US2213105A - Radio control system - Google Patents

Radio control system Download PDF

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Publication number
US2213105A
US2213105A US303890A US30389039A US2213105A US 2213105 A US2213105 A US 2213105A US 303890 A US303890 A US 303890A US 30389039 A US30389039 A US 30389039A US 2213105 A US2213105 A US 2213105A
Authority
US
United States
Prior art keywords
relay
radio
transmitters
transmitter
circuit
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
US303890A
Other languages
English (en)
Inventor
Laube Otto 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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US303890A priority Critical patent/US2213105A/en
Application granted granted Critical
Publication of US2213105A publication Critical patent/US2213105A/en
Priority to FR867829D priority patent/FR867829A/fr
Priority to BE440881D priority patent/BE440881A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/24—Relay circuits using discharge tubes or semiconductor devices

Definitions

  • This invention relates to electrical signaling systems and more particularly to radio transmitting systems. Still more particularly this invention relates to arrangements for interconnecting radio transmitters operating on the same frequency so that only one of the radio transmitters will be transmitting signals at a time.
  • radio telephone service it is often desirable to have two or more radio transmitters share a common radio frequency.
  • This is radio telephone service to river boats in which several shore stations are provided along the river to insure complete coverage throughout its length.
  • Each of these, complete with radio transmitter radio receivers and a control terminal, is operated from a toll switchboard in the area served.
  • this invention will provide a scheme for 'interlocking the circuits associated with two or more radio transmitters 'to permit their operation one at a time.
  • the reference characters RTA- and RTB designate two of a plurality of radiotransmitters of well-known construction both of which may be adjusted to transmit signais modulated upon carrier waves of identical frequency
  • the input circuits of the radio transmitter RTA may be connected over a telephone designated' X to a jack JA and a plug PA as is well understood in the art.
  • the radio transmitter RTB may be connected over a similar telephone line to a jack JB and plug PB.
  • At toll ofiice A there may be a plurality of jacks similar to the one designated JA and in multiple with in accordance with the well-known multiple jack switchboard arrangement.
  • the sleeve of the jack JA may be connected to the winding or" a sleeve relay RiA, the current for which may be supplied by a battery B1A which is connected to the sleeve terminal of the plug PA.
  • This relay is normally unoperated. But when it is operated, a battery 132A may supply current over the armature and make-contact of the sleeve relay RiA and over the upper armature and back contact of a relay designated RSA to the winding of a relay RiA. However, the relay R4A is normally unoperated. But, when it is operated by the current supplied by battery BzA,
  • a battery BSA will supply current over the upper armature and make-contact of the relay R4A and over a circuit 'y to the winding of a remote control relay RaA.
  • relay PsA When relay PsA is operated, it will complete the circuit of a power relay RSA which controls the radio transmitter RTA.
  • the radio transmitter RTA will then transmit signals through space, these signals being modulated on a carrier wave peculiar to the radio transmitter RTA.
  • the manner in which the circuit prevents the operation of the two radio transmitters RTA and RTB at the same time will be described hereinafter. But it is noted that the apparatus at both toll oices A and B are in the condition shown in the drawing when the two radio transmitters RTA and RTB are in an idle condition.
  • the operator at the toll oce A wishes to transmit a call to a station at some remote point which may be located on one of the river boats.
  • the operator will then merely pick up one of the plugs such as PA over Which the signals will be supplied and plug it into a jack such as JA associated with the radio transmitter RTA which is intended to supply the radio wave upon which the signals will be modulated.
  • the sleeve relay RiA will be operated by current supplied by battery BiA.
  • the operation of the relay R1A will cause the operation of the relay RiA, current for which is supplied by battery BzA over the circuit including the armature and make Contact of the relay RiA and the upper armature and back contact of the relay RsA.
  • the remote control relay R5A Immediately after the relay RiA operates, the remote control relay R5A will be operated, current for which is supplied by battery BaA over the armature and make contact of the relay RAA. And the remote control relay RSA will in turn operate the power relay RsA which in turn will cause the radio transmitter to go on the air and transmit the signals supplied thereto from the source of signals.
