US1672407A - Radio broadcast distributing system - Google Patents

Radio broadcast distributing system Download PDF

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Publication number
US1672407A
US1672407A US27514A US2751425A US1672407A US 1672407 A US1672407 A US 1672407A US 27514 A US27514 A US 27514A US 2751425 A US2751425 A US 2751425A US 1672407 A US1672407 A US 1672407A
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United States
Prior art keywords
telephone
radio
station
subscribers
line
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US27514A
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English (en)
Inventor
Edward E Clement
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EDWARD F COLLADAY
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EDWARD F COLLADAY
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Priority to NL23082D priority Critical patent/NL23082C/xx
Priority claimed from US746357A external-priority patent/US1635153A/en
Application filed by EDWARD F COLLADAY filed Critical EDWARD F COLLADAY
Priority to US27514A priority patent/US1672407A/en
Priority to GB26379/25A priority patent/GB242266A/en
Priority to FR609168D priority patent/FR609168A/fr
Priority to DEC37381D priority patent/DE549657C/de
Priority to US117130A priority patent/US1635157A/en
Application granted granted Critical
Publication of US1672407A publication Critical patent/US1672407A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/21—Billing for the use of broadcast information or broadcast-related information
    • H04H60/22—Billing for the use of broadcast information or broadcast-related information per use
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/40—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
    • H04H60/93—Wired transmission systems
    • H04H60/94—Telephonic networks

