US1320685A - Badio telegraphy amd telephony - Google Patents

Description

J. H. HAMMOND, JR.

RADIO TELEGRAPHY AND TELEPHONY. APPLICATION FILED MAY 29, 1912. RENEWED DEC. 28. 1916- 1,320,685, Patented Nov. 4, 1919.

WITNESSES I v INVENTOR %7v 301m HAYS mom), an, or enoucasrm, mssacnusnrrs.

name mnnenarm AND mmenom'.

. Application filed m 29, 1912, Serial No. 700,425.

To all whom it may concern:

Be it known that I. JOHN Hays HAM- MOND, J r., a citizen of the United States, residing at Gloucester, in the State of Massa chusetts, have invented certain new and useful Improvements in Radio Telegraphy and Telephony, of which the following is a specification. g

My invention relates to improvements in simultaneous radio telegraphy and telephony, and relates more particularly to systems in which: one generator of electric waves can be used and telephone conversations can be carried on continuously," and telegraphic .messages sent at the same time without. in-

terference.

In my system, a generator of contlnuous undamped electric waves -is used, these transmitter wave lengths, the other tuned 'to the other transmittenwave length. One receiver circuit is arranged to receive only the telephone conversations; the other receiver circuit is arranged to receive both telephone conversations and telegraph signals.

7 Referring to the drawlings,-

Figure 1 shows a transmitting station on mysystem.

Fig. 2 shows a receiving station on my system. 1 In Fig. 1, an are 0 is supplied from a source of direct current M N, and produces undamped oscillatory currents in the circuit- .0 C L, of a frequency determined by the values of the inductance L and the capacity Antenna circuitA L T E is inductively coupled to L by coil L and the amplitude of the radiatedwaves is effected by the telephone transmitter T so as to transmit telephone conversation by means of the radiated waves. The telegraph key K I Specification of Letters Patent.

Patented Nov. 4,1919. Renewed December 28, 1916. Serial No. 139,419.

makes simultaneous contacts at G and H, and thus simultaneously short-circuits parts of coils L and L so that only the parts J and J of the coils remain in circuit and so that the arc. oscillatory circuit and the antenna circuit remain in tune, as they were before key K was closed. \Vhen key K is open, telephone conversations are carried on with radiated electric Waves of a specific length, and when K is closed, telephone conversations can still be carried on with waves of a different length, and at the same time telegraph signals, due to the closing and opening of ,key K, can be transmitted. Fig. 2 shows one form of receiving system constructed in accordance with this invention and comprising an open aerial cir-' cuit including an antenna B which leads through two branch circuitsL C1'andL C to a ground E. This open circuit is tuned to respond to the two high" frequencies of the transmitting system. The branch circuits L and L C are coupled respectively to two closed resonant circuits L C and L C which are tuned to respond re spectively to the two high frequencies of the transmittingsystem. Rectifier R supplies current from the circuit L C?" to one winding of the telephone receiver P Rectifier- R supplies current from'thecircuit L Cto the telephone P through the inter.v

rupter I: and R also supplies current to the telephone winding P which is onwhe same telephone recelver as P The circuits 0 C L and A L T E. of the transmitting station are in resonance with the circuit L C of the receiving station, and when the transmitting key K is open, telephone conversations only are transmitted and are received on one winding of the telephone I. The circuits 0 C J and A J T E of the transmitting station are in resonance 'Wjith the circuit L C of the receiving station, and Whenthe key K is closed. telephone conversations may continue to be transmltted-and will be received on the telephone winding P which is connected with transmitter. T, regardless of the position of.

' employed, and, in general, I do not confine myself to the specific means herein described for embodying my invention, but what I claim is: 1. In a system of simultaneous radio telegraphy and telephony, a transmitting station having closed and open oscillatory circuits,

means for changing the frequency of said circuits and maintaining said circuits in resonance with each other, means for trans-- mitting telephone messages with all wave frequencies, and means for transmitting telegraph signals at some wave frequencies, and a receiving station with a plurality of sets of open and closed receiving circuits, each set of receiving circuits being inresonance with one of the wave frequencies of the transmitting station. 3

2. In a system of simultaneous radio telegraphy and telephony, a transmitting station'having closed and open oscillatory circuits, means for changing-the frequency .of said circuits and maintaining said circuits in resonance with each other, means for transmitting telephone messages continuously, and means for transmitting telegraph messages intermittently.

