US1854733A - Radio beacon - Google Patents

Radio beacon Download PDF

Info

Publication number
US1854733A
US1854733A US517827A US51782731A US1854733A US 1854733 A US1854733 A US 1854733A US 517827 A US517827 A US 517827A US 51782731 A US51782731 A US 51782731A US 1854733 A US1854733 A US 1854733A
Authority
US
United States
Prior art keywords
loop
condenser
rotating
circuits
radio
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
US517827A
Other languages
English (en)
Inventor
Bozas Guy Du Bourg De
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US1854733A publication Critical patent/US1854733A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Definitions

  • This invention relates to radio beacons, and relates more particularly to radio beacons of the typein which two or more signals of the same radio frequency modulated at diiiering audio frequencies are transmitted from a radio beacon station with differing.
  • Such radio beacon systems usually include two loops arranged at right angles to one another which transmit signals of the same wave length, the signals being differently modulated at audio frequencies. Each signal is produced by a separate radio frequency oscillator, and the audio frequency modulations are obtained by separate alternators.
  • This arrangement of the transmitting station has the disadvantage of requiring a great deal of expensive equipment and of causing difiiculty in keeping the output of the two loo s at the proper intensity.
  • each loop radiates maximum energy when it is in tune with the common oscillatory circuit and radiates little or no energy when it is out of tune therewith, it is possible to efiect the transmission from each loop (of a radio frequency signal of the desired wave length modulated at audio frequency in a manner similar to that accomplished by the use of separate alternators.
  • FIG. 2 is a wiring diagram insomewhat more detail of one form of transmitter according to my invention.
  • Figure 3 is a wiring diagram showing the application of my invention to a three loop system
  • Figure 3a is a schematic view showing the arrangement of the three loops of Figure 3;
  • Figure 4 is a diagrammatic view of a rotating condenser for use in connection with oneform of my invention
  • Figures 5 and 6 are diagrammatic'views of rotating condensers suitable for carrying out a modified form of my invention
  • Figure 7 illustrates the tuning of the circuits associated with the condensers of Figures 5 and 6;
  • Figure 8 illustrates the signals produced by the condensers of Figures 5 and 6.
  • the oscillator circuit 10 represents an oscillatory circuit tuned to the desired radio frequency at which the signals are to be transmitted. It will be under stood that this oscillatory circuit 10 maiy comprise any of the well known types 0 radio frequency oscillators, for example, a Hartley vacuum tube oscillator.
  • the oscillator circuit 10 includes an inductance 11 to whic are inductively coupled the secondary coils 12 and 13.
  • the coil 12 is connected through the condensers 14 and 16 to the rotating con- .denser 18, across which is connected the loop 20.
  • the coil 13 is similarly connected to the condensers 15 and 17, the rotating condenser 19 and the loop 21.
  • Any suitable type of rotating condenser may be employed, it being necessary only that the capacity of the condenser vary between a minimum and a maximum as the condenser is rotated.
  • a convenient type of rotating condenser will be described in detail hereinafter.
  • My invention is not to be limited to the particular location of the rotating condenser illustrated, but includes the placing of the rotating conand 19 must each be driven at a constant s cedsuch as to modulate the signals transmitted by the loops at the desired audio frequency, for example, by means of constant speed motors (not shown) suitably connected to the respective condenser shafts 22 and 23. If desired, the same motor may be used for both of the rotating condensers by employing suitable gearing. 1
  • the loops 20 and 21 will emit radio frequency waves of the frequency to which common oscillatory circuit 10 is tuned which are modulated respectively 2N and 2N times per second.
  • the signals so transmitted may be picked up by an airplane in the vicinity of the transmitting station and utilized to guide the pilot. in determining the course of the plane.
  • the receiving set will be tuned to the radio frequency of the oscillatory circuit 10' and will be provided with vibrating reeds, one of which will be responsive to. the audio frequency modulation 2N and the other to the modulation 2N, which may be, respectively, 65 and 86.7 cycles.
  • Figure 2 in its essentials is similar to Figure 1, but shows the circuit connections of a particular form of vacuum tube oscillator, and in addition shows the energization of the oscillator by a source of alternating potential.
  • the loop circuits are the same as those shown in Figure 1, and consequently like reference characters are employed to indicate like parts and no detailed description thereof is necessary.
  • the main oscillatory circuit from which the loops derive their' power includes a vacuum tube 25 havin the usual filament, grid and plate.
  • the lament is heated by'current obtained from the secondary of transformer 26, the primary of which derives its power from an alternator 27.
  • the grid and plate circuits contain inductanccs 28 and 29 respectively,
  • Figure 3 is similar in principle to Figure 1, but shows the application of my invention to aradio beacon system comprising three transmitting loops, 31, 32 and 33. The position of the loops in plan view with respect to one another is shown in Figure 3a.
  • the rotating condensers may be constructed as shown. in Figure 4, in which figure the rotating condenser 40 is provided with two sets of stator plates 41 and 42 insulated from one. another. 43 /and 44 representtwo sets of rotor plates, which are connected together through the shaft 45.
  • the rotating condenser 40 In using a rotating condenser of this type in the circuits shown in Figures 1, 2 and 3, one set of stator plates will be connected to each terminal of the associated loop, and the rotor plates will,
  • Figures and 6 illustrate shapes of condenser plates which aresuitable for the rotating condensers to be employed in such aural beacon systems.
  • the rotating condensers be so designed and operated that one loop arrives in tune at the instant when the other loop commences to get out of tune with the main oscillatory circuit.
  • the two loops will send out complementary signals.
  • one loop send out dashes and the other loop complementary dots so that a pilot guiding himself by the beacon will hear a continuous signal when he is on the course and dots or dashes when he is oil the course on one side 'or the other as the case may be.
  • the condenser 50 comprises two insu ated sets of stator plates 51 and 52,
  • each set of plates subtends an angle of It follows, therefore, that during each 360 rotation of the rotor plates 53 and 54, the capacity of the condenser will be at or near its minimum durin two equally spaced 120 %the rotor plates.
  • each of the loop circuits 20 and 21 may be tuned so that a maximum signal is transmitted when the rotating condenser is at minimum capacity, that is, the inductances and capacities of the loop circuits may be so chosen or adjusted that each loop is in resonance with the oscillatory circuit 10 when the rotating condenser associated therewith is in its minimum capacity position.
  • a radio beacon system a plurality of transmitting loop circuits relatively angularlylocated, meansfor energizing said loop circuits at a radio frequency, and a rotating condenser in each of said loop circuits for tuning and detuning said loop circuits to said radio frequency periodically at different audio frequencies.
  • a radio beacon system a plurality of transmitting loop circuits relatively angular- 1y located, an oscillatory circuit coupled thereto for energizing said loop circuits at a radio frequency from a common source, and a rotating condenser in each of said loop circuits, said condensers being arranged to rotate at different constant speeds for tuning and detuning said loop ,circuits periodically at different audio frequencies.
  • a radio beacon system a plurality of transmitting loop circuits relatively angularly located, a vacuum tube oscillator coupled thereto for energizing said loop circuits at a radio frequency from a common source, an
  • alternatin current source for the plate currentof said oscillator, said alternating current source having a musical frequency, and a rotating condenser in each of said loop circuits for alternately tuning and detuning said loop circuits to said radio frequency periodiaudio frequencies, said rotating condensers being adapted to tune and detune said loop circuits alternately, whereby complementary signals are .transmitted.
  • a pair of transmitting loop circuits relatively angularly located, an oscillatory circuit coupled thereto for energizing said loop circuits at a radio frequency from a common source, and a rotating condenser in each of said loop circuits for tuning and detuning said loop circuits to.
  • said radio frequency periodically at difierent audio frequencies, said rotating condenseis 5 being adapted to tune and detune said loop circuits alternately, whereby complementary signals are transmitted.
  • a radio beacon system a plurality of transmitting loop circuits relatively angular-- 0 1y located, common means for supplying oscillating energy to both said circuits, means for tuning and detuning said circuitscomprisingcontinuously rotating condensers for the respective circuits arranged for relative al- 5 'tering the radiation of energy-fromthe loops circuits.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Selective Calling Equipment (AREA)
  • Burglar Alarm Systems (AREA)
US517827A 1930-10-18 1931-02-24 Radio beacon Expired - Lifetime US1854733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR592439X 1930-10-18