Definitions

  • My invention relates to systems of radio broadcast distribution, and the present application is a division of my prior c0pending application, filed October 28, 1924: Serial No. 746,357 Patent No. 1,635,153, issued July 5, 1927.
  • This invention has for its object to provide an organization for the broadcasting of intelligence in which orderly distribution may be secured, with maximum efiiciency, and the entire service may be metered, whether local or long distance.
  • Fig. 1 is a graphical diagram showing the channels of distribution and lines of au thority and control in the system.
  • Fig. 8 is a diagram of a telephone central station with two subscribers stations connccted to it and is intended to be read with Fig. 4 is a continuation of Fig. 3, and shows a radio central station and a radio subscribers station physically connected therewith through the telephone circuits of Fig. 3.
  • Fig. 5 is a diagram showing the subscribers double detector receiving set of Fig. tdivided into two single demodulating units, one located at the subscribers station and the other located at the-central oflice, the first detector being at the subscribers station and sending long waves through the subscribers line to the second detector at central, which sends back audio waves to the subscribers telephone.
  • FIG. 6 is a circuit diagram of the same Fig. 6 is a diagram showing a further modification oi the circuit of Fig. 5, in which regeneration is added, at the subscribers sta tion, and the intermediate wave line coupling at central is included in the cord circuit.
  • Fig. 7 is a diagram of a further modification showing the said cord circuit provided with the same elements'as in Fig. 6 except the battery which is in two units, one for talking and telephone signaling, and the other for the detector tube plate circuit.
  • Fig. 8 is a diagram showing a simplified form of metered system.
  • Figs. 9, 10 and 11 show respectively the daily program despatch sheet for the master or A station, a B station in the eastern time division and a local or C station inthe same time division.
  • the station A is shown connected by lines of distribution to'district stations B, B B and B.
  • the stations B are in the eastern division, the stations B in the central division, the stations B in the mountain. division, and the stations 13* in the coast division.
  • Each of these district stations is shown connected by lines of distribution to local distributing stations C in its district, and each of these local stations is shown connected to stations I) typifying the ultimate subscribers stations.
  • the lines of distribution also repre sent telephone trunk lines from C stations to B stations.
  • D represents the subscribers equipment, like the stations B and C.
  • Fig. 1 not all the stations B are connected to station A by di rect individual trunk lines, but some district stations trunk through a district master station, thus economizing trunk lines.
  • the trunks 58, 59, and 60 in Fig. 1 are shown extending to master district; ations in the groups B B and B respectively, other B stations in these district groups being con nected to A through the respective master stations B by relatively short trunk lines 61, 62 and 63.
  • the number and routing oi. trunks so used is of course variable, and may be accommodated to the necessities oil telephone traflic so as not to interfere with the normal telephonic use oi the wire plant, which is one of the cardinal points in the design of the present system.
  • a subscribens line 18-19 extends from his station A to the central telephone exchange C which is equipped with line jacks J, connecting plugs PP and trunk jacks J From the trunk jack J shown.
  • a trunk line 50 extends to the district station B. which is also equipped with switchl'ioard terminals including plugs P"-P and trunk jacks 1 J From the jack J shown in the figure a trunk 51 extends to the master station A where it terminates on a jack J.
  • the station is equipped with plugs P P and may be fully provided with telephone switching Details of such switching equipment are shown. in Figs. 3 and 4.
  • Fig. 2 operators telephone instruments are shown at 81, 82 and 83, connected in the usual manner to the cord circuit, and these symbolize a complete signaling and supervisory system.
  • Each operator at stations B and A. also has a demodulator and receiver for long 1F waves. with suitable key for controlling the connection of the same to her cord circuits.
  • the radio equipment of station C includes a relay receiver and transmitter T with a local microphone and amplifier I for local modulation.
  • the antenna symbolized at 52 is supposed to receive waves sent out from the B station of the district in which the particular station (1 happens to be located, and to which it is connected by means 01 the trunk line 50, which of course does not symbolize all telephone trunks but only such as may be allotted for the so-called radio traftic.
  • the frequency to which the antenna circuit 52 is tuned in that allotted to the 0 stations and to which they are all normally or permanently tuned.
  • the antenna circuit 53 is for radiating modulated carrier waves to the subscribers D in the particular local area surrounding and served by the station C under consideration.