.3. In system of simultaneous radio telegra'phy and telephony, a transmitting statlon having closed and open oscillatory circuitsyinductances in said oscillatory circuits,

means for simultaneously changing the amount of sald inductances, means for transmitting telephone messages with all values of said inductances, and means for transmit? ting telegraph signals with some values of said inductances. I

4. In an electric-wave transmission system, a transmitting station having closed a and open oscillatory circuits, inductances in said oscillatory circuits, means for simultane ously changing the value of said inductances, and --concurrentl v sending telegraph signals, and means for. transmitting telephone messages with all values of "the inductances. r

5. A method of simultaneous radio telegraphy and telephony which consists in changing the wave frequency of, the transmitting circuits and maintaining .them in resonance impressing telephone ,vibrations and telegraph signals upon said circuits,

continuously emitting electric Waves and re ceiving-them upon separatelystuned recelvmg clrcults.

6. A method of selective radio transmission, which consists in continuously transmitting telephone messages and intermit tently transmittingtelegraph signals, changing'the wave length of the oscillatory circnits. of the transmitting station,.and mainhaving closed and open oscillatory circuits,

means for changing the frequenc of said circuits and maintaining said circuits in resonance with each other, means for transmitting telephone-s messages continuously,

and means for transmitting telegraph mes: sages intermittently, and a I'QCBlVlllgStflt-lOll having means for receiving telephonemessages at all frequencies ofthe transmitting station. a

8. In a system of radio telegraphy and telephony, a source'of energy, a plurality-0f cooperating tuned devices arranged to be energized from sald source, means fonvwrying the tuning of-said devices at will, a te-lephone transmitter adapted to continuously impress waves corresponding to sound waves upon the waves of radiant energy emitted, and a telegraphing means intermittently op-.

erable for transmitting messages .-simul-taneously with the waves impressed bysaid transmitter. r x

9. In a system of radio telegraphy and telephony, a source of energy, a plurality of cooperating tuned devices arranged to be energized from said source, means for varying the tuning of-said devices at will, a telephone transmitter adapted to continuously impress waves corresponding to sound waves upon the waves of radiant energy emitted, a telegraphing means intermittently operable for transmitting messages simultaneously with the wavesimpressed by said telephone transmitter, and separately tuned devices for receiving the respectivetelephone and telegraph messages.

10. A radio system for simultanedusly transmitting telegraph and telephone messages, oompr-ising-means for transmittinga seriesof periodic radiant impulses having a predetermined frequency, mean including a telegraphindevice for changing the frequeue) of sai impulses from time to time at the will of an operator to a second predetermined frequency'to form telegraph messages, and means for impressing upon said impulses of both frequencies variations.

a predetermined frequency, means including a telegraphing device for changing the frequency of said impulses from time to time at the will of an operator to a second predetermined frequency to form telegraph messages, means for impressing upon said impulses of both frequencies variations corresponding to sound waves to transmit telephone messages simultaneously with said telegraph'messages, and means for receiving said telegraph and telephone mes sages including two circuits tuned to respond to' said frequencies respectively, telephonic receiving means controlled by both of said circuits fol-receiving said telephone messages, and telephonic receiving means controlled by One only of said circuits for receivin said telegraph messages.

12. A ra io system for simultaneously transmitting telegraph and telephone messages, comprising means for transmitting a series of periodic radiant impulses having a predetermined frequency, means includ ing a telegraphing device for changing the frequency of said impulses from time to time at the will of an operator to a second predetermined frequency to form telegraphic messages, means for impressing upon said impulses of both frequencies varie ations corresponding to sound waves to transmit telephone messages simultaneously with said telegraph messages, means for receiving said telegraph and telephone messages including two circuits tuned to respond to said frequencies respectively, telephonic receiving means controlled by both of said circuits for receiving said telephone messages, telephonic receiving means controlled by one only of said circuits for receiving said telegraph messages, and means cooperating with said last-mentioned circuit for impressing audible variations upon the impulses received thereby.

13. A radio system for simultaneously transmitting telegraph and telephone messages, comprising an open aerial circuit,

means for causing said circuit to emit periodic radiant impulses having a predetermined frequency, means including a telegraphic device for changing the vfrequency of said impulses to a second predetermined frequency from time to time at the will of an operator to transmit telegraph messages,

r and means for impressing upon said impulses of both frequencies variations corresponding to sound waves to transmit telephonic messages simultaneously with said telegraphic messages.

14.111 a radio system for simultaneously transmitting telegraph and telephone messages, the combination with an open aerial circuit including an inductance, of means including an inductance cooperating with said first-mentioned inductance for causing said aerial circuit to emit aseries of periodic impulses having a predetermined frequency, of means including a telegraphic device for simultaneously varying the effective lengths of said inductances to change the frequency of said impulses toa second predetermined frequency from time to time to transmit telegraphic messages, and a .telephone transmitter arranged to impress variations corresponding to sound waves upon the impulses of both of said frequencles to transmit telephone messages simultaneously with said telegraphic messages.

