unit shown in Fig. 4 of the Wicks patent, as the leads incoming 20 to the tone unit disclosed herein are similar in function and number to the leads interconnecting the tone unit in the Wicks patent with the associated repeater.
  • the new tone unit was provided particularly for cooperation 25 with new and improved impulse repeaters of the type shown in the application of John Wicks, Serial Number 109,671, filed November 9, 1936.
  • the present tone unit. is fully illustrated and is rather completely de- 30 scribed in order to bring out the novel features ofthe system disclosed in the said Wicks application.
  • the signals received over the associated toll line come into the tone unit through receiving conductors H62 of the cable
  • 204 is controlled over pulsecut-in lead H66 of the cable 200 to substitute incoming-impulse relay
  • 200 correspond to receiving leads 391 and 392
  • 6I correspond to sending leads 393 and 394 of the Wicks patent
  • and modulation-cut-oif conductor H61 correspond respectively to relay 324 and lead 395;
  • 202 and the associated Vcable conductor H65 correspond respectively to relay 325 and conductor 396 in the Wicks patent; pulse-cut-in relay
  • 204 and the associated cable conductor H66 correspond respectively to relay 401 and the associated lead in the Wicks patent; and the signal-in and dial-in leads H63 and
  • I64 correspond respectively to the leads in the said Wicks patent which are controlled by relays 404 and 402, respectively.
  • the tone unit includes vacuum tubes I2I I, I2I2,
  • 3 are of the type known as 6C6, each being provided with a heater of a nominal rating of 6.3 volts, at which voltage it draws .3 ampere.
  • 2 is a double-diode tube arranged to function as a differential detector of incoming signals. 'Ihis tube is of the type known as 6H6, being provided with a two-section heating which requires a potential difference of 6.3 volts to pass .3 ampere throughit.
  • the suppressor grid (used as a modulation grid) which is connected either to ground potential or to the (iO-cycle, 40-volt lead I24I, depending upon the actuated or restored condition of relays I20I and
  • are arranged to form what may be termed a double-peak tuner.
  • This tuner peaks atv 900 cycles and at 1100 cycles. 'I'he 900- and 1100-cycle peaks are in addition to the peak produced by the inductance coil
  • in series with the tuning condenser
  • the last named condenser has a capacity oi' about .01 mf. Current of 1100 cycles is substantially prevented from flowing through condenser
  • (resonant at 900 cycles at 1100 cycles) is connected to the heater circuit at a point of negative 1.2 volts potential, whereby the plate connected to coil
  • 204 is provided to be controlled over pulse-cut-in conductor H06.
  • 204 is operated to substitute incoming-impulse relay
  • 34 is sufficient to block the flow of current from the volt source of plate current.
  • a signal is received which causes the potential on the control grid of tube
  • 203 operates when about 4.5 milliamperes of current are flowing in the plate circuit, about 9 milliamperes being preferable for operating the relay reliably during the reception of dial pulses.
  • 4 is provided to amplify the 60-cycle modulations received at the plate of impulse amplier
  • 4 is provided with a normal ⁇ negative biasing potential of 20.1 volts through the 100,000-ohm grid resistor
  • serves to couple the plate of tube
  • the signal impulses pass to the incoming-signal relay
  • 205 are so chosen that the circuit containing them ⁇ is series resonant at about 60 cycles, whereby the incoming signal responds vigorously to 60-cycle current, but does not respond when the 1000-cycle dial impulses, following each other at about ten to fourteen impulses per second, are received.
  • 235 is provided to bypass amplified, half-wave-rectified 1000-cycle carrier current from relay
  • 204j is in 'restored condition, whereby incoming impulse relay
  • This pulse comes intothe tone unit through the receiving conductors
  • the signal is .amplified and passes through condenser
  • incoming-impulse relay 203 is removed from circuit and plate-impedance coil
  • 202 is restored to transfer the grid of the tube'
  • a 1000-cycle variation is caused to beproduced in the plate current normally passing through plate impedance coil
  • the grid lying just within the plate or anode element of the tube, is extended through contacts of the non-operated relay
  • 202 may be permitted to reoperate to return the tone to the normally existing receiving condition.
  • may be operated over modulation cut-oil.' conductor H61 to thereby connect the associated back contact of the concerned armature of relay
  • 202 is next restored unmodulated 1000-cycle current ows from the tube
  • This 1000- cycle current is suitably impressed through pulsing contacts of the impulse repeater on the conductors of the toll line.
  • may be again restored after the dial pulses have been transmitted to permit the transmission of further 60-cycle-modulated, 100G-cycle current, the varying control of the relay
  • 231 may be restored for this purpose. Additional contacts of key
  • 234 may be actuated and a test plug associated with the test equipment may be inserted into the jack
  • 202 is restored and modulatlon-cut-off relay
  • the transmission level is not satisfactory, it may be adjusted by moving the slide arm of the adjustable shunt resistor
  • the plug When the test and adjustment have been accomplished, the plug may be removed from the jack I2
  • 202 is permitted to reoperate and relay
  • connection between thecontrol grid of tube i 'further' reduces the inter-contact capacity which may otherwise be sufficient to impress a slight local 1000-cycle modulation on the control grid with relay
