US1818669A - Radio frequency telegraphy and telephony system - Google Patents

Radio frequency telegraphy and telephony system Download PDF

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Publication number
US1818669A
US1818669A US1338A US133825A US1818669A US 1818669 A US1818669 A US 1818669A US 1338 A US1338 A US 1338A US 133825 A US133825 A US 133825A US 1818669 A US1818669 A US 1818669A
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United States
Prior art keywords
radio frequency
news
wire
energy
wireless
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Expired - Lifetime
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US1338A
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English (en)
Inventor
Beckmann August
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Telefunken AG
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Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/58—Repeater circuits
    • 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
    • H04B7/12—Frequency diversity

Definitions

  • a BECKMANN- 1,313,669 I Mme FREQUENCY TELEGRAPHY AND TELEPHONY SYSTEM Filed Jan. 9, 1925 2 Sheets-Sheet 1 INVENTOR AUGUST aicmmm ORNEY 1931.
  • My invention relates to a novel means and method for disseminating news or intelligence from a central station.
  • One object of the invention is to provide such a meansand method as will give a very large degree of reliability as well as great efficiency from a standpoint of total power consumed.
  • Another object of the invention is in the novel method and means for receiving and relaying such intelligence.
  • FIG. 1 illustrates the invention as applied to sending
  • Fig. 2 illustrates the to receiving
  • FIG. 3 shows another illustration of the 1n-' vention as applied to sending
  • Fig. 4 shows an illustration of the relaying arrangement
  • Figs. 5, 6 and 7 are schematic diagrams showing the different ways in which the intelligence can be disseminated from a central sending station to the ultimate receivers.
  • he invention has the purpose of organically uniting both operating methods and therefore gives new possibilities of utilization for,
  • the base for uniting both operating methods is to employ radio frequency waves which are transferred, partly by wireless and partly over wires, for telegraphic and telephonic purposes. According to whether the radio frequency waves traverse the two waysat the same time or after one another, difierent em-g bodinients of the invention are required.
  • the waves may have equal or different frequencies and may also have equal or different functions for attaining certain effects.
  • they may be directive or non-directive; in particular the directive wireless transmission combined with the transmission over wires gives results which can not be attained by the directlve wireless transmission alone.
  • the arrangement can be such, that the radio frequencv waves of the transmitting station are radiated by an aerial as well as transferred to a wire. system.
  • the transmitting station may employ one or more oscillation generators. If only one generator is used, it can be coupled to the same tlIIlQtO the :2:
  • Another kind of distribution of energy consists in providing two separate generators for the aerial and for the wire system. In this case both transmitters can be affected by a common keying device (Morse-key or microphone).
  • Such a transmitter transfers the same news on two ways at the same time.
  • the receivers can also be similarly arranged in such a way that they simultaneously receive the incoming waves from a receiving aerial and a Wire system.
  • a phase regulation which may be necessary in some cases can easily be carried out by known means.
  • This described two-way radio frequency transference has different technical advantages. In the first place it guarantees an increased surety of transmission of news. If the wire connection is for instance interrupted, the news is transferred on the wireless way; on the contrary if at times the wireless transmission is disturbed by strong atmospherics, the reception of the signals is maintained, as the wire communication is not influenced by these disturbances. Therefore, it is advisable to arrange the receiver in such a way that it can be disconnected from the one way or the other.
  • Fig. 2 shows an example of a receiver.
  • the oscillations which are taken up by the receiving aerial 7 are led across a tuned secondary circuit 8, detector 9, audio'frequency amplifier 10 to the indicator circuit 11, including telephone 12; the oscillations which come from the wire system 6 are led across the tuned circuit 13, detector 14, amplifiers l5 and 16, also to circuit 11.
  • a further advantage of this two way radio frequency system is that the loudness of sound is greater than that of a one way system, and furthermore it is possible to employ a smaller total energy than for wireless transmissionalone.
  • This system can, for instance, be employed when a large number of receivers get the news propagated by one wireless transmitter. If these receivers, as is mostly the case, lie with in the range of a wire system, for instance, of a central station or of a low tension lighting network, or of a telephone wire system, the transmitter can easily be connected by wire to a central point of this wire system. If the separate receivers are then also fitted with small additional apparatus for connecting them to the wire system, the general transmission of news can be carried out in the described manner according to the two way radio frequency method.
  • every receiver be connected to the wire system and also fitted with an aerial. If some receivers get only wireless news and others only news transferred over wires, the number of the subscribers which receive the news from one wireless central station can be greatly increased according to the present invention. If it is necessary to increase the energy of the transmitter for this purpose, this can easily be carried out by an additional apparatus which also may be a separate smaller transmitter for the wire system.
  • the different news can be simultaneously transmitted with the same radio frequency wave telegraphically as well as telephonically in contrast with straight wireless communication which can employ this method only with different wave lengths.
  • different wave lengths can of course also be used for the two ways.
  • this transmitter may contain two oscillating circuits, one of which is coupled to the aerial and the other to the wire system. If a transmitter provided with means for increasing the frequency is user, the wire system can be connected to one of the lower in crease stages, while the aerial is supplied by the highest frequency stage.
  • the radio frequency generator 17 supplies with energy, on the one hand, aerial 4; across a frequency transformer 18 which is fitted with two secondary windings and also across one or more further frequency transformers l9, and on the other hand, the wire system 6 across an ordinary transformer 20.
  • a special embodiment of the invention is required in case the two radio frequency waves are traversed by different waves and the same receiver is set up for receiving both waves.
  • a beat or interference reception can be carried out in this case, if the difference of the two wave lengths has a suitable value, without the receiver having a local oscillation generator.
  • the second wave can also be used for by-purposes of telegraphic communication in general as, for instance, for calling.
  • the radio frequency waves traverse distances by wire system and without wire system alternately. Either the same wave length is used which first traverses a wire system and is then transferred through a range without wire system, or the wave length is altered at the transition spot.
  • the radio frequency can be amplified or another radio frequency generated at the transition spots.
  • Fig. l shows, for instance, the scheme of an arrangement in which a larger transference distance is bridged over by means of intermediate stations.
  • News is to be transmit ted from a wireless transmitting station A across the two intermediate stations B and G to a receiving station D which is not drawn in the figure.
  • the station A has a transmitting aerial 21 in which oscillations are set up by any transmitter across the coil 22.
  • the radiated waves are taken upby the receiving aerial 23 of the relay station B and directly transferred to a wire system 25 across a suitable multi-stage radio frequency amplifier, one stage only of which being shown at 24.
  • These oscillations which are guided by the wire system are then taken up by the station (land used for exciting a separately controlled tube transmitter 26'.
  • the aerial 27 of this transmitter again radiates these Waves which finally get to the receiver D.
  • Every relay station of this arrangement can be utilized not only for the above described purpose, but also for other purposes,
  • the radio frequency can be increased at the tran sition spot at which new radio frequency energy is generated for wireless radiation, and, on the contrary, the frequency can be decreased iatit'he transitionspot from wireless transference :to that over wires.
  • a central -wireless transmitter 28 provides a series of wireless receiving stations 29 with news
  • these receivers can transfer this news to further receivers30 which lie in their spheres by means of local Wire systems, for instance, low tension lighting networks.
  • local Wire systems for instance, low tension lighting networks.
  • the stations 29 can also be fitted :with transmitting aerials in order to be able to transfer the news to those further receivers which have receiving aerials.
  • Fig. 6 showsthe converse of Fig. 5'.
  • a wire system for instance, a high tension long distance wire system, is supplied with energy by a centralstation 31.
  • This station has a radio frequency generator which supplies the Wire v system withradio frequency.
  • the radio frequency receiving stations 32 which, for instance, are arrangedin the sub-stations of the wire system, get the news and propagate it in their districts by means of aerials which, for instance, are effected by separately excited tube transmitters, so that the news can be received by the receivers 33.
  • radio frequency waves are used for the transmission of news in a wire system in which lines of a certain direction are missing, it is appropriate to connect the radio frequency generator to an aerial particularly radiating to that'direction in order also to be able to transmit news to that direction.
  • FIG. 7 A Another important embodiment of the inventon is schematically drawn in Fig. 7 A
  • directive wireless transmitter34 has a characteristic curve of the sphere of action similar to the shape of curve 35. All the receiving stations which lie in about the direction of the lines 36 then receive the news of this transmitter, but not the station 37. If this latter, however, lies within the sphere of a wire system'38 which also passes near the trans- .mitting station 34, it can also be supplied with news by this transmitter by suitably coupling transmitter and receiver to the wire system i 38. In this way such receiving stations which lie within the dead angles or dead spaces of directional transmitters can also be connected to these transmitters.
  • a communication system the combination of means for transmitting radio frequency oscillations by wireless in a directional manner to one group of stations and means for simultaneously transmitting at the same radio frequency by wire to another group of stations without the range of said directive transmission 2.
  • means for generating signal modulated electrical energy means for electro-magnetically radiating a portion of the energy so generated, and means for simultaneously transmitting over wire another portion of the signal modulated energy, the amount of energy radiated electromagnetically being greater than that transmitted over Wire and the energy sent by wire being transmitted to a locality poorly reached by the energy el'ectromagnetically radiated.
  • means for generating signal modulated undulating electrical energy means for transmitting by wire the energy so generated to'a lurality of sub-stations and means at each sub-station for simultaneously transmitting by wire and by electromagnetic wave radiation the energy received to a plurality of independent receivers, the amount of energy radiated at each sub-station being greater than the amount of energy transmitted over wire.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
US1338A 1924-01-11 1925-01-09 Radio frequency telegraphy and telephony system Expired - Lifetime US1818669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET28411D DE474643C (de) 1924-01-11 1924-01-11 Verfahren zur Hochfrequenztelegraphie und -telephonie

