US1454598A - Wireless transmitter - Google Patents

Wireless transmitter Download PDF

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Publication number
US1454598A
US1454598A US431582A US43158220A US1454598A US 1454598 A US1454598 A US 1454598A US 431582 A US431582 A US 431582A US 43158220 A US43158220 A US 43158220A US 1454598 A US1454598 A US 1454598A
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US
United States
Prior art keywords
valve
wireless transmitter
circuit
source
choke coil
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
US431582A
Inventor
Ditcham William Theodore
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.)
RCA Corp
Original Assignee
RCA Corp
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 US1566657D priority Critical patent/US1566657A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to US431582A priority patent/US1454598A/en
Application granted granted Critical
Publication of US1454598A publication Critical patent/US1454598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Definitions

  • the object of this invention is to provide an improved valve transmitter in which the transmission of the interfering noises known as key clicks may be obviated and the valve or valves may be relieved of the full load during the spacing periods of the Morse characters.
  • I connect in the primary power circuit of a valve transmitter a choke coil if the primary current at is alternating, or a resistance if the primary current is direct, and I provide a key or switch by means of which this choke coil or resistance may be shortcircuited for the purpose of signaling.
  • the choke or resistance should be of such a value that when it is not shortcircuited the valve will continue to oscillate but will only generate a small current compared to its normal working current.
  • signals can be transmitted by to varying the strength of the oscillations without stopping their production or sensibly varying their frequency.
  • C is an iron cored c oke coil inserted in the circuit of an alternator A and K is a key by which it can be shortcircuited.
  • T is a transformer, R a rectifier and V the oscillating valve.
  • a wireless transmitter the combination of an oscillating valve, a circuit containing a source of alternating current supply for said valve, a rectifier interposed between said source of supply and said valve, a choke coil connected in said circuit, and means for short circuiting said choke coil.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electrotherapy Devices (AREA)
  • Woven Fabrics (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Circuits Of Receivers In General (AREA)
  • Transmitters (AREA)

Description

May'8, 1923. 1,454,598 w. T. DlTCHAM WIRELESS TRANSMITTER Filed Dec. 18, 1920 8140 an l'o z William Z 91mm Jaw ' Patented May 8, W23,
tartan stares teases earner WELIAH TEODOEE DITCBLAIM, F TWICKEN'HAM, ENGLAND, ASSIGNOR T0 RADIO COBPOBAE'ION OF AMERICA, ()F m YQRK, N. Y., A CORPORATION OF DELAWARE.
Application filed December is, 1920. serial no. 431,582.
To all whom it may concem:
Be it known that 1, WILLIAM THEODORE Drromar a subject of GreatBritain, residing at Kildary, Lebanon Park, Twickenham, in the county of Middlesex, England,
have invented certain new and useful improvements in Wireless Transmitters, of which the following is a specification accompanied by drawings.
The object of this invention is to provide an improved valve transmitter in which the transmission of the interfering noises known as key clicks may be obviated and the valve or valves may be relieved of the full load during the spacing periods of the Morse characters.
According to this invention I connect in the primary power circuit of a valve transmitter a choke coil if the primary current at is alternating, or a resistance if the primary current is direct, and I provide a key or switch by means of which this choke coil or resistance may be shortcircuited for the purpose of signaling. The choke or resistance should be of such a value that when it is not shortcircuited the valve will continue to oscillate but will only generate a small current compared to its normal working current. Thus signals can be transmitted by to varying the strength of the oscillations without stopping their production or sensibly varying their frequency.
My invention is illustrated in the accompanyin diagram, in which C is an iron cored c oke coil inserted in the circuit of an alternator A and K is a key by which it can be shortcircuited. T is a transformer, R a rectifier and V the oscillating valve.
Having now particuarly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a wireless transmitter, the combination of an oscillating valve, a circuit containing a source of alternating current supply for said valve, a rectifier interposed between said source of supply and said valve, an impedance connected in said circuit, and means for short circuiting said impedance.
2. In a wireless transmitter, the combination of an oscillating valve, a circuit containing a source of alternating current supply for said valve, a rectifier interposed between said source of supply and said valve, a choke coil connected in said circuit, and means for short circuiting said choke coil.
3. The combination claimed in claim 1 in which said impedance is of such value that the valve will continue to oscillate at substantially the same frequency regardless of 60 the position of the short circuiting means.
WILLIAM rnnononn DITCHAM.
US431582A 1920-12-18 1920-12-18 Wireless transmitter Expired - Lifetime US1454598A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US1566657D US1566657A (en) 1920-12-18 Wireless transmitter
US431582A US1454598A (en) 1920-12-18 1920-12-18 Wireless transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US431582A US1454598A (en) 1920-12-18 1920-12-18 Wireless transmitter

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US1454598A true US1454598A (en) 1923-05-08

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US431582A Expired - Lifetime US1454598A (en) 1920-12-18 1920-12-18 Wireless transmitter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591316A (en) * 1943-03-06 1952-04-01 Hartford Nat Band And Trust Co Device for producing an oscillatory circuit tuned to an ultrahigh frequency

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591316A (en) * 1943-03-06 1952-04-01 Hartford Nat Band And Trust Co Device for producing an oscillatory circuit tuned to an ultrahigh frequency

Also Published As

Publication number Publication date
US1566657A (en) 1925-12-22

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