  • the operation of the relay R4A will cause the battery BAA to supply current over a line L which may be a D. C. telegraph circuit as indicated in the drawing, this line extending to all other toll otccs which are connected to the various radio transmitters having the same frequency assignment as the transmitter RTA of the toll oice A.
  • This current will cause the operation of the relay RAB at the toll oiice B, the current from battery BAA, iiowing over the line L and over the lower armature and back contact of the relay R4B and through the winding of the relay R3B.
  • the relay RsB Will become operated and remain operated as long as the plug PA is in engagement with the jack JA at the toll oice A. Relays similar to relay R3B will, of course, be operated at the other toll oiiices which are not specifically illustrated in the drawing.
  • the operation of the relay R313 will cause the operation of the busy lamp LB, current for which is supplied by battery B5B, the circuit for lamp LB being completed over the lower armature and make contact oi the relay RaB. As soon as lamp LB lights up, it will indicate to the operator at the toll oiice B that the radio circuit is already in use elsewhere and that she may not use it.
  • the operation of the relay 3B will also open up the local circuit between the sleeve relay RiB and relay RiB. This is because the circuit which supplies current from battery B2B to the winding of relay RAB is opened at the upper armature and back contact of relay R35 at all times when the latter relay is operated.
  • the radio transmitter RTB will remain off the air. This is an important feature of this invention. Were the operator at the toll oice B to disregard the busy signal indicated by the lighted lamp LB and attempt to use the radio circuit she would be unable to do so.
  • the relay RAB when unoperated, prevents the battery B3B from transmitting current to the winding of the remote control relay RsB over the circuit which includes the upper armature and make contact of relay RAB and the circuit y.
  • the power relay RGB When the relay RsB is unopcrated, the power relay RGB will also be unoperated and, hence, the radio transmitter RTB will remain 01T the air. It will thus be obvious that the transmitter RTB and all other transmitters operating on the same frequency, which are connected to the line L, will remain off the air as long as the transmitter RTA is on the air.
  • the arrangement illustrated in the drawing prevents the simultaneous operation of two or more radio transmitters sharing a common or single frequency.
  • the arrangement provides, through its busy lamps and the circuits connected thereto, means for rapidly notifying all of the operators associated with the system when any one of the several transmitters is in use.
  • the arrangement illustrated in the drawing obviates the diierent types of interference and crosstalk usually occurring when there is simultaneous operation of two or more transmitters sharing a common frequency.
  • Two transmitters designed to transmit current of the same irequency generally do not emit exactly the same frequency and hence when both transmitters are on the air, the receiving circuit will register an undesirable effect.
  • This undesirable eiect results from beatingfthe Waves emitted by two transmitters having somewhat different frequencies.
  • the magnitude of the undesirable current received will depend upon the location of the receiving set. However, were it possible to obtain two exactly equal frequencies from two radio transmitters, the beating eiect might be avoided but there would nevertheless be a certain amount of crosstalk. All this will be apparent to those skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
US303890A 1939-11-10 1939-11-10 Radio control system Expired - Lifetime US2213105A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US303890A US2213105A (en) 1939-11-10 1939-11-10 Radio control system
FR867829D FR867829A (fr) 1939-11-10 1940-11-28 Systèmes de signalisation électriques
BE440881D BE440881A (en(2012)) 1939-11-10 1941-03-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US303890A US2213105A (en) 1939-11-10 1939-11-10 Radio control system

Publications (1)

Publication Number Publication Date
US2213105A true US2213105A (en) 1940-08-27

Family

ID=23174136

Family Applications (1)

Application Number Title Priority Date Filing Date
US303890A Expired - Lifetime US2213105A (en) 1939-11-10 1939-11-10 Radio control system

Country Status (3)

Country Link
US (1) US2213105A (en(2012))
BE (1) BE440881A (en(2012))
FR (1) FR867829A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589158A (en) * 1948-04-02 1952-03-11 Bell Telephone Labor Inc Mobile-radio and wire system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589158A (en) * 1948-04-02 1952-03-11 Bell Telephone Labor Inc Mobile-radio and wire system

Also Published As

Publication number Publication date
FR867829A (fr) 1941-11-29
BE440881A (en(2012)) 1941-04-30

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