15. In a radio system for transmitting tele raphic and telephonic messages, the com ination with means for emitting periodic radiant impulses of a predetermined frequency, of means including a telegraph key operative to change the frequency of said impulses from time to time to a second frequency to transmit telegraphic messages,

and a telephone transmitter arranged to impress variations corresponding to sound waves upon the said impulses of both frequencies to transmit telephonic messages simultaneously with the said telegraphic messages.

16. A radio system for simultaneously V transmitting telegraphic and telephonic messages, comprising means for transmitting periodic radiant impulses having a predetermined frequency, of means including a telegraph key operable tochange the frequency of said impulses from time to time ting telegraphic and telephonic messages,

comprising means for transmitting a series of perlodio impulses having a predetermined frequency, means including a telegraphic device for changing the frequency of said impulses to a second predetermined frequency from time to time at the will of an operator to send a telegraphic'message, and means for impressing upon said impulses of both frequencies variations corresponding to sound wavesto send a telephonic message simultaneously with said telegraphic message.

18. A system for simultaneously transmitting telegraphic and telephonic messages, comprising means for transmitting a'series of periodic impulses having a predetermined frequency, means including a telegraphic device for changing the frequency of said impulses to a second predetermined frequency from time to time at the will of an operator to send a telegraphic message, means for impressing upon said lmpulses of both frequencies variations corresponding to sound waves to senda telephonic message simultanleouslly with said telegmphic message,

and means for simultaneously receiving saidtelegraphic and telephonic messages including a receiving device responsive to said impulses of both of said frequencies for receiving said telephonic message, .and adevice responsive only tosaid impulses -of said second-mentioned frequency for receiving said telegraphic message.

19.. A system for simultaneously transmitting telegraph and telephone messages, comprising mcans fortr-ansmitting a series of periodic impulses ha a predetermined 2-0. A system for simultaneously transmitting telegraph and telephone messages, comprising means for transmitting a series of periodic impulses having a predetermined frequency, means including a telegraph key for changing the frequency of said impulses from time to time to a second frequency to send a telegraphic message, a telephone transmitter arranged to modify said impulses ofbothjof saidfrequencies in accordance with sound Waves to transmit a telephone" message simultaneously with said telegraphic message, and means for simul:

I taneously receiving both of said messages ineluding a device responsive alternately to said impulses of both of saidfrequencies and :a. device responsive only to said impulses of said'second-mentim-ied frequency, said lastmentioned device including means for varying the effect .of the received impulses of said second-mentioned frequency at a rate within audibility. v

21. A method of simultaneous telegraphy and telephony, which consists in generating a series of'periodic impulses having a predetermined frequency, changing the frequency of said impulses from time to time at the will 'of an operator to transmit a radio-tele-' graphic message, and impressing upon said mpulses of all frequencies varlatlons correspending to sound Waves. to transmit" a radio telephonic message simultaneously with said telegraphic message. I

22. A method of simultaneous telegraphy [and telephony,whichconsists in generating a series of periodic impulses having a predetermined frequency, changing the frequency of said impulses from time to time at the will of an operator to transmit a radio-telegraphic message, impressing upon said lmpulses of all frequencies var ations corresponding to sound-Waves to transmit a radio-telephonic message simultaneously with-said:- telegraphic message, and selectively receiving said impulses of different:

frequencies causing a receiving device to respond to said impulsesof each of said he quencies to receive said telephonic message,

and controlling-another receiving device as aresu'l-t'of the action ofsaid impulses of one of said frequencies.

23. A method of simultaneous radio-telegraphy and telephony, which consists in generatlngaseries-ofperiodic radiant impulses having a' predetermined frequency, changing the frequency of said impulses from timeto time at the will of'an operator to transmit a radio-telegraphic message, and impressing upon said impulses of all frequencies'ivariations corresponding to sound waves t6 transmit a radio-filephonic message simultaneously with said telegraphic message.

24. A method of multaneous radio-teleg-. raphy and telephony, which consistsin gem crating a series of periodic radiant impulses having a predetermined frequency,-changing the frequency of said impulses from timeto' time at the will ofmn' iperator to transmit a radio-telegraphic message, impressing upon sa d impulses of all frequencies valuations corresponding to sound'wa-ves to transmit a radio -tejlep'h-onic message simultaneously with said telegraphic message, and. selecfrequencics causing a receivin device to-respond to said impulses of-eac of said frequencies to receive said telephonic message and controlling another receiving device as 'a'result' of the action of said impulses of one of said frequencies.

This specification signed and witnessed this 22nd day of May A, D., 191*2.

JOHN HAYS H oNn JR.

Witnesses:

MABELJ. Coornn, Omvr. B. KING.

tivel-y receiving said impulses of different

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