  • the frequency to which the antenna is tuned is that allotted to the subscribers D, and to which they are all normally or permanently tuned.
  • the details of the subscribers station apparatus, in cluding both telephone and radiophone are shown in Figs. 3 and 1, wherein a particular station of class D is designated as A, and will be described hereinafter.
  • Fig. 1 I have shown a microphone transmitter 64 at every station of the orders A, B. and C. to indicate that broadcasting may be originated thereat when required.
  • the actual manner in which this is now intended to be done is shown in Fig. 1.
  • the symbolic station 0 is provided with a pair of jacks J and J between which are connected the audio amplifier 65 and the intermediate frequency modulator and oscillator transmitter (56.
  • the jacks J and J may be connected through the operators cords and plugs with the line jack .l on the one hand and with either one of the jacks J or J on the other. Ii jacks J and J are plugged together and jacks J and J are plugged together, then the operation would be as follows: Assuming the till 1 presently described.
  • jacks J G and J are plugged together and jacks J 9 and J are plugged together, whereupon the carrier current or intermediate frequency carrier waves will be communicated to the input circuit of'the oscillator transmitter B and thereby modulat'ed ona high frequency carrier wave radiated from the antenna 55, at stand ard C frequency.
  • thejaelr J is' plugged ontothe jack- J of the trunk line 51, and the amplified or re layed intermediate frequency cara'er Waves as that'of the amplifierG'i at station B5
  • the jaclif J2 th amplified intermediate frequency waves will be communicated tothe input side of the-oscillator transmitter '1 and thereby inodulated on a short carrierwave and radiated from the antenna 57.
  • Wlll n'ow' be apparent, viz that the initial audio or telephone Waves may bechanged as near'as
  • VSVBS modulated intermediatefrequency carrier
  • Audiowaves in a wire circuit are subject to distortion to agreaterdegree than modulated superaudio frequency carrier. Waves.
  • the initialaudio waves are alwaysc'hanged into'modulated superaudio Waves'at the nearest central sta tion, and thence dispatched either on a carrier-wave radiatedfroni an antenna, or on a trunk wire'tosome other point where they are so dispatched.
  • theA station at the right of Figure 2 may trunk from a jack or: aclrsJ through a trunk or trunks designated as X to any other part of the system. as ior example to a particula Bstation, where the trunk X may terminate on a jack similar to J for connection toradio transmitter T. or by further trunkingto some particular C station, and so to-thera-dio transmitter T at such station, whereby matter can be picked up at'any pointand broadcast either generally or in a selected'district or in a selected local area only'.
  • crnitributors cugineering dcpartn'ient, for regulation of methods and standardizing of apparatus, to work in conjunction with telephone engineering staff; 1) operating department, in cluding routing, despatching and supervision; (5) business department, to receive and handle all matters of accounting, and in cooperation. with the telephone organization, to fix charges.
  • Figs. 3 and l have therein shown circuits of the central office and substation equipments and COI'iiiQCiliOHS, Fig. 3 representing the telephone side of the temrand Fig. 4 the radiophone side of the system.
  • [)lOVlPlOi'l is made for keeping the telephone lines and central office circuits clear of all grounds or other disturbing connections during conversation.
  • the radiophone goes into service, by closing the filament switch its operation in receiving is identical with that of any radio receiver, and .in the event that use is made of any transmission of waves over theline wires, as will be hereinafter pointed out, said transmission will be at a frequency above the limits of audition.
  • each radiophone set is provided withv a cut oil relay energized when the telephone set goes into comn'iission, either by calling or being called, and at the central. otlice whenever the radio operator takes con trol of the line, he disables it in the usual manner by pulling up the cut off relay at the telephone switchboard, this however being subject to the condition that a. special tone test may be put on the radio board, and subject to interruption for telephone conanswering plug.
  • the line relay when a subscriber takes down his receiver, the line relay lights its lamp, which is eX- tinguished when the operator inserts the Battery supply for the connected lines is thereafter taken through the cord circuit 2(l22, 9 1 23,,in a. mani'ier well understood in the art.
  • the line circuits are conductively open for direct. current, leaving the ringers Q, and Q in circuit for alternating ringing current pass ing through the condensers Referring now to Fig. l.
  • the radio switchboard which I have designated, generally by the letter R, is coniiected to the subscribers lines by mul J J corresponding to the multiple .iaclrs on the telephone switchboard.
  • the tip wires 16 and 18 with their branches are connected to ground, while the sleeve wires 17 and 19 and their branches, areconnected to battery. This is extended into the radio side of the system for the purpose of securing proper balance-between the main battery or power plant. of that side and the main battery or power plant of the telephone side of the system.
