US1674505A - Telegraphic transmitter - Google Patents

Telegraphic transmitter Download PDF

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Publication number
US1674505A
US1674505A US167568A US16756827A US1674505A US 1674505 A US1674505 A US 1674505A US 167568 A US167568 A US 167568A US 16756827 A US16756827 A US 16756827A US 1674505 A US1674505 A US 1674505A
Authority
US
United States
Prior art keywords
circuit
anode
smoothing
source
potential
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
US167568A
Other languages
English (en)
Inventor
Elmer W Engstrom
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.)
General Electric Co
Original Assignee
General Electric Co
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 NL23503D priority Critical patent/NL23503C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US167568A priority patent/US1674505A/en
Priority to DEI33180D priority patent/DE476062C/de
Priority to FR649493D priority patent/FR649493A/fr
Priority to GB4539/28A priority patent/GB285357A/en
Application granted granted Critical
Publication of US1674505A publication Critical patent/US1674505A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • My invention relates to telegraphic transmitters employing vacuum tube oscillatlon generators in which theanode potential for the generator is supplied from any su1table source through appropriate smoothing means.
  • smoothing reactors in these systems is 11mited in that they delay the flow of direct current to the oscillation generator and'ln that they are conducive to the transient condition mentioned. This is particularly true if the smoothing reactor be connected on the load side of the last shunt condenser.
  • the last element of the smoothin system consist of a shunt condenser and requently shunt condensers are relied upon altogether for the necessary smoothing. This, however, does not remedy the situation since a transient condition upon closing the signal key remains preventing satisfactory operation of the system, particularly at high speeds.
  • the object of my invention is to overcome the above mentioned disadvantages and to provide a transmitting system which, among other things, may be operated at high speeds, in which the transmitted signal is of desirable wave shape and in which the anode supply is substantially free from transient conditions.
  • 1 indicates the usual three element electron discharge device which is employed as an oscillation generator having its anode and grid connected through condensers 2 to the oscillatory circuit 3 which is associated with the antenna or other load circuit 4.
  • the circuit 5 Connected to the grid circuit of this device is the circuit 5 in which is connected the keying device one side of which is' connected to ground or to cathode potential.
  • This keying device is represented as made u of a condenser" with a contact making nected in shunt thereto, although any of the well-known keying devices may be employed.
  • tosoey 6 conrepresents this same characteristic in a circuit in which my reactance is employed.
  • Fig.- 2 it will be noted that the'direct current upon the initial closing of the key 6 is several times greater than that of the normal current flowing when the contact is closed. This transient is usually of an oscillatory nature and of high frequency. It produces anunsatisfactory wave shape in the signal which is transmitted to the antenna andmay result in injury to the equipment.
  • a telegraphic transmitter employing a vacuum tube oscillation generator having an anode, a source of potential for said anode, a smoothing system associated with said-source, of potential and a surge reactor connected between said 's'moothing system and said oscillation generator, said surge reactor comprising a coil of lowinductance wound upon a core of low reluctance, said inductance and reluctance being such as to produce no appreciable retarding effect upon the initiation of normal anode current,
  • a telegraphic transmitter employing a vacuum tube oscillation generator having an anode, a source of direct current potential for said anode comprising an alternating current source and rectifying means associated with said alternating current source, a smoothing condenser connected across the circuit of said rectifying means, and a surge reactor connected between said smoothing condenser and said oscillation generator, sa d surge reactor comprismg a coil of low Inductance wound upon a core of low reluctance, said inductance and s5 reluctance being such as toproduce no appreciable retarding effect upon the initiation of normal anode current, whereby surges will be substantiall eliminated.
  • a telegrap ic transmitter em loy- 9ov ing a vacuum tube'oscillation generator ving an anode circuit and a grid 'circuit, a means in said grid circuit for keying said transmitter, a source of direct current potential for said anode circuit comprising an alternating current source and rectifying ,means associated w1th said alternating current source, a smoothing condenser connected across the circuit Of said rectifying means and a surge reactor con- 10o inductance andreluctance being such as to 108 produce no appreciable retarding efl'ectupon the intiation of normal 1 anode current,

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Particle Accelerators (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Amplifiers (AREA)
US167568A 1927-02-11 1927-02-11 Telegraphic transmitter Expired - Lifetime US1674505A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL23503D NL23503C (enrdf_load_html_response) 1927-02-11
US167568A US1674505A (en) 1927-02-11 1927-02-11 Telegraphic transmitter
DEI33180D DE476062C (de) 1927-02-11 1928-01-13 Roehrensender
FR649493D FR649493A (fr) 1927-02-11 1928-02-11 Perfectionnements aux transmetteurs radio-télégraphiques
GB4539/28A GB285357A (en) 1927-02-11 1928-02-13 Improvements in telegraphic transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US167568A US1674505A (en) 1927-02-11 1927-02-11 Telegraphic transmitter

Publications (1)

Publication Number Publication Date
US1674505A true US1674505A (en) 1928-06-19

Family

ID=22607889

Family Applications (1)

Application Number Title Priority Date Filing Date
US167568A Expired - Lifetime US1674505A (en) 1927-02-11 1927-02-11 Telegraphic transmitter

Country Status (5)

Country Link
US (1) US1674505A (enrdf_load_html_response)
DE (1) DE476062C (enrdf_load_html_response)
FR (1) FR649493A (enrdf_load_html_response)
GB (1) GB285357A (enrdf_load_html_response)
NL (1) NL23503C (enrdf_load_html_response)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780705A (en) * 1954-11-19 1957-02-05 Resdel Engineering Corp Dielectric heater

Also Published As

Publication number Publication date
NL23503C (enrdf_load_html_response)
DE476062C (de) 1929-05-11
GB285357A (en) 1928-06-21
FR649493A (fr) 1928-12-22

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