US1449722A - High-frequency signaling system - Google Patents

High-frequency signaling system Download PDF

Info

Publication number
US1449722A
US1449722A US1449722DA US1449722A US 1449722 A US1449722 A US 1449722A US 1449722D A US1449722D A US 1449722DA US 1449722 A US1449722 A US 1449722A
Authority
US
United States
Prior art keywords
tubes
high frequency
circuit
tube
transmitting
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
Other languages
English (en)
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.)
Publication date
Application granted granted Critical
Publication of US1449722A publication Critical patent/US1449722A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal

Definitions

  • My present invention relates to high frequency signaling systems and more particularly to apparatus of the vacuum tube type for producing and modulating high frequency oscillations for use in a signaling system.
  • the transmitting equipment comprises a series of vacuum tubes 1, 2, 3, 1, 5 of the three-electrode or pliotron type.
  • 1 and 2 are designated as oscillators, tubes 3 and 4 as modulators, and tube 5 as an amplifier.
  • the filaments in all of these tubes are connected to common bus bars 6 and 7 which are supplied with current for lighting the filaments from the secondary 8 of an alternating current transformer 9, the middle point 10 of the sec Serial No. 501,334.
  • the input circuit of the oscillator tubes 1 and 2 comprises a series condenser 11 shunted by the leak resistance 12 and a second series condenser 13 which is shunted by a rotatable make and break device 14: in series with a key 15.
  • the input circuit is completed to the filament by means of the ground connection at 16 and ground connection 17 to the middle point of the transformer secondary 8.
  • the output circuits of the oscillators 1 and 2 are supplied with energy from a direct current source 18 through an audio frequency reactance 19 and an inductance 20, the
  • the transmitting circuit to which high frequency oscillations are to be supplied in the case illustrated includes an antenna 22 which may be connected by means of the switch 23 either to the transmitting equipment by making contact at 24, or to suitable receiving equipment by contact 25.
  • the connection between antenna and earth may be made through the variable connector 26 to a series of condensers 27, loading inductances 28, the variable loading inductance 29 and inductance 30, which is coupled to the plate inductance 20.
  • the necessary coupling between the output circuits of the tubes 1 and 2 and their input circuits to permit these tubes to act as generators of high frequency oscillations is obtained by means of the capacity 31.
  • the amount of coupling capacity which is most suitable for the different wave lengths to be generated may be obtained by means of the variable connector 32.
  • the output circuits of the modulators 3 and 4 are supplied with energy from the source 18 through the iron core impedance 19 and the radio frequency choke 33.
  • the sound waves which are to be transmitted for reproduction at the receiving station are impressed upon the telephone transmitter 34 which is in a local circuit with the battery 35 and primary 36 of a telephone transformer.
  • the output circuit of the amplifier 5 is supplied with current from a direct cur-- rent source 38 through an impedance 39.
  • the amplitude of the high frequency oscillations generated varies in direct accordance With the variations in the current supplied by the microphone 34.
  • the condenser 13 is short circuited by a closure of thekey 15 and by contact made through the rotatable make and break device 14 or in any other desired manner.
  • the grids and anodes of the modulators 3 and 4 may be connected by means of switches 41 and 42,. respectively in parallel with the'grids and anodes of oscillators l and 2.
  • the numberof oscillating tubes being thus doubled the output of the equipment will also be substantially doubled.
  • the amplifier- 5 may also by suitable connection be employed in parallel with the other tubes as: an oscillator.
  • the average potential of the grids should be negative.
  • the grid condenser 11 with the grid leak resistance 12 furnishes the necessary adjustmenttor this such a high negative charge that the pro purpose and when the modulator tubes are switched over in parallel with the oscillator tubes the value oi? this resistance maybe ad justed by means oi the variable connection 43 to give the desired negative potential for the operation oi the four tubes in parallel.
  • the device '14 When it is desired to transmit interrupted continuous waves the device '14 is rotated. WVhen the shunt circuit around condenser 13 is broken by means of this device the grids of the tubes immediately assume duction of high frequency oscillations is stopped. When this shunt circuit is made the negative charge on the grids is permitted to leak off through the leak resistance 12 and the connection around condenser 13 and the production of oscillations immediately starts.
  • the device 14 If the device 14 is rotated at such a speed as to produce interruptions at an audible fre quency, then when the key 15 is closed high frequency oscillations will be supplied to the antenna in groups succeeding each other at an audible frequency. W hen it is desired to transmit continuous waves the make and break device 14 is short circuited or stopped at such a point that ,contact is made therethrough and the generation othigh frequency waves is interrupted only when the key 15 is opened. A choke coil 44 should be inserted in series with the make and break device 14 and the key 15 to prevent high frequency current from flowing in this shunt circuit.
  • a trap circuit may be formed by shunting this choke with a condenser 61. This trap circuit is tuned to the transmitting wave length.
  • a biasing battery. 45 may be employed.
  • This same battery may also, if desired, be employed for furnishing a biasing potential for the grids of the oscillators by means of the connection 59. thatthe equipment may be operated to supply dii'l'erent amountsof power, theresistance 46 may be inserted in series with the field 4'7 of the generator 18 by means of a switch 48.
