US1942561A - Radio signaling system - Google Patents
Radio signaling system Download PDFInfo
- Publication number
- US1942561A US1942561A US314885A US31488528A US1942561A US 1942561 A US1942561 A US 1942561A US 314885 A US314885 A US 314885A US 31488528 A US31488528 A US 31488528A US 1942561 A US1942561 A US 1942561A
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- US
- United States
- Prior art keywords
- carrier
- frequency
- cycles
- signals
- frequencies
- 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
Links
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- 238000010168 coupling process Methods 0.000 description 4
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- 238000005562 fading Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- LTXREWYXXSTFRX-QGZVFWFLSA-N Linagliptin Chemical compound N=1C=2N(C)C(=O)N(CC=3N=C4C=CC=CC4=C(C)N=3)C(=O)C=2N(CC#CC)C=1N1CCC[C@@H](N)C1 LTXREWYXXSTFRX-QGZVFWFLSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
Definitions
- This invention relates to radio andthe like high frequency receiving systems, and more particularly to multiple heterodyne ,receivers-i e. receivers incorporating a plurality of heterodynes-suitable for use in receiving continuous waves modulated at a plurality of frequencies or frequency ranges or any combination thereof for the purpose of providing a plurality of communication channels.
- a multiple heterodyne receiver comprises aplurality of heterodynes whereby, for correct reception, the same frequency is obtained at different parts of the receiver, means for feeding the said frequencies into a common control circuit, and means for adjusting one or more of said heterodynes, whereby azero or nil beat may be obtained in said common control circuit.
- Fig. 1 shows schematically one form of receiver suitable for use to receive a carrier Wave modulated by three different signals, two of the modulations being telegraph modulations, and the third a telephone modulation; and,
- FIG. 2 illustrates coupling apparatus utilized in Fig. 1;
- Fig. 3 is a modification of the receiver illustrated in Fig. l.
- Fig. 1 of the accompanying drawings allA the frequencies are received upon an aerial lN and passed through a sharply tuned high frequency circuit T Whose cut-off is such that any wave whose frequency is more than 180,000 cycles greater than the carrier frequency (20,000, kilocycles) is eliminated.
- the modulated carrier from the output side of the tuned circuit is now changed to a modulated carrier of,180,000 cycles, by Vmeans of a firstv heterodyne H1, supplying 19,820 kilocycles, and modulated -valves Ml,- .the new modulat-ed carrier.
- A1 having a sharp loWerfcut-oif at 170,000 cycles, and a sharp upper cut-off at 190,000cycles, 'and so designed as to avoid anyrectification.
- the last stage of this amplier comprises coupling valves CVl, CVZ, Whose grid-anode capacities are Very carefully neutralized, and which are associated with sharply tuned circuits, Whereby the band of frequencies occupied by the telephone channel (which band lies in the middle of the whole band of the amplifier) is separated out from the said Whole band of the amplifier.
- FIG. 2 This frequency selective apparatus is illustrated in conventional diagrammatic form in Fig. 2 of the drawings which is self-explanatory.
- A represents the output of cut-off A.
- B represents the output of CVZ (Fig. 1)
- C represents the output of CVl (Fig. 1).
- the Whole frequency band of 170,000-190,000 cycles is fed in at A and fed out at B (see Fig. 2), the central teleplicneband being fed out at C whence it is passed through a filter F1 (see Fig. 1) Whose cut-olf points are arranged to pass only those frequencies covered by the telephone modulated carrier. It is then rectified and amplified in a direct current amplifier D1, passed through an automatic ⁇ gain regulator, such as that described in my copending U.
- the output from line B (see Fig. 2) is subjected to the Vaction of a second heterodyne H2 supplying 150,000 cycles (see Fig. 1) and modulators M2, whereby the carrier frequency is changed to a frequency of 30,000 cycles and this new carrier is eliminated by a filter F2 having'an infinite impedance to 30,000 cycles per second.
- This carrier elimination is efiectedf'or the' following reasons:-
- the carrier wave is vmuch more powerful than any of the modulating waves and consequently any attempt to secure a further large amplification of all the modulated Waves separately or as a unit without suppressing the carrier, would prove a Very diflicult matterif saturation and rectification are to be carefully avoided as is thefcase.
- the modulated signals having the .carrier suppressed are now passed through a pair of parallel filters F3, F4 Ione of which is a high pass and the other a low pass filter, designed to separate the upper and-lower modulation side -bands land to attenuate strongly the telephone-frequencies.
- the low pass lter admits only frequencies below26,00'0 cycles and the highpass ltcradmits only frequencies ⁇ above l341,000'cycles per second.
- the side bands are thus separated'in order to obtain the advantage 'of the frequently observed time differences in fading which occurs between them. It is obvious that the high and lowpass filters can be replaced by suitable band lters.
- the outputs from the filters F3, TFi are now passed through multi-stage band filter amplifiers A4,A5, designed each toadmit arfrequency band'4000 cycles wide on a ycentral frequency in one case 8,000cycles'above, and inthe other 8,000 cycles below 30,000 cycles, (3,000 cycles is of course, the central frequency between the two telegraph frequencies).
- the outputs from these band filter amplicrs operate into remodulators R1, R2, whereby the suppressed carrier is resupplied at constant amplitude by a local-"gen-f erator G operating through coupling valves CV3, CVl. This local generator, and the second heterodyne whereby a carrier frequency of 30,000
- f cycles