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US1281742A - Wireless telegraphy and telephony. - Google Patents

Wireless telegraphy and telephony. Download PDF

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Publication number
US1281742A
US1281742A US24638518A US24638518A US1281742A US 1281742 A US1281742 A US 1281742A US 24638518 A US24638518 A US 24638518A US 24638518 A US24638518 A US 24638518A US 1281742 A US1281742 A US 1281742A
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US
United States
Prior art keywords
telephony
aerial
telephone
wireless telegraphy
thermic
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
US24638518A
Inventor
Hendrik Zwaardemaker
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.)
DE NEDERLANDSCHE THERMO-TELEPHOON Mij
NL THERMO TELEPHOON MIJ DE
Original Assignee
NL THERMO TELEPHOON MIJ DE
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 NL THERMO TELEPHOON MIJ DE filed Critical NL THERMO TELEPHOON MIJ DE
Priority to US24638518A priority Critical patent/US1281742A/en
Application granted granted Critical
Publication of US1281742A publication Critical patent/US1281742A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/1441—Balanced arrangements with transistors using field-effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits

Definitions

  • HENDRIX ZW'AAEDEMAKER OF UTRECHT, NETHERLANDS, ASSIGNOR TO DE NEDER- LANDSCl-IE THEEMG-TELEIPI-IOGN MAATSCHAPPIJ, 0F UTI-TECHT, NETHERLANDS, A. LIMITED LIABILEIY CGIEPANY OF THE NETHERLANDS.
  • Patented Qct. is, rare.
  • the invention relates to further improvements in the system of Wireless telegraphy and telephony, and is based on the observed principle, that the sensitiveness of the thermic telephone, serving simultaneously as detector, can be considerably increased, when it Works with polarization, for instance by pro-heating it by a constant current.
  • the aerial conductor a is earthed through aprimary coil 0, located in inductive relation to the secondary coil 01, the length of which can be exactly tuned.
  • To the coil d are connected in series the thermic telephone 5 and the battery 6 having for instance a tension of 2 or l volts.
  • sound condenser 7 which can be tuned, may be connected in parallel to the thermic telephone Z.
  • the reception by the receiving station of the electric Waves, emanating from the transmitting station, Will besatisfactory and can be distinctly observed by means of the thermic telephone, even when the oscillationsare weal: and heavily damped. It has proved satisfactory, to listen by the thermic telephone at the vertical part of the serial conductor a to which it is connected by one pole, taking the other pole in the hand in order to profit from the action of the human body capacity.
  • the resistance of the themic telephone can be brought in accordance with the im- F or increasing the pedance of the secondary coil 03.
  • the air space of the thermic telephone should be as small as possible, and generally itsv resistance should be large. For this purpose, a great number of heating conductors are connected in series.
  • An apparatus for wireless telegraphy or telephony comprising an aerial, a thermic telephone in electric relation to said aerial, and means for imparting polarization to said telephone, irrespective of the action of the aerial.
  • An apparatus for Wireless telegraphy and telephony comprising an aerial, a thermic telephone in electric relation to said aerial, and means for heating said telephone, irrespective of'the action of the aerial.
  • An apparatus for Wireless telegraphy and telephony comprising an aerial, a thermic telephone in electric relation to said aerial, and a source of electric current in .series and in permanent circuit with said telephone, to polarize and. heat it irrespective of the action of said aerial.
  • An apparatus for Wireless tele-graphy and telephony comprising an aerial, a thermic telephone in electric relation to said aerial, and a source of constant electric current in circuit with said telephone, to polarize and heat it Without reference to the action of said .aerial.
  • an apparatus for wireless telegraphy and telephony comprising an aerial, a thermic telephone in electric relation to said aerial, a source of electric current in circuit with said telephone, and a variable condenser included in said circuit in series With the source of electricity, but in parallel With said thermic telephone.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