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US1338A Expired - Lifetime US1818669A (en) 1924-01-11 1925-01-09 Radio frequency telegraphy and telephony system

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AT (1) AT103170B (de)
DE (1) DE474643C (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023308A (en) * 1959-02-16 1962-02-27 Richard P Herzfeld Sound system for outdoor theaters
US3131351A (en) * 1961-03-29 1964-04-28 Herzfeld Outdoor theater sound system comprising a plurality of transmitters coupled to a single distribution wire
US3838343A (en) * 1973-03-15 1974-09-24 Motorola Inc Broadband cable communications system
US4761821A (en) * 1986-07-15 1988-08-02 Rca Corporation Radio frequency signal transmission system with carrier frequencies at opposite edges of the channel
US4821291A (en) * 1986-09-22 1989-04-11 Stevens John K Improvements in or relating to signal communication systems

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023308A (en) * 1959-02-16 1962-02-27 Richard P Herzfeld Sound system for outdoor theaters
US3131351A (en) * 1961-03-29 1964-04-28 Herzfeld Outdoor theater sound system comprising a plurality of transmitters coupled to a single distribution wire
US3838343A (en) * 1973-03-15 1974-09-24 Motorola Inc Broadband cable communications system
US4761821A (en) * 1986-07-15 1988-08-02 Rca Corporation Radio frequency signal transmission system with carrier frequencies at opposite edges of the channel
US4821291A (en) * 1986-09-22 1989-04-11 Stevens John K Improvements in or relating to signal communication systems

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Publication number Publication date
AT103170B (de) 1926-04-26
DE474643C (de) 1929-04-17

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