US2429634A - Four course beacon - Google Patents

Four course beacon Download PDF

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Publication number
US2429634A
US2429634A US490594A US49059443A US2429634A US 2429634 A US2429634 A US 2429634A US 490594 A US490594 A US 490594A US 49059443 A US49059443 A US 49059443A US 2429634 A US2429634 A US 2429634A
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US
United States
Prior art keywords
energy
line
source
radio frequency
signals
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
US490594A
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English (en)
Inventor
Frank J Lundberg
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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 FR961093D priority Critical patent/FR961093A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US490594A priority patent/US2429634A/en
Priority to GB5512/45A priority patent/GB604920A/en
Application granted granted Critical
Publication of US2429634A publication Critical patent/US2429634A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 signal systems; and more particularly to systems wherein energy ⁇ may be difierently modulated in two independ-' ent channels and supplied from a common source to a desired load in predetermined phase relationship.
  • a radio beacon of this character is illustrated in the copending application of A. Alford and N. Marchand, Serial No. 449,258, filed July 1, 1942, now Patent No. 2,414,431, issued January 21, 1947.
  • the line feeding energy to the course-identifying arrangement will have radio frequency energy therein with a given percentage modulation.
  • any tampering with the radio frequency source at a point in advance of the coupling point to the second modulator will cause an upset in the predetermined phase relationship requiring further ad- J'ustment.
  • antenna elements I, 2 and 3 horizontally disposed in substantially a straight line, elements I and 3 being interconnected by transmission line 4 provided with a transposition 5 and substantially equally spaced from central antenna 2.
  • the other two units 1 and 9 are shown substantially equally spaced on either side of antenna 2 and interconnected by a transmission line 8 provided with a transposition in.
  • the antenna units are horizontal loops of the type more fully described in U. S. Patent No. 2,283,897, issued May "26, 1942. It should be understood, however, that any type of antenna suitable for providing beacons may be used if. desired.
  • Line 29 is connected to one terminal of bridge 28 to extract therefrom substantially only side band modulated energy which is applied over line 4 and transposition 5 to antenna elements I and 3.
  • From the diagonally opposite terminal of bridge 28 is connected line 30 which applies energy over bridge 40 and line 42 to antenna element 2.
  • Coupling 20 is preferably a relatively close coupling to furnish substantial power to antennas I, 2 and 3 since there is not amplification beyond this point.
  • Other energy modulated in electronic modulators 52, 53 is supplied to the antenna array comprising antennas I, 9 and 2 to define a course at right angles to that defined by I, 2 and 3.
  • Serial No. 449,258, referred to above a similar arrangement is illustrated. However, in the arrangement of that application, energy from the common source is fed from difierent points therein to the separate mod- .in bridge such as (iii.
  • the energy applied at it! is-fed to two grids 54a of the tube of modulator amplifier 52.
  • Thistube is preferably biased so that the energy supplied will drive the tube to saturation. By operating substantially at saturation, the unwanted modulations present on energy supplied from line 2
  • Voice frequency signals are applied from source i to the input of both modulators 52 and 53.
  • a course indicating frequency of, for example, 1020 cycles may be supplied to one of the modulators such as 52.
  • These modulating signals are applied to the plates 5 of modulator 52 so as to produce plate modulation of the energy therein.
  • To the corresponding plates of modulator 53' only the voice signals are applied for the reasons set forth later; Modulated radio frequency istaken from the output of modulators 52 and 53 over lines 55 and 56 and applied to diagonally opposite terminals of a bridge network 51.
  • r 1 In a radio signaling system comprising a source of. radio frequency energy, a coupling line 2 for supplying said radio frequency energy to a load, means for modulating said energy with a first signal whereby modulation of said first signal exists in said coupling line, an electronic The side band energy at voice frequency is such that it as well as the carrier frequency is balanced out modulating means for modulating said radio frequency energy with a second signal independently of said first signal, and means for supplying energy modulated with said. first signal and energy with said second signal toloads in a predetermined phase relation; a combination for maintaining said.
  • said electronic modulator comprises a vacuumtube amplifier having a grid, an anode, a grid circuit, means'for applying said radio frequency energy to said. grid circuit, an anode circuit and means for applying said second signals tosaid'anode circuit to plate modulate the energy applied to said grids.
  • means for supplying different modulations on a carrier from a single source comprising first a source of radio frequency energy, a carrier output line coupled to said source, a four terminal bridge network having one terminal coupled to said carrier output line, a balancing network coupled to the diagonally opposite terminal of said bridge, signal output lines coupled to the other diagonally disposed termi-nals ofsaid bridge, first modulating means in each'of .said signal output lines, whereby certain percentage of modulation exists in said carrier output line, electronic modulator means, means loosely coupled to said carrier outputlin'e for supplying radio frequency energy to.
  • said electronic modulator means said electronicxmodulator means having such bias that'said radio frequency energy operates said modulator means at saturation, whereby modulation effects from'said first modulating means is. substantially elimi- 'nated second signal means, andmeans for applying energy from said second signal means to said electronic modulator means to modulate the radio frequency supplied thereto.
  • a radio beacon including a source of radio frequency energy, an antenna array comprising outer antenna elements and a central antenna element, first means for supplying energy from said source to said antenna elements to provide a course indicating signal, second means for supplying energy from said radio frequency source to said central antenna unit in predetermined phase With respect to energy from said first means, means for modulating energy in said first means With course identification signals, and electronic modulator means for modulating energy in said second means to provide other typesof signals, circuit connections for maintaining said predetermined phase relation comprising a coupling line from said source to said first modulator whereby said radio frequengy energy carrying a percentage modulation of saga course identification signals are present in saifigi line, coupling means for coupling said couplin line to said electronic modulator means to caus substantial saturation of said electronic modu l l l lator means to substantially eliminate said course identification modulation, a source of said other types of signals, and means for coupling said source of signals to said electronic modulator to modulate said radio frequency energy with said other types of signals
  • a radio beacon according to claim 4 wherein said electronic modulator comprises a vacuum tube amplifier having a grid, an anode, a grid circuit, means for applying said radio frequency energy to said grid circuit, an anode circuit and means for applying said second signals to said anode circuit to plate modulate the energy applied to said grids.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Transmitters (AREA)
  • Radio Relay Systems (AREA)
US490594A 1943-06-12 1943-06-12 Four course beacon Expired - Lifetime US2429634A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR961093D FR961093A (enrdf_load_stackoverflow) 1943-06-12
US490594A US2429634A (en) 1943-06-12 1943-06-12 Four course beacon
GB5512/45A GB604920A (en) 1943-06-12 1945-03-05 Improvements in or relating to radio signalling systems particularly for radio beacons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US490594A US2429634A (en) 1943-06-12 1943-06-12 Four course beacon