  • taps are also taken off from the telephone terminals to the radiophone terminals as indicated at 18, 19, and 19.
  • the radiophonc is shown only at one substation for sake of simplicity of illustration) .
  • the two branches i9" and 19 are taken from the sleeve orbattcry side of the line 19. and a re connected to o 'i 'iositc terminals of the winding of a relay L, which constitutes the substation cut otf relay for the radiophone'
  • the windin of this rclav is bridged by a condenser through which inter- I both ringing and voice currents can pass Without substantial impedance.
  • this relay L may be omitted, since on such party lines there are u ually grounds on one side or the other.
  • the cut oft relay L is deenergized and a consequence the wire 19 is connected through a back contact of the relay through extension wire 24 to the branch 25 connected to the A battery marked A, in F
  • the wire 18 similarly passes through a back contact ot the relay to the extension wire 26 leading totest or listening relay QT and ground. 18, itv will be remembered, leads to the tip or ground side of the line, therefore it is the side which in the radiophone can be made usev of with a pernninent ground or grounds, without disturbiiiig the balance of the telephone circuit.
  • the ratliophonereceiver at the substation A is shown as comprising an antenna 28,
  • the filament battery is A
  • the plate battery is B, and suitable tuning condensers and coils, tickler coil for regenerativeetl'ects, etc., are provided as-required. I should remark in passing that this representation of the radio receiver is intended to be typical only.
  • the relay L has four pairs of contacts, one pair 27* closing the wires 25 and 37 from battery A, to the filaments.
  • the second pair 27' closes the wires 25 and 38 was to put battery A, on the telephone transmitter T. and through the induction coil 1, to ground.
  • the third and fourth pairs oft contacts 27 27, close the wires 39 and 40, forming terminals of the secondary induct-ion coil circuit 1, to the tip and sleeve side of the telephone line respectively, through the back contacts of relay L
  • Tue transmitter T is shown hanging upon a hook switch H controlling the connection of wires 41 and 42, constituting a parallel link between the battery A, and the filament bus 43.
  • the former is controlled by the radio operator at centrahand the latter by the subscriber at the substation.
  • T represents a broadcasting transmitter, symbolized in very simple form, but supposed to contain the usual elements of power supply, modulator, oscilla tor and aerial, with suitable amplification of the, audio ,waves supplied on the input side.
  • the jack J connected to the amplifier 25 and thence to the transmitter T, symbolizes a group of such jacks or equivalent connecting means such as automatic switches, controlled by dials or keys for connecting any of the wire lines to said radio transmitter.
  • Detailed appliances, both for the switching and for the radio transmission, are well known in the art.
  • my present invention having to do particularly with the method of transmitting by Wave radiation to the substations, and of bringing in all conversation originating or received at the substation radiophone'over the subscribers Wire line. This includes repetition of modulated radio waves received at the radiophone substation and also originating messages gathered up and to be put through the amplifier t on the transmitting T for broadcasting.
  • the cord circuit between plugs P and P in Fig. 4 is the same as the operators cord circuit in Fig. 2, but the radio operator also hasspecial test cords such as that shown in the upper part of the ligureconnected to plug P.
  • the keys KK are of stand ard construction, as in the other cords, and the test contact of the plug P" is connected through.
  • the constant connection of the sleeve or battery wire 24 at the radiophone substation to the bus wire 25 of the battery A produces charging of that battery by the constant flow of current therethrough from the main radio battery E at the central ,oflice.
  • the amount of energy thus delivered to the battery A depends uponthe size of the line wires, and the length of time available for such charging.
  • the. battery wire 24 is not cut oil except when the cut oli relay L pulls up which is only when the line wire is in use for conversation.
  • Figs. 3 and 4 it has been assumed that the subscriber would employ apparatus for demodulating double modulated carrier Waves, including two detector tubes, the first of which takes off the intermediate frequency carrier waves upon which the audio modulations are imposed; and the second of which takes 011' the audio frequency modula- It is desirable to lessen the amount of apparatus at the subscribers station, and at the same time give the central office operators an opportunity to supervise by listening in on any message being received, and to meter the service in simple and efficient manner. For these purposes, I have shown in Figs.
  • the subscribers station A is equipped with a radiophone re DCving device including an antenna circuit 28, tuned as usual, and coupled by means of coils 29 to the input side or grid circuit 125126 of the detector tube 85.