  • a responding relay arranged to respond to impulses of rectified carrier current to repeat corresponding signal pulses into a local circuit, a circuit resonant at the modulation frequency of the received carrier current, a ⁇ signal relay responsive tothe flow of resonant current in said resonant circuit, an amplifying device'for ⁇ supplying power to said resonant circuit, and cir- 2.
  • a source of alternating current signals a conductor on which said signals are to be impressed, a first rectifier associated with said source for impressing rectified signal potentials on said conductor, a second rectifier interconnected with said conductor and effective to draw curr-ent from said conductor to reduce the potential thereon, means for impressing a biasing potential opposing the drawing of current from said conductor except when the rectified potential thereon is sufficient to overcome the biasing potential, a responding device, and means for causing said device to respond to signals according to the potential existing on said conductor.
  • an electron discharge device including input and output electrodes, an output circuit coupled to said output electrodes,
  • va tuned circuit having a frequency response characteristic which peaks at a predetermined frequency, a tuned circuit having a frequency response characteristic which peaks at frequencies respectively above and below said predetermined frequency, said tuned circuits being adapted to be coupled to a source of signal currents, means for impressing a direct voltage between said input electrodes which is controlled in accordance with the signal voltage across one of said tuned circuits, and means for impressing a direct voltage between said input electrodes which is controlled in accordance with the signal voltage across the other of said tuned circuits and which is in opposition to said firstnamed direct voltage, whereby the current in said output circuit is controlled in accordance with the difference in magnitudes of the signal voltages across said tuned circuits.
  • an electron discharge device including input and output electrodes, a tuned circuit having a response characteristic which peaks at a predetermined frequency, a tuned circuit having a response characteristic which peaks at frequencies substantially equally spaced respectively above and below said predetermined frequency, the peak frequencies of said last-named tuned circuit being displaced substantially equally on either side of said predetermined frequency, means for impressing a direct voltage between said input electrodes which is controlled in accordance with the signal voltage across one of said tuned circuits, and means for impressing a dir ect voltage between said input electrodes which is controlled in accordance with the signal voltage across the other of said tuned circuits and which is in opposition to said firstnamed direct voltage, whereby the current in said output circuit is controlled in accordance with the difference in magnitudes of the signal voltages across said tuned circuits.
  • an electron discharge device including input and output electrodes, an output circuit coupled to said output electrodes, a tuned circuit having a frequency response characteristic which peaks at a predetermined frequency, a tuned circuit having a frequency response characteristic which peaks at frequencies respectively above and below said predetermined frequency, said tuned circuits being adapted to be coupled to a source of signal currents, and a network including rectifying means interconnecting said tuned circuits and said input electrodes, said network being so connected and arranged that a direct voltage, variable in accordance with the signal voltage across said iirstnamed tuned circuit, is impressed on said input electrodes, and a second direct voltage, opposed to said first direct voltage and variable in accordance with the voltage across said secondnamed tuned circuit,is impressed on said input electrodes, whereby the current in said output circuit is controlled in accordance with the difference in magnitudes of the signal voltages across said tuned circuits.
  • an electron discharge device including input and output electrodes, an output circuit coupled to said output electrodes, a tuned circuit having a frequency response characteristic which peaks at a .predetermined frequency, a tuned circuit having a frequency response characteristicv which peaks at frequencies respectively above and below said predetermined frequency, said tuned circuits being adapted to be coupled to a source of signal currents, means normally biasing said device beyond cut off, means for impressing a direct voltage between said input electrodes which varies in accordance with the signal voltage across said first-named tuned circuit, whereby a current in said output circuit is only produced when the signal voltage across said first-named tuned circuit attains a substantial value, and means for impressing a,
  • an electron discharge device including input and output electrodes, an output circuit coupled to said output electrodes, a biasing network connected between said input electrodes, a tuned circuit having a frequency response characteristic which peaks at a predetermined frequency, a tuned circuit having a frequency response characteristic which peaks at frequencies respectively above and below said predetermined frequency, said tuned circuits being adapted to be coupled to a source of signal currents, a rectifier coupled to said first-named tuned circuit and connected to impress its rectified output lvoltage across at least a portion of said biasing network, and a second rectifier coupled to said second-named tuned circuitl and connected to impress its rectified output voltage across at least a portion of said biasing network in opposition to said first-named rectified voltage, whereby the current in said output circuit is controlled in accordance with the difference in magnitudes of the signal voltages across said tuned circuits.