Publications (1)

Publication Number Publication Date
US2429634A true US2429634A (en) 1947-10-28

Family

ID=23948705

Family Applications (1)

Application Number Title Priority Date Filing Date
US490594A Expired - Lifetime US2429634A (en) 1943-06-12 1943-06-12 Four course beacon

Country Status (3)

Country Link
US (1) US2429634A (enrdf_load_stackoverflow)
FR (1) FR961093A (enrdf_load_stackoverflow)
GB (1) GB604920A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515344A (en) * 1946-04-01 1950-07-18 Radio Patents Corp Radio beacon system
US2697220A (en) * 1953-05-06 1954-12-14 Itt Sideband generator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2283677A (en) * 1940-09-27 1942-05-19 Internat Telephone & Radio Mfg Localizer beacon
US2283897A (en) * 1939-04-26 1942-05-26 Internat Telephone & Radio Mfg Antenna system
US2327435A (en) * 1941-10-23 1943-08-24 Fed Telephone & Radio Corp Antenna interaction compensating means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2283897A (en) * 1939-04-26 1942-05-26 Internat Telephone & Radio Mfg Antenna system
US2283677A (en) * 1940-09-27 1942-05-19 Internat Telephone & Radio Mfg Localizer beacon
US2327435A (en) * 1941-10-23 1943-08-24 Fed Telephone & Radio Corp Antenna interaction compensating means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2515344A (en) * 1946-04-01 1950-07-18 Radio Patents Corp Radio beacon system
US2697220A (en) * 1953-05-06 1954-12-14 Itt Sideband generator

Also Published As

Publication number Publication date
FR961093A (enrdf_load_stackoverflow) 1950-05-03
GB604920A (en) 1948-07-13

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