US2434917A - Mechanical modulator - Google Patents

Mechanical modulator Download PDF

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Publication number
US2434917A
US2434917A US509252A US50925243A US2434917A US 2434917 A US2434917 A US 2434917A US 509252 A US509252 A US 509252A US 50925243 A US50925243 A US 50925243A US 2434917 A US2434917 A US 2434917A
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US
United States
Prior art keywords
line
impedance
gap
load
source
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
US509252A
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English (en)
Inventor
Fuchs Morton
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 FR954971D priority Critical patent/FR954971A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US509252A priority patent/US2434917A/en
Application granted granted Critical
Publication of US2434917A publication Critical patent/US2434917A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas

Definitions

  • . -It is often desired to modulate.energyvtransmitted with lfixed tone "frequencies, Hfor example, in radidbeacons.
  • variable impedance maytake thefform .ofiaicondenser coupled v across @the .break in they outer conductor, .or between anopen end of the .icondutonatld ground or .v another neutral potential source.
  • Fig.5 is'a, modifiadrstructural arrangement embo ied-lnmyinvention; and a.
  • Q' I s Fig. '6 is, azstillufurther structural arrangement embod in omyinvention. o
  • a source :l3iis coupe'wbetwee'n .-,c0nductor VH and lzfatone end bisection 1'0 and aload M is ;c,odpledfb'etwieen the pentral conductor :I 2 and ,grbund il 1;
  • a length of coaxial line 20 provided with an outer conductor 2
  • High frequency source 23 is connected between conductors 2
  • is broken at 32 providing a gap which serves to introduce an impedance effectively in series withthe load 24 connected between the center conductor and the outer conductor 2
  • a conductive support 25 serves to connect the end. of line 20 adjacent source 23 to a source of ground or neutral potential 21.
  • adjacent load 24 is also connected with ground or neutral potential, as shown at 33 and 34.
  • the variable impedance is shown as a condenser 26 comprising stator plates 28 and 29 fixed respectively driven at a constant speed by a motor 3
  • the rotor 38 is not exactly at ground potential since the rotor shaft and support has some electrical length. Actually, it may be preferable to construct the modulating arrangement of two mechanically balanced sections, such as shown in Fi 5.
  • the line 40 is provided with an outer conductor 4i and inner conductor 42 coupled to a source 43.
  • a gap 53 is provided and at equi-distant points spaced on opposite sides of gap 53 are provided supports 45 and 56 which serve to connect the two ends of line 40 to ground or other neutral potential source.
  • the lengths of line between the gap and supporting points 45 and 56 are preferably made equal, and in the order of a quarter wavelength long.
  • the variable impedance device comprises a condenser 46 having stator plates 48 and 49 fastened to outer conductor 4
  • Fig. 6 is shown a structural arrangement substantially similar to Fig. 5 in electrical efiect.
  • the coaxial line 60 is bent in substantially a U-form with a gap 12 provided substantially at the apex of the U.
  • Source 63 supplies energy to load 64 over the two conductors BI, 62 of the coaxial line.
  • a common supporting and ground plate 55 is provided cutting the conductors transversely across the legs of the U.
  • stator plates 68, 69 of condenser 66 on opposite sides of gap I2 are provided stator plates 68, 69 of condenser 66 and between these plates is supported the rotor 10 of the condenser. This rotor may be rotated at a desired constant speed by a suitable motor 1 I.
  • variable condensers are the preferable-forms of modulators used with the system of my invention, it should be clear that this is shown only by way of example. In connec tion with the mechanical modulating arrangement, however, condenser arrangements are generally preferred over inductors since considerably less impedance losses will occur in the capacitive than would occur in the inductive impedances.
  • a modulating system for imparting a modulation to energy supplied from a source to a given load comprising a section of coaxial transmission line, means for coupling said source between the inner and outer conductors of said transmission line at one end thereof, means for coupling said load between the inner conductor at the other end of said line and the outer conductor at said one end thereof.
  • the outer conductor of said line being provided with a gap intermediate the ends thereof whereby the impedance with respect to ground of theouter surface of said outer line between its ends is effectively in series with said load, variable impedance means effectively bridged across said gap, and means for varying said variable impedance to modulate the energy supplied to said load.
  • a modulating system according to claim 1 wherein said section of coaxial transmission line from said source to said gap is made effectively a quarter of a wavelength long, and. wherein said variable impedance is made variable between an effective short circuit and an effective open circult condition, whereby one hundred percent modulation is substantially obtained.
  • a modulating system for imparting a modulation to energy supplied from a source to a given load comprising a coaxial transmission line, the outer conductor of said line being provided with a gap, means for coupling said source between the inner and outer conductors of said line 'at one end thereof, means for connecting said outer conductor on the sideofsaid gap toward said source to a neutral potential source, at a predetermined distance from said gap, a load connected to said line between the inner and outer conductors on the end remote from said source.
  • avariable impedance means coupled betweensaid outer conductors, and means for varying said variable impedance in accordance with modu lating signals, to impart modulations to the energy supplied to said load.
  • A' modulating system according to claimji, further comprising means for connecting the end of said'outer conductor immediately beyond said gap on the load end of said conductor tosaid neutral potential source.
  • variable impedance comprises a rotary variable condenser
  • means for varying said impedance comprises a drive means for rotating said condenser
  • a modulating system comprising a coaxial line having an inner conductor and an outer conductor, the outer conductor being provided with a gap therein, means for connecting said outer conductor to a neutral potential source at equally spaced points on opposite sides of said gap, a high frequency energy source coupled between said inner and outer conductor at one end of the line, a load coupled between said inner and outer conductors at the opposite end of the line, and means for varying the impedance to the energy from said source as supplied to said load, comprising a variable condenser bridged across said gap.
  • a modulating system wherein said coaxial line is formed in a substantially U shaped section, said gap being provided at the apex of said U.
  • said coaxial line is formed in a substantially U shaped section, said gap being provided at the apex of said U, said variable condenser comprising stator plates fastened to said outer conductor on opposite sides of said gap, and a rotor plate mounted for rotation between said stator plates, further comprising means for rotating said rotor plate.
  • variable condenser comprises stator plates fastened to said outer conductors on opposite sides of said gap, and a rotor plate mounted for rotation in spaced relation between said plates, further comprising means for rotating said rotor plate at a predetermined speed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US509252A 1943-11-06 1943-11-06 Mechanical modulator Expired - Lifetime US2434917A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR954971D FR954971A (fr) 1943-11-06
US509252A US2434917A (en) 1943-11-06 1943-11-06 Mechanical modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US509252A US2434917A (en) 1943-11-06 1943-11-06 Mechanical modulator