  • the in put circuit may be tuned by means of condenser 129, but it is to be understood that this condenser and also the tuning elements in the antenna circuit may be adjusted once for all if the subscribers all work on a constant frequency, as hereinbefore set fortl'i.
  • the plate circuit 127-128 of the tube includes one winding 128 of a tuned filter coupler, the other side of which 121 is connected to extensions 18 and 19 of ti subscribers telephone line circuit 18-19.
  • the coil 123 is shunted by a condenser 12 1, and the capacity and inductance are so adjusted that the short circuit thus formed is resonant to the intermediate frequency Wa ves imposed on the short carrier Waves reaching the sub scribers instrument through the antenna 28.
  • the variable condenser 122 is included in series with the coil 121, because of the line connection, tuning of the line being accomplished at both ends as will presentl appear.
  • the line wires 18*19 are connected to any desired number of answering and multiple jacks typified bv the single jack J, and is provided with extensions 1819 passing to the radio department or radio switchboard R in the upper in Fig. 3, are intended to be interconnected with other jacks for telephonic purposes through a standard cord circuit 2021, 22-23, having terminal plugs P P, and bridged by a common talking and signaling battery B, feeding through the two halves of repeating coil I and also feeding through a ring on each plug and test thimble on each jack to the cut oii relaycircuit 19*, so that whenever a plug is in a jack of the line 18-19, circuit from battery.
  • supervisory lamp signals ss, adapted to be shunted by contact.-. controlled by supervisory relays cluded in the conductors 22-23, respectively. These relays respond to current in the subscribers lines when they are interconnected. and the lamps light When the subscribere hangup their receivers.
  • jacks typified by jacks JJ As shown, these are in pairs, for convenience only, and to avoid putting a large-number of contacts in one jack.
  • the upper jack J is a duplicate of the telephone jack J, and has its contacts connected in parallel to the same conductors, respectively.
  • Jack J is a radio jack pure and simple, and is connected to the same line wires 1819 through a tuned filter coupler composed of coils 115 and 117 and con denser-s 116 and 118.
  • the elements 115 and 116 are employed in conjunction With the elements 121 122 at the subscribers station to tune the line circuit to resonance at the frequency of the long waves sent forward as demodulated by the subscriber.
  • the ele ments 116117 at central are included in this figure between the line and the jack because by this means the t'uning of the line can be made constant and adjusted once for all.
  • the cord circuit adapted to. cooperate with these twin jacks has corresponding twin plugs P 'li preferably connected mechanically so they can be inserted and re moved from'the jacks at the same time.
  • the plug P is the terminal of a standard talking circuit -91, with battery B bridged across it through coils 929 3, and provided with supervisory lamp 101, the controlling shunt therefor 102, the supervisory r lay 103 and the talking shunt there for 104;, also with special test coil 106 sup plied with a radio tone test through wire 108 from the commutator 107. hen this plus; is inserted in the jack J the cut off relay L of the telephone line is pulled up and the line cleared from all telephone switchboard connection, for radio use.
  • the plug P forms the terminal of a ra-v dio detector circuit, the tip and sleeve of the plug being connect-ed through conductors 9697 with the. grid and the filament respectively of the detector tube 86.
  • circuit 9798 of this tube isconnected to the outside terminals of coils 9 1-95 which with the bridged coil 92-93 form the usual repeating coil connection between two.
  • Fig. 6 I have shown therein a modification of the circuit of Fig. 5, in which the following features are introduced: First, I provide a feed back coil or tickler 130 at the subscribers station: a special receiving telephone 1.33 with a terminal plug 132 adapted to be inserted in the jack 131 bridged across the telephone line outside of the filter coupler 121-123; and lastly I have removed the central otlice lil ter coupler 115117 from its position be tween the line and the jack J as in Fig. and instead thereof have located this coupler in a bridge of the cord circuit 96 9'7. thus doing away with the twin plug P and its connections.
  • an' ordinary telephone si'vitchboard may be used for radio purposes without any change otherthan adding the filter coupler, the detector tube, and other connections to an ordinary standard answering plug cord.
  • This interchangeability of the parts makes it possible to give radio service on any telephone switchboard, using the same opera-- tors if desired, for both services. It also makes it possible to lengthen the life of a telephone switchboard, by rewiring the cords and converting it into a radio switch board.
  • the antenna circuit 28 and the coupler 29 are the same as before; the grid circuit is 125-126, the plate circuit 1272-128 includes a tickler coil 130, and the other parts have been referred to.