  • the amount of this resistance in the field of the generator may be varied as desired; andthe amount of power supplied from the generator to the oscillating system thereby varied at will.
  • the potential of the grids of the tubes should be varied. This may be accomplished by means of the s vitch 49, whiclrmay be operated simultaneously with the switch 48.
  • the current supplied to the filaments is com- .to the filaments and plate circuits and the time ,when oscillations start.
  • means may be provided whereby the current supplied to the filaments of the vacuum tubes will be reduced to such a value .during the reception period that the life of the tubes will be greatly increased over their life in case the filament current should be kept. at its normal value during reception. If the filament current is restored to its normal value as soon as it is desired to transmit, oscillations will start sooner than they would if the filament current and the consequent heating of the filament had to
  • the conductors 55 and 56 form a short circuit around the resistance 53 so that this resistance is automatically short circuited when the transmitting equipment is connected to the antenna.
  • the apparatus should preferably be so arranged and switching means provided whereby all of the adjustments of the system for changing the wave length transmitted may be made simultaneously by the operation of one switch handle.
  • These adjustments in the system illustrated comprise the variable connections 26 and 82 and also preferably the variable connection 60 to the plate inductance 20.
  • An auX- This difiiculty may telephone transmitter 34 may be replaced by an interrupter such as the interrupter 14 or a buzzer. If, for example, a buzzer is employed in place of the microphone 34 then when the tubes 1 and 2 are employed as '05- cillators, tubes 3 and 4 will act as modulators and tube 5 as an amplifier.
  • the keying of the system may then be accomplished either by means of the key 15 in shunt to condenser 13, or by insertlng a key in the primary circuit of the microphone transformer.
  • the first method of operation mentioned is preferable, but has one disadvantage in that plate current will be taken by tubes 3, 4 and 5 whether the key 15 is up or down.
  • the positive terminal of the biasing battery 45 instead of being connected directly to ground, as shown, may be connected through the connection 59 to ground through the condenser 13, the negative terminal of the battery 45 being connected to the grids of tubes 3, 4 and 5 by means of the switch 49. These grids will then when the key 15 is open, receive a negative potential suiticient to cut off the plate current.
  • a high frequency transmitting apparatus of .a plurality of vacuum tubes having input and output circuits, the input circuit of at least one of said tubes being coupled by capacity to the output circuit wherebythe tube will act as a high frequency oscillation generator, means whereby one of said tubes will act as a modulator of the high frequency oscillations generated and means whereby the modulator transmitting system of a transmitting circuit, a plurality of vacuum tubes adapted to act as oscillation generators and modulators for generating'and modulating high frequency oscillations and supplying them to the transmitting circuit and means wherei by the modulator tubes may be connected in parallel with the oscillator tubes to assist in the generation of high frequency oscillations.
  • he combination in a high frequency transmitting system of a transmittin circuit means for varying the tuning of said transmitting circuit, a plurality of vacuum tubes having input and output circuits,-the output circuit of at least one of said tubes being coupled to the transmitting circuit and the input circuit of said tube being coupled by capacity to the transmitting circuit whereby the tube will act as a generator of high frequency oscillations which will be supplied to the: transmitting circuit, means for varying the amount of capacity coupling, means whereby another of said tubes willact as a modulator of the high frequency oscillations supplied to the transmitting circuit and means whereby the modulator tube circuits may also be connected in parallel with the oscillator tube circuits and thereby assist in the generation of high frequencly oscillations.
  • a plurality of vacuum tubes adapted to act as oscillation generators and modulators for generating and modulating high frequency oscillations and supplying them to the transmitting circuit, means whereby the modulator tubes may be connected in parallel with the oscillator tubes to assist in the generation of high frequency oscillations, and means for-interrupting in a regular and predetermined manner the generation of oscillationsvwhen all of the tubes are employed as oscillators.
  • the oscillator tube circuits and thereby assist in the generation of high frequency oscillations, and means for interrupting in a regular and predetermined'manner the generation of oscillations when all of the tubes are employed as oscillators.
  • tion generator means whereby at least one ofsaid tubes will act as a modulator.
  • of the high frequencyoscillations generated means whereby the input circuit of the modulator tube may be connected in parallel with the input circuit of the oscillator tube, a common portion of all of the input circuits thus:
  • a radio signaling system of an antenna a vacuum tube trans mitting set adapted to supply high frequency oscillations .to said antenna, a source of current for supplying heating current to the filaments of the vacuum tubes of said transmitting set, a resistance in series with said source, switching means for connecting said antenna to said transmitting set or to a receiving set, and means adapted to be operated simultaneously with said switching means for short circuiting said resistance when the antenna is connected to the transmitting set and removing the short circuit from said resistance when the antenna is connected to the receiving set.