Publications (1)

Publication Number Publication Date
US2434917A true US2434917A (en) 1948-01-27

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Family Applications (1)

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US509252A Expired - Lifetime US2434917A (en) 1943-11-06 1943-11-06 Mechanical modulator

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US (1) US2434917A (fr)
FR (1) FR954971A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545623A (en) * 1948-08-17 1951-03-20 Kenneth R Mackenzie Frequency modulation system
US2556669A (en) * 1948-02-21 1951-06-12 Bell Telephone Labor Inc Microwave transmission system
US2560859A (en) * 1944-03-02 1951-07-17 Csf Method for modulating the highfrequency energy transmitted in hollow dielectric guides
US2593463A (en) * 1946-06-21 1952-04-22 Bell Telephone Labor Inc Frequency stabilized microwave oscillator
US2660709A (en) * 1951-11-10 1953-11-24 Standard Telephones Cables Ltd Mechanical modulator
DE1030897B (de) * 1952-06-25 1958-05-29 Int Standard Electric Corp Erzeugung eines Rundstrahldiagramms mit je zwei diagonal zu einem Paar zusammengeschalteten Richtantennen
WO2012101143A1 (fr) * 2011-01-28 2012-08-02 Ion Beam Applications Condensateur rotatif variable pour synchrocyclotron

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108867A (en) * 1934-01-27 1938-02-22 Rca Corp Radio direction system
USRE20859E (en) * 1933-01-19 1938-09-13 Electric circuit arrangement
US2228692A (en) * 1938-10-14 1941-01-14 Washington Inst Of Technology Load stabilizing means for modulation systems
US2232591A (en) * 1938-06-27 1941-02-18 Washington Inst Of Technology Modulation system
US2232592A (en) * 1938-07-18 1941-02-18 Washington Inst Of Technology Modulation system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE20859E (en) * 1933-01-19 1938-09-13 Electric circuit arrangement
US2108867A (en) * 1934-01-27 1938-02-22 Rca Corp Radio direction system
US2232591A (en) * 1938-06-27 1941-02-18 Washington Inst Of Technology Modulation system
US2232592A (en) * 1938-07-18 1941-02-18 Washington Inst Of Technology Modulation system
US2228692A (en) * 1938-10-14 1941-01-14 Washington Inst Of Technology Load stabilizing means for modulation systems

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2560859A (en) * 1944-03-02 1951-07-17 Csf Method for modulating the highfrequency energy transmitted in hollow dielectric guides
US2593463A (en) * 1946-06-21 1952-04-22 Bell Telephone Labor Inc Frequency stabilized microwave oscillator
US2556669A (en) * 1948-02-21 1951-06-12 Bell Telephone Labor Inc Microwave transmission system
US2545623A (en) * 1948-08-17 1951-03-20 Kenneth R Mackenzie Frequency modulation system
US2660709A (en) * 1951-11-10 1953-11-24 Standard Telephones Cables Ltd Mechanical modulator
DE939881C (de) * 1951-11-10 1956-03-08 Int Standard Electric Corp Mechanischer Modulator
DE1030897B (de) * 1952-06-25 1958-05-29 Int Standard Electric Corp Erzeugung eines Rundstrahldiagramms mit je zwei diagonal zu einem Paar zusammengeschalteten Richtantennen
WO2012101143A1 (fr) * 2011-01-28 2012-08-02 Ion Beam Applications Condensateur rotatif variable pour synchrocyclotron
US9355784B2 (en) 2011-01-28 2016-05-31 Ion Beam Applications, Sa Variable rotating capacitor for synchrocyclotron

Also Published As

Publication number Publication date
FR954971A (fr) 1950-01-06

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