  • the plug P is connected in Fig. 5 to the repeating coil, battery, supervisory lamp, controlling relay therefor, tone test,
  • the coil 115 of the central office filter coupler is bridged across the terminals of the plug, with its tuning condenser 116
  • the twin member of the filter coupler 117, with its shunting tuning condenser 118, is bridged through conductors 9697 across the grid circuit terminals of the tube 85.
  • the plate circuit 9T98 is connected to the repeating .coil in the cord, and in this case also includes a ti'ckler coil 134:, which maybe cutin and out of the plate circuit at will bymeans of a switch 98. feeds back into the grid circuit waves at intermediate frequency, as received over the line, and is intended to give a'higherratio of amplification in the audio current returnedto the subscriber than would be possible without it. It should be noted however, that instead of thus using the regenerative principle,I contemplate employing radio and audio amplification in one or more stages of each, inserted between'the detector tube '86'and the plug P or P (Fig. 5).
  • Fig. 7 I have shown a modification of the cord, circuit in Fig. 6, which consists in providing a separate battery B forthe plate circuit 97-418 of the tube. This battery is located exit to the plate, and the by-pass condenser 100 is bridged across the terminals of the repeating coils 9l95. This appreaches more nearly to the common or standard method of connecting circuits than the bridge circuit of Figs. 56, and while probably not more eflicient, is a little more flexible, as it permits thevoltage of the B This coil battery to be varied at will, without reference to the voltage of the battery B which according to telephone practice is constant at about 22 volts.
  • Figs. 6 and 7 The operation of Figs. 6 and 7 is as'tollows: The subscriber may call as before and in re sponse to his call the radio operator gives him a. cord circuit with terminal plu P or P, whereupon his unit through the detector tube 85 demodulates the short wave carrier received on antenna circuit 28, and sends the intermediate or long wave modulation thereof through the line wires to central, where it passes to the jack J and the plug P and is repeated by the tuned filter coupler 115- 117 into the grid circuit 96-97 of the tube 86.
  • the audio modulations are first detected and then amplified and sent back through the repeating coil to the plug P and the jack J to the subscribers line.
  • the subscribers station they are received either on his regular telephone receiver, or on the special telephone 133 which typifies any kind of receiver which it may be found expedient and desirable to employ.
  • Figs. 5, 6, 7, l have not shown any amplification, but it is to be understood that any desired amount of amplification may be added between the detector tube Stl nd the repeatin coils 9 l95. Such amplification may be o'lt any known or suitable type, and needs no illustration.
  • the cord circuits shown in Figs. 5, 6, 7'however, with or without amplification, and thus adapted to give different classes of service, may be divided into groups, for which the subscriber should be charged different rates, as in long distance telephone service. It is very necessary that there be metering upon which to base the charges, since the service a time service and not a message service. For this purpose I. contemplate including in each cord a meter actuator such as g in Fig.
  • the No. 1 cord circuit may be connected to a commutator that closes the line meter circult once every hour;
  • No. 2 may have a meter actuator that works twice every hour;
  • No. 3 may have an actuator that works three times in the hour; while
  • No. t may have its actuator work every ten or twelve minutes.
  • the reason for s-i'elccting these time divisions is that the average charge per message for telephone service is about five cents. At five cents per hour,'and averaging three hours service per day, a subscribers radio bill would be $4.50 per month.
  • a subscriber (which term is meant to include any v..er) may not keep his radiophone in "e a full hour, a pertinent example being that of a man who desires to obtain a baseball score or other special information.
  • a special provision should be made for registering such service, as it involves all the elements of expense to the operating com pany which would be included in a much longer connection.
  • the operator may have a push button 9 connecting the actuating generator G direct to the meter circuit through'the plug P as shown in one form in Fig.
  • the automatic actuating means for the meter comprising the commutator g which at stated intervals connects the generator G to the wire 297 leading to the third contact on the plug P which when the plug is inserted in jack J completes the circuit from wire 297 through wire 298 to the cut off relay wire 19, thence to the high winding 299 oi? the meter LM.
  • the meter is shown as the ordinary standard telephone line meter, which would thus serve a double purpose, registering both the telephone calls and also the time of radiophone use in terms of telephone call units or telephone message units.