H. ZWAARDEMAKER. WIRELESS TELEGRAPHY AND TELEPHONY.
APPLICATION FILED JULY 23. I918.
Patented. 0st. 15, 1918.
m MM m EL mu Fltjli,
HENDRIX ZW'AAEDEMAKER, OF UTRECHT, NETHERLANDS, ASSIGNOR TO DE NEDER- LANDSCl-IE THEEMG-TELEIPI-IOGN MAATSCHAPPIJ, 0F UTI-TECHT, NETHERLANDS, A. LIMITED LIABILEIY CGIEPANY OF THE NETHERLANDS.
HIRE LESS TELEGRAPHY AND TELEPHONY.
Specification of Letters Patent.
Patented Qct. is, rare.
application filed July 23, 1918. Serial N 0. 246,385.
To all whom it may concern:
'Be it known that 1, Prof. Dr. HENDRIX Zwaannmmnnu, professor of the University of Utrecht, a subject of the Queen of the Netherlands, residing at Utrecht, in the glProvmce of Utrecht, 1n the kingdom of the Netherlands, have invented certain new and useful improvements in Wireless Telegraphy and Telephony, of which the following is a specification.
The invention relates to further improvements in the system of Wireless telegraphy and telephony, and is based on the observed principle, that the sensitiveness of the thermic telephone, serving simultaneously as detector, can be considerably increased, when it Works with polarization, for instance by pro-heating it by a constant current.
In the accompanying drawing an exampie or" my invention, representing a receiving station, Working on the new principle, is given.
The aerial conductor a is earthed through aprimary coil 0, located in inductive relation to the secondary coil 01, the length of which can be exactly tuned. To the coil d are connected in series the thermic telephone 5 and the battery 6 having for instance a tension of 2 or l volts. sound condenser 7", which can be tuned, may be connected in parallel to the thermic telephone Z The reception by the receiving station of the electric Waves, emanating from the transmitting station, Will besatisfactory and can be distinctly observed by means of the thermic telephone, even when the oscillationsare weal: and heavily damped. It has proved satisfactory, to listen by the thermic telephone at the vertical part of the serial conductor a to which it is connected by one pole, taking the other pole in the hand in order to profit from the action of the human body capacity.
The resistance of the themic telephone can be brought in accordance with the im- F or increasing the pedance of the secondary coil 03. The air space of the thermic telephone should be as small as possible, and generally itsv resistance should be large. For this purpose, a great number of heating conductors are connected in series.
hat I claim is: z
1. An apparatus for wireless telegraphy or telephony, comprising an aerial, a thermic telephone in electric relation to said aerial, and means for imparting polarization to said telephone, irrespective of the action of the aerial.
2. An apparatus for Wireless telegraphy and telephony, comprising an aerial, a thermic telephone in electric relation to said aerial, and means for heating said telephone, irrespective of'the action of the aerial.
3. An apparatus for Wireless telegraphy and telephony, comprising an aerial, a thermic telephone in electric relation to said aerial, and a source of electric current in .series and in permanent circuit with said telephone, to polarize and. heat it irrespective of the action of said aerial.
4. An apparatus for Wireless tele-graphy and telephony, comprising an aerial, a thermic telephone in electric relation to said aerial, and a source of constant electric current in circuit with said telephone, to polarize and heat it Without reference to the action of said .aerial.
,5.-An apparatus for wireless telegraphy and telephony, comprising an aerial, a thermic telephone in electric relation to said aerial, a source of electric current in circuit with said telephone, and a variable condenser included in said circuit in series With the source of electricity, but in parallel With said thermic telephone.
In testimony whereof I have hereunto set my hand.
' PROF. DR. HENDRIK ZWAARDEHAKER. Witnesses:
D. KLEIJN, M. ALVARADO.
US24638518A 1918-07-23 1918-07-23 Wireless telegraphy and telephony. Expired - Lifetime US1281742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US24638518A US1281742A (en) 1918-07-23 1918-07-23 Wireless telegraphy and telephony.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24638518A US1281742A (en) 1918-07-23 1918-07-23 Wireless telegraphy and telephony.

Publications (1)

Publication Number Publication Date
US1281742A true US1281742A (en) 1918-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US24638518A Expired - Lifetime US1281742A (en) 1918-07-23 1918-07-23 Wireless telegraphy and telephony.

Country Status (1)

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US (1) US1281742A (en)

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