Publications (1)

Publication Number Publication Date
US1854733A true US1854733A (en) 1932-04-19

Family

ID=8964829

Family Applications (1)

Application Number Title Priority Date Filing Date
US517827A Expired - Lifetime US1854733A (en) 1930-10-18 1931-02-24 Radio beacon

Country Status (4)

Country Link
US (1) US1854733A (fr)
DE (1) DE592439C (fr)
FR (3) FR686863A (fr)
GB (1) GB363561A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484786A (en) * 1965-06-02 1969-12-16 Montages Electr Atel Modulated wave mechanical generator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754630C (de) * 1934-01-27 1953-06-08 Marconi Wireless Telegraph Co Einrichtung zur abwechselnden Freigabe und Sperrung der Energieuebertragung auf einer Hochfrequenzleitung
DE879717C (de) * 1940-01-04 1953-06-15 Aga Baltic Aktiebolag Vorrichtung zur periodischen Antennenumschaltung bei Funkfeuern fuer Feldstaerkevergleich
NL59218C (fr) * 1940-01-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484786A (en) * 1965-06-02 1969-12-16 Montages Electr Atel Modulated wave mechanical generator

Also Published As

Publication number Publication date
FR38510E (fr) 1931-06-13
FR40280E (fr) 1932-06-08
DE592439C (de) 1934-02-10
GB363561A (en) 1931-12-24
FR686863A (fr) 1930-07-31

Similar Documents

Publication Publication Date Title
US2252699A (en) Azimuth radio beacon system
US2279151A (en) Panoramic radio receiving system
US2451430A (en) Carrier frequency shift signaling
US1691338A (en) Aerial system
US2157122A (en) Warning system for indicating the proximity of aircraft
US1854733A (en) Radio beacon
US2129004A (en) Radio signaling
US1934924A (en) Radio communication system
US1814813A (en) Radio signaling system
US1994514A (en) Frequency control system
US1708518A (en) Communication system
US2241918A (en) Directional radio transmitter
US2593485A (en) Localizer beacon system
US2321456A (en) Short-wave keying device
US1463994A (en) System for the transmission and reception of radiant energy
US1961206A (en) Twelve-course, aural type, triple modulation directive radiobeacon
US1394560A (en) Apparatus for transmitting radiant energy
US2255741A (en) System for determining navigatory direction
US2027529A (en) Navigational guide system
GB385521A (en) Improvements in or relating to radio direction finding apparatus
US1690579A (en) System for the production of and detection of compressional waves
US1974545A (en) Wireless transmission system
US2036187A (en) Radio receiving system
US1694654A (en) Method of and system for electrical signaling
US1884707A (en) Beacon system