Landscapes

  • Amplifiers (AREA)
US1449722D 1921-09-17 High-frequency signaling system Expired - Lifetime US1449722A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US558246XA 1921-09-17 1921-09-17

Publications (1)

Publication Number Publication Date
US1449722A true US1449722A (en) 1923-03-27

Family

ID=22000388

Family Applications (1)

Application Number Title Priority Date Filing Date
US1449722D Expired - Lifetime US1449722A (en) 1921-09-17 High-frequency signaling system

Country Status (2)

Country Link
US (1) US1449722A (fr)
FR (1) FR558246A (fr)

Also Published As

Publication number Publication date
FR558246A (fr) 1923-08-23

Similar Documents

Publication Publication Date Title
US2462181A (en) Radio transmitting system
US2455472A (en) Method and system for electronically generating complex signals
US1449722A (en) High-frequency signaling system
US2347826A (en) High frequency switching means
US1790486A (en) Broadcasting system
US1953140A (en) Radio transmitting system
US1895111A (en) Signaling system
US1872364A (en) Radiotransmitting system
US1687933A (en) Electrical signaling system
US1985924A (en) Transmitter
US1612285A (en) System of secret radiant telephony
US1768418A (en) Space discharge system
US1687896A (en) Radio transmitting system
US1564224A (en) Modulating apparatus for telegraph signals
US1396786A (en) System for transmission of intelligence
US1857819A (en) Radio telephone system
US2440622A (en) Modulation
US2018401A (en) Wave transmission and modulation
US1700580A (en) Radio frequency communication system
US1854457A (en) Electric wave signaling system
US1599586A (en) Radiant signaling system
US1724917A (en) Signaling
US1455099A (en) High-frequency signaling system
US1612284A (en) Secret radiant telephone
US1696595A (en) High-frequency duplex signaling system