  • Sucha meter by reason of the high resistance in its winding 299 will not re spond to the battery current which energizes the cut oflf relay L, but when the operator connects a generator as G producing current of higher voltage, then the meter magnet becomes sufliciently energized to attract its arn'iature and close the circuit of its low winding 300, the rush of current through the low winding producing strong and cer-. tain actuation of the meter countingdevice 301.
  • Fig. 8 The system shown in Fig. 8 is the same as that ofFigQh but simplified by omitting the. radio broadcast distributing switchbo a-rd,.'giving the subscrioer a simple radio receiving set of the single tube regenerative type and giving the telephone switchboard operator control of the metering of broadcast. service.
  • the subscribers broadcast receivin 7 D set consists of a single tube radio receiving set BS of standard type with a set of head phones HT, and with no physical connection with the telephone line, but located at the substation A for use by the subscriber thereat.
  • the subscribers substation telephone apparatus-and its line terminal apparatusL J, etc. are the same as that of Fig. except that the multiples 18 19 and 19* extend only to other telephone multiple switchboard jacks, not shown, according to usual' telephone practice.
  • TM is a telephone service metering key for actuating the line meter Lh/I without actuating the cord circuit meter PM, the meter PM being used in this arrangement to rec- 0rd the use of the cord circuit for broadcast service.
  • This use of the plug in connection with broadcast service consists in the connection of asubscribers line, such 18-19 of the substation A, through the cord circuit 2021, 22-23 to a program announcement jack PJ conected with the program bus PB which is supplied continuously with telephonic announcements of program items available to the subscribers at their radio receivingsets Winch announcements carry with them the proper instructions for tuning the: subscribers instrument.
  • the station A can either broadcast direct or by wire trunking through the B stations, preferably the head B station of each division. It is further to be noted that the A station When so working over wire trunks can receive the same Waves radiated from B or antenna 56 (Fig. l) and by demodulating and the listening to the audio frequency com.- ponent thereof can determine the eiiiciency of transmission and the tuning of the B apparatuswith respect to the short carrier Wave employed.
  • Each station B is supposed to be a district station, that is, it compiles and checks up all bookings or regular number items in its district, keeps the A station informed thereof, makes up district programs, superlocal or C programs including items to be recorded and released later, receives, records and forwards traffic reports and charges from its district to A and acts. as a relay station for mixed Wire and radio transmission between the C stations in its district and the rest of the system.
  • the relationof the B and C stations to each other and their operation will be better understood after an explanation of the last sheet of drawing herein, containing Figs. 9, and 11, as well as a statement of the manner of employing primary and intermediate frequencies for distribution without interference. First, however, the functions of the C stations should be fully understood.
  • each radio exchange C includes the following: Relay broadcasting on the subscribers or D carrier wave frequency of program items originating at B or A stations; selection of items and arrangement of local progran'is to include approved local items if any; listening in and supervising reception by subscribers, using the wire lines for this purpose; connecting subscribers wires or studio wires to trunk lines for direct communication or preferably through amplifier modulator and transmitter units and 66, for superaudio carrier current transmission over trunk lines 50 or to local broadcasting transmitters T as indicated in Fig.
  • the operation of C would be regulated according to 'ly dispatch sheets of the A and B statirms, (st-e Figs. 9 and 10) and the num ber of primary or intermediate frequencies avaiiahle, which will be presently explained.
  • the radio station C Dittllts' use the apparatus shown in Fig. 1, wii relay the waves radiated from the trans mitting station ma y be caused to return after demodulation over the wires so as to be audible to the operator through a proper listenq apparatus.
  • the apparatus of Fig. 4 also a elements such V, P etc., for test-Inglhe subscribers line and instrument.
  • radio subscribers can be handled by the radio switchboard, without access to the telephone switchboard or the telephone operators, (except in cases where the same switchboard is employed for both classes of service )j I believe this to b original with me and shall claim. the same accordingly.
  • the typical and preferred mooe of trunking by wire in this system is by means of modulated superaudio frequency carrier current which can be interchangeably in'iposed on the wired circuits upon suitable radio frequency carrier waves so as to render transn'iission and oi the mixed s3 stem both simple and flexible. This is accomplished; by first of all modulating the seconda'y intermediate frequ-ncy in accordance i i h the sounds which it desired to transmit;and' then sending this modu circ are appropriately tuned. as indicated in 5,6 and 7.
