US1642173A

US1642173A - Radio signaling system

Info

Publication number: US1642173A
Application number: US540451A
Authority: US
Inventors: Joseph-Round Henry
Original assignee: RCA Corp
Current assignee: RCA Corp
Priority date: 1921-03-16
Filing date: 1922-03-02
Publication date: 1927-09-13
Anticipated expiration: 1944-09-13

Description

Sgpt. 13, 1927'.

H. J. ROUND RADIO SIGNALING SYSTEM Filed March 2, 1922 K and rem/der- I I I I avwewtoz v HENRY J- ROUND m in am there is no potential difl'erence between'the.

e-raent sescifs'1921. I 1, 4 73 UNITE STATES PATENT," ppm-cs. v

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w ,mro' storms; I Application fled larch 2, 19, Serial Io. 546,451, and in Great Iarchl8, 11. v

This invention relates to improvements in the grid of the valve is. varied andis made the reception of continuous wave wireless to cause the necessary variation in the' tune signals. s 'of the main beat circuit which is connected I In some methods now in use in 'the beat to the receivers so as to maintain it in tune receptionof signals it is customary to emwiththeprevailing f-r' uericy. y

ploy circuits very accurately tuned to the In caseswhere thev eterodyne is to be beat note which of course requires great convaried so as to give a constant-beat note stancy in the length of the transmitted with the signals in spite of variations of Y waves. It is, hoTvever, .very diflicult to frequencyof the latter, I preferably employ 10 maintain absolute constancy, vtWO heterodynes 0110 Of ,COIiStllllt The object of this 'nvention is to provide and the other'variable'andof difierent fre amethod of and means for receiving conquency from the first. I a .5 tinuous waves in which even with ver ac- Beat currents due to the constant heterof curately tuned circuits reception shall not dyne and the signals are conveyed to the two be impaired by slight variations in the length oscillator circ'uits as before so that when of the incoming waves. the hen 1 of the signal wave variesa dif- According to this invention Iso arrange ferentia efiect is'produced by these circuits the receiving'apparatus that when a variaand the valve -,a.ltersthe frequency of the tion occurs in the length of the incoming variable heterodyne-and so *is arranged to waves a corresponding variation is made keep constant thebeatnote which is due to either in the tune of the receiving circuit it and thesignals and which is conveyed to which is normally tuned to the normal beat the receivin circui I frequency, or else in the frequency of the- Although have illustrated and described r I heterodyne. my invention in connection fwith the usual 25 With this object I preferably provide two radio receiving antenna system it is obvious subsidiary. oscillatory1circuits,"one tuned to thatit can be used equally well in these a frequency slightly greater than the norcalled fwired wireless systems or in conmal beat frequency, and the other tov a fre nection with any other devices which gde I quency slightly less than the. normal beat pend for. their operation on the transmisfrequency, and I apply beatcurrents to sion of signals by hi h frequency waves. A, these two circuits which are "connected -'The word wireless as erein used 1$,'th1- through rectifiers to condensers shunted fore, to be construed 'as including these with resistances. The latter are arrang in analogous systems as well the moreusual series .but'in such a manner-that normally. "tygeofradio signaling systems.

. Iyinvention is illustrated by the accomfree terminals which are connectedttothe panying' drawings,Figure '1 of which is a grid and filament of'a yalve preferably diagrammaticrepresentation of an arrangethrough an adjusting potentiometer. The ment wherebythe tune of the receiving'ciralteration of the resistance of this valve guit is corrected while Figure '2 shows an when the beat frequency ehan es is caused arrangement whereby the frequency of the to afiect either the tune of' t 'ereceiving heterodyne is corrected. circuit or the frequency of the heterodyne. In Figural, A is a circuit in which -flow In some cases, however, I may: employ only 'beat currents of a frequency,v N due to the onesubsidiary circuit to alter the-resistance incoming signals and to a heterodyne, B is a ofthe valve. I circuit accurately tuned'to thisifrequency In cases where the tune of the receiving and coupled to the circuit A. -'C,-D are.two

. circuit is to be corrected when the beat fre circuits also l-coupled to' liecircuit and quency varies owing 'to the slight variation tuned the one toa frequency N+n and-the in the frequency of the incoming waves, one other toa frequency N-m, "n. being the of the two subsidiary beat'ci'rcuits becomes amount of the variation of the beat. fre-Q more nearly in tune with the beat frequency quency from the normal which can occun r' WhlCll'lS prevailing at the moment than is for' which -1t 1's desrred to make rovision. the other and consequently'the potential at! Thcircults C and D are connec through 7' rents due to the. incoming signalsand hetero rectifiers E, E, to condensers'F, F, shunted;

by resistances G, G. These resistances are connected together and the rectifiers are ar-= of circuit B which is also coupled to a circuit K leading to an amplifier and recorder.

