US2276122A - Portable radio set - Google Patents

Portable radio set Download PDF

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Publication number
US2276122A
US2276122A US287190A US28719039A US2276122A US 2276122 A US2276122 A US 2276122A US 287190 A US287190 A US 287190A US 28719039 A US28719039 A US 28719039A US 2276122 A US2276122 A US 2276122A
Authority
US
United States
Prior art keywords
radio set
control
portable radio
connection
cable
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
US287190A
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English (en)
Inventor
Tull Hansheinrich
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2276122A publication Critical patent/US2276122A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J9/00—Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification
    • H03J9/002—Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification comprising one or more tuning stages separated from the rest of a receiver

Definitions

  • Portable transmitting and receiving radio apparatus for use on the march is usually arranged so that tuning and switching equipment is carried on ones back in a knapsack.
  • the disclosed invention proposes, for the simplication of such apparatus, that the control equipment be disposed in a special box which requires little space and which, for example, might be carried in the operator's pocket near the belt.
  • connection from the control box to the knapsack radio set accordingly consists of a short multi-circuit cable, which is plugged into the knapsack set.
  • the invention proposes that all terminations and control devices be designed to have a common reference potential, which, for example, equals the cathode potential.
  • the elements A of the set are assembled in a small control box which is connected to the knapsack radio equipment C, of which only a part of the circuit is shown, by the multi-circuit cable B.
  • a telephone receiver F connected to output transformer U2 a microphone M connected to input transformer Ul, and a telegraph key S, and a relay RI operated by microphone M or key S are inserted or removed from circuit by the main control switch H.
  • Relay Rl thus serves to connect the transmitter with the antenna during transmitting periods and the receiver to the antenna when no transmission is taking place.
  • variable high resistance D is provided to control feedback and is of special small construc tion. In cooperation with two more resistances W in series inside the knapsack equipment, it varies the screen grid voltage of the audion tube Au, and accordingly effects regulation of the feedback.
  • the ne tuning of the receiver is accomplished with a variable condenser K of the smallest possible size, and the terminal capacitance of which approximately matches the self-capacity of the line in the combination cable B.
  • a combined capacity which may be much too great for a secof the oscillator circuit a trimming condenser T1' be employed.
  • the combined capacity is thereby through a series connection reduced to an allowable value.
  • the scope of control is, however, by no means decreased.
  • the invention may be adapted to supervise antenna radiation in that a circuit may be coupled to the antenna by a thermo-couple E which is alternately coupled to cathode potential and to a variable inductive indicator J, disposed in the control box.
  • a radio set arranged for remote control comprising a first compartment containing the principal components of the set including a tube having at least a cathode, a control grid and an anode and including an oscillatory circuit connected between said control grid and cathode, a second compartment containing electrical control elements for said set including a variable condenser for tuning said oscillatory circuit, a multi-conductor electric cable interconnecting said control elements and said components, a common connection over said multi-conductor cable from one side of said variable condenser and one side of each of the other control elements to a reference point of stable potential in said rst compartment, a trimming condenser in said first compartment, a connection from one side of said trimming condenser to said oscillatory circuit, a connection from the other side of said trimming condenser to one end of one of the conductors of said multi-electrode cable, and a connection from the other end of said conductor to the other side of said variable condenser.
  • a radio set according to claim 1 further comprising an antenna, a thermo-couple coupled to said antenna, an indicating instrument in saidY second compartment, a connection from one branch of said thermo-couple to said reference point of stable potential and a connection from the other branch of said thermo-couple over a conductor of said multi-conductor cable to said indicating instrument.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Circuits Of Receivers In General (AREA)
US287190A 1938-08-04 1939-07-29 Portable radio set Expired - Lifetime US2276122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE212947X 1938-08-04

Publications (1)

Publication Number Publication Date
US2276122A true US2276122A (en) 1942-03-10

Family

ID=5810744

Family Applications (1)

Application Number Title Priority Date Filing Date
US287190A Expired - Lifetime US2276122A (en) 1938-08-04 1939-07-29 Portable radio set

Country Status (2)

Country Link
US (1) US2276122A (de)
CH (1) CH212947A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433599A (en) * 1942-12-31 1947-12-30 Wheelco Instr Company Control apparatus
US2515213A (en) * 1943-05-20 1950-07-18 Rca Corp Ultra high frequency communication system
US2693526A (en) * 1949-06-15 1954-11-02 Automatic Elect Lab Single channel single frequency mobile radio telephone system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2433599A (en) * 1942-12-31 1947-12-30 Wheelco Instr Company Control apparatus
US2515213A (en) * 1943-05-20 1950-07-18 Rca Corp Ultra high frequency communication system
US2693526A (en) * 1949-06-15 1954-11-02 Automatic Elect Lab Single channel single frequency mobile radio telephone system

Also Published As

Publication number Publication date
CH212947A (de) 1940-12-31

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