  • the carrier currents may be relayed and amplified and may be passed through filter circuits when required, all according to principles which are well understood in t, and which have not been illustrated as they form no part of the present inw-ition.
  • Tiltifj for example, in assuming s. nnection from the head B stations in ig. l to the master station A, it
  • modulated intermediate carriers may be forwarded either by means of Wires or by means of double modulated carrier Waves, from any point in the system to any othercpoint in the system, without losses or distortion due: to changes in frequency or tuning.
  • the instruments atsubscribers stations are all sup posed to be standardized and tuned to one lined frequency. (This of course is subject to'distribution of carrier Wave frequencies as expediency may determine and as recommended by the Government. For general purposes it may be assumed here that all subscribers instruments are tuned fixedly for the same primary carrier wave frequency.) Inpassing through the relay stations however, the primary carrier wave, fre quencies, change from A to. B, from B to C, and from C to subscribers D.
  • bookings may be divided into several classes, as for example: (a) permanent attractions, including artists and musical organizations of established standing, lecturers, etc. These have permanent numbers on all the dockets of the A, B and C stations, and can be used in forming permanent programs days, weeks or months ahead. (6) temporary attractions, due to public notoriety, or some other interest. These get star numbers on all dockets, and according to their rank, of national, district or local, they are inserted on programs by A, B or C stations, respectively. (0) news items, and other purely ephemeral matters of interest only at the moment, which are not carried on the dockets, except as blanks to be filled, which blan is however may be given regular numbers for convenience in wire communications.
  • this counting instrument By providing this counting instrument with a stepping magnet included in the radio battery circuit from central, a momentary break in the line made simultaneously with the closure of the line meter at the radio switchboard would actuate the subscribers meter so that itwould show the timeuse of his radiophone, in telephone message units.
  • Another method is to apply the counting meter to the sub scribers telephone instrument. instead'ot the radiophone so that it will record his telephone calls in exactly the same manner as the line meter at the central station. To do this. the meter must register additional units for messages exceeding .the three minute or other minimum length of time. which is now quite generally fixed in exchanges throughout the country.
  • One way of accomplishing this is to make the operators key in the tele phone cord circuit of the subscribers answer-- ing operator.
  • Parallel means for metering the total station load may be in the form-ofa Bristol recording time sheet, taken from a station meter connected. in the main bus circuits so as to record the total current consumption for thestation.
  • I propose to use this principle for a check against the message meter record in effecting settlement between the radio administration and the telephone administration in this system.
  • Telephone use may be ascertained by position meters. :as above stated, and is recorded in message units each equivalent to one three minute conversation. Radio time use might be separately recorded in this'way, using a position meter, or a meter of the type LM for each cord or connective circuit on the radio switchboard.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
US27514A 1924-10-28 1925-05-02 Radio broadcast distributing system Expired - Lifetime US1672407A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL23082D NL23082C (de) 1924-10-28
US27514A US1672407A (en) 1924-10-28 1925-05-02 Radio broadcast distributing system
GB26379/25A GB242266A (en) 1924-10-28 1925-10-21 Systems of radio broadcast distribution
FR609168D FR609168A (fr) 1924-10-28 1925-10-26 Système de communication radiotéléphonique
DEC37381D DE549657C (de) 1924-10-28 1925-10-29 Verfahren zur Rundfunkverbreitung
US117130A US1635157A (en) 1924-10-28 1926-06-19 Radio broadcast distributing system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US746357A US1635153A (en) 1924-10-28 1924-10-28 Subdivided service system of radio broadcast distribution
US27514A US1672407A (en) 1924-10-28 1925-05-02 Radio broadcast distributing system

Publications (1)

Publication Number Publication Date
US1672407A true US1672407A (en) 1928-06-05

Family

ID=26702566

Family Applications (1)

Application Number Title Priority Date Filing Date
US27514A Expired - Lifetime US1672407A (en) 1924-10-28 1925-05-02 Radio broadcast distributing system

Country Status (5)

Country Link
US (1) US1672407A (de)
DE (1) DE549657C (de)
FR (1) FR609168A (de)
GB (1) GB242266A (de)
NL (1) NL23082C (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2805420A1 (de) * 1978-02-09 1979-08-16 Bosch Gmbh Robert Funksystem zur uebermittlung von nachrichten

Also Published As

Publication number Publication date
FR609168A (fr) 1926-08-10
NL23082C (de)
GB242266A (en) 1927-01-21
DE549657C (de) 1932-04-29

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