When the currents in circuit A have the bination'of a tuned circuit, a second circuit comprising a pair ofoppositely detunedportions electrically balanced for a certain fre-- frequency N there is no potential difference between the free ends of the resistances G, G, so that the currents in circuits C, ,D, have no effect upon the resistance of the valve. The beat currents are therefore transmitted by the circuit B totheamplifier and recorder. Should, however, the frequency of the beat currents in circuit A change it be-" comes'more nearly equal to the tune 0150 or D. There is therefore set upa potential difference between the free ends of the two resistances In consequence the resistance of the valve is changed and owing to the action of inductance J the inductance of circuit B will be changed and the circuit will remain in tune with the currents in circuit A.

In the arrangement shown in Figure there are two heterodynes L, M. The normal frequency of L is such as to produce beat currents of a frequency 'N to which the circuit B is tuned, while the frequencyof M is such as to produce with incoming Sig-- nals of the normal frequency beat currents of a frequency N and the circuits C, D are tuned to frequencies N +'n,'and N"t respectively. In the'anode circuit'of the valve I are connected a battery 0 and a coil P having an iron core provided with a second winding Q in the oscillatory circuit R coupled to the aerial S. So long as the frequency of the incoming signals is normal there is no potential difference between circuits C and D and therefore the beat curdyne M havethe frequency N. These currents produce no potential difference between the free ends of the resistances G, G.

' Should, however, the frequency of'the incoming signals vary; the beat currents due to them and M will become more nearl in tune with either C or D; Consequent y a potential difference will be set up between the free'ends of the resistances. This will change the potential of the grid of the valve and]. the ma 'etizing through 'coil P will change the lnductance of winding Q and therefore vary the frequency of heterodyne L to restore the frequency N in circuit at.

, Having described my invention, what I claim is:

1. In a wireless receiving system, the comfirst mentioned circuit for bination of a tuned circuit, a-second circuit comprisin a pair of portions electrically balanced fer a certain frequency and. unbal; anced' at nearby frequencies, and a relay cooperating with the second circuitadapted to v chan e the tuningof the first circuit. v 2. -n a wireless receiving system, the'combination of a tuned'circuit, a second electrically'continuous circuit comprising a air of oppositely detuned portions and a re ay 00- operatin with said portions, adapted to change the tuning of the first circuit.

3. Int wireless receiving system, the comquency and a' vacuum tube cooperating with saidportions having its output circuit electrically coupled to the first circuit and adapted to change the tuning thereof.

4, In a wireless receiving system, the combinationof a tuned circuit, a second .circuit' a v .rtrically coupled to said first mentioned circuit and adapted. to change the tuning,

thereof. p

5. In a Wireless receivlng system, the com-, bination of a tuned clrcuit, and a second c1 rcuit comprising a pair of oppositely detuned oscillationcircuits, a rectifier for each of said" oscillation circuits-fa resistance connected to each of said oscillation circuits, and a valve having its input circuit respo'n- I sive to. the relative potential drops' across said resistances and having its output circuit coupled to an inductance of the first mentioned circuit for varying the tuning thereof. I '6. In a wireless receiving system, the'combination of a tuned circuit, a second circuit comprising a pair of op ositely. detuned oscillation circuits, means or rectifying the currents of. the last mentioned circuits, a resistance and a capacity in parallel to each of said last mentioned circuits, and a valve having its input circuit connected to said re-' sistances and adapted to respond to their relative potential dropsand having its output circuit coupled'to an inductance of the varying the tuning thereof. :9 7. In a wireless receiving system, a receiving circuit andmeans. including a vacuum valve and associated circuits responsive to changes in the Carrier frequency, said valve having. its output circuit electrically coupled to said first-mentioned circuit where by an alteration in the carrier Wave frequency of the incoming signals is caused to vary the tune ofsaid first mentioned circuit.

s. Ina wireless miiing system, the 'combination of a tuned receiving circuit, "secportions electrical 0nd receiving circuit comprising a pair of requency and un alanced at nearby frequencies-and a vacuum relay tube relay coogerating with the second receiving circuit a apted to change the'tuning of the first cir cuit. u

9. In a wireless receiving system, the combination of a tuned receiving circuit, a sec- 0nd electrically continuous receiving circuitcomprising a pair of oppositely detuned ortions and a vacuum tube relay coo 'ra't- 10. In, a wireless rec v1ng|' system, the

" combination of atuned receiving circuitfla second receiving circuit comprising a pair of oppositely detuned portionslelectrically ceiving circuit and means including a vacbalanced for a certain frequency and a vacuum tube cooperating with said portions" ,having' its output circuit electrically coupled to the first receiving circuit and adapted 'to change the tuning thereof.

11. In' a wireless receiving system, the combination of a tuned receivin circuit, a second receiving circuit comprising a pair of oppositel detuned portions balanced for a certain tions so as torespond to said unbalancing and'its output circuit electrically coupled to 12. In a wireess receiving system, thecombination of a tuned receiving circuit, a second-receiving circuit comprising a pa r of oppositel detuned oscillation circuit-s,- a rectifier an a resistance connected to each of the last mentioned. circuits, and a' valve having its input circuit responsive to the ances an relative (potential drops across said resisthaving its output circuit coupled to an inductance of the first mentioned receiving circuit for varying the tuning there- I In a wireless receiving system, the '50 receiving circuit for varying the tuning.

thereof. I e.

14. In a wireless receiving system, the

. 'cpmbination of a heterodyne receiving cirbalanced fora certain =.the normal beat. frequency. an

requency and unbalanced for other frequencies, and avacuum valve. hav-. ing its input circuit-connectedto, said por lwave signalsil'which consists in 'applyin a tuned oscillation circuits,

cuit, a. receiving circuit normally tuned to :the normal beat. frequenc athird receiving circuit unresponsive or si als giving to alteration in frequency and means for causmgthe third'circuit to vary the tuning of the beat frequency circuit.

responsive I 15.-In -a wireless receiving system, the

combination of a heterodyne receiving cir-. ciiit, a receiving circuit normally t'uned to the normal beat frequency, a third receive ing c1rcuit comprising a pair ofcircuits op-, 1

positely detuned from said beat frequency,

said third circuit being balanced for said,-

beat frequenc and responsive to nearbyfrequencies, an 'means' or causing. the third circuit to vary the'tuning of the beat freuency circuit in response to alterations of t e normal beat frequency.

16. In a wireless receiving system, a remini valveand associated circuits responsive to changes in the carrier frequency, said valve having its' out ut circuit electrically coupled to said rst-mentioned circuit whereby an alteration in the carrier wave frequency of theiincoming' signals is' caused to vary the potential. of the grid of-said the tune of the receivvalvei which controls ing circuit. I a

17. In 'a wireless receiving system, the combination of a tuned circuit, two subsidiary oscillatory circuits, neans for applying beat currents to these three circuits, a valve,

continuous loo dyne thereto and causin a variation in the beat currents so produce due to a'change in the frequency of the incoming waves to alter v the tune ofa'receiving circuit. V

19. The,method of receiving continuous heterodyne t ereto to produce a beat requency andcausing a change in the irequency of the incoming waves to alter the tuning of the-.beat frequency circuit.

20. The method of receiving continuous .wave signals with a three electrode valve and a. beat frequency circuit which consists in heterodyning the signal to produce a beat fr' uency, causing a change in the frequency A of t e incoming waves to afiect the otential of the grid of the valve whereb t e plate currents bf the valve are altere and cau's-' ing the plate, currents to react uponthe beat frequencycircuit to affect its tuning;

21. The method of receiving continuouswave signals with athree electrode valve and a circuit which consists in heterodyning 22.1 111 wireless receiving system a rethe signals, causing a variation in the beat ceiving circuit, means for heterodyning inv currents so produced due to a change in the coming waves and means includinga. vacuum frequenc of the waves to afieet the potenvalve responsive tochan es in frequency for 10 tial of t e grid of the valve and causing changing thetu'ning of t ereceiving circuit 5 such alteration in potential to affect-the tune on a. change in frequency of either the inof said circuit. Y coming waves or the heterodyningi means. HENRY JOSEPH ROUND.