  • an .'electron discharge device including input and output electrodes, an output circuit coupled to said output electrodes, Aa biasing network connected between said input electrodes, a tuned circuit having a frequency response characteristic which peaks at la predetermined frequency, a tuned circuit having a .frequency response characteristic which peaks at frequencies respectively above and below said predetermined frequency, said tuned circuits being adapted to be ycoupled to a source of signal currents, a source of biasing voltage connected to said.biasing network and normally effective to bias said-device beyond cut off, a rectifier coupled to said first-named tuned circuit and connected to impress its rectied output voltage across at least a portion of saidnetwork in opposition to said biasing voltage, and a second rectifier coupled to said second-named tuned circuit'and connected to imp ress its rectified output voltage across at least a portion of said network in the correct phase to boost said biasing voltage, whereby a current in said output circuit is only produced when the signal voltage across said first-named tuned circuit attains a substantial value
  • a signal receiving device comprising, in combination, an inductance element, means comprising a capacitor for tuning said element to resonance at a predetermined frequency, means comprising a second capacitor for ⁇ tuning said element to resonance at a second frequency, and means comprising a circuit resonant at said predetermined frequency for preventing said second-named capacitor from substantially affecting the response of said device at said predetermined frequency.
  • a signal receiving device comprising, in combination, an inductance element, a capacitor connected in series with said inductance element to tune said element to resonance at a predetermined frequency, a second .capacitor connected in series with said element to tune said element to resonance at a second frequency which is substantially lower than said predetermined frequency, and means comprising a parallel resonant circuit tuned to said predetermined frequency and connected between said inductance element and said second-named capacitor for preventing said second-named capacitor from substantially affecting the response of said device at said predetermined frequency.
  • a signal receiving device having input terminals and comprising, in combination, a pair of reactance elements having opposite frequencycurrent characteristics connected in series between said terminals, said elements having their reactance values so proportioned that the circuit formed thereby is resonant at a predeter- ⁇ mined frequency, and a network shunting one of said elements, said network comprising a reactance element of the same type as said one element and a parallel resonant circuit connected in series, the reactance valu of the elements of said network being so proportioned relative to each other that the series impedance thereof is substantially innlteat said predetermined frequency and that the combined circuit formed by the other of said pair of elements and said network is resonant at a second frequency different from said predetermined frequency.
  • a signal receiving device having input ter- Y minals and comprising, in combination, a pair of reactance elements having opposite frequencycurrent characteristics connected in series between said terminals, said elements having their i'eactance values so proportioned that the circuit formed thereby is resonant at a predetermined frequency, a network shunting one of said elements, said network comprising a reactance element of the same type as said one element and a parallel resonant circuit connected in series, the reactance values of the elements of said network being so proportioned relative to each other that the series impedance thereof is substantially innite at said predetermined frequency and that the combined circuit formed by the other of said pair of elements and said network is resonant at a second frequency different from said predetermined frequency, and a second circuit connected between said terminals, said second circuit comprising a pair of reactance elements having opposite frequency-current characteristics connected in series and having their reactance values so proportioned that said second circuit is resonant at a frequency substantially intermediate said predetermined frequency and said second frequency.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
US110864A 1936-11-14 1936-11-14 Telephone system Expired - Lifetime US2159081A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE424612D BE424612A (en:Method) 1936-11-14
US110864A US2159081A (en) 1936-11-14 1936-11-14 Telephone system
GB26971/37A GB503497A (en) 1936-11-14 1937-10-05 Improvements in or relating to electrical signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US110864A US2159081A (en) 1936-11-14 1936-11-14 Telephone system

Publications (1)

Publication Number Publication Date
US2159081A true US2159081A (en) 1939-05-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US110864A Expired - Lifetime US2159081A (en) 1936-11-14 1936-11-14 Telephone system

Country Status (3)

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US (1) US2159081A (en:Method)
BE (1) BE424612A (en:Method)
GB (1) GB503497A (en:Method)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482478A (en) * 1947-03-29 1949-09-20 Automatic Elect Lab Tone unit
US2589113A (en) * 1949-11-22 1952-03-11 Automatic Elect Lab Frequency modulated tone units

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2482478A (en) * 1947-03-29 1949-09-20 Automatic Elect Lab Tone unit
US2589113A (en) * 1949-11-22 1952-03-11 Automatic Elect Lab Frequency modulated tone units

Also Published As

Publication number Publication date
GB503497A (en) 1939-04-05
BE424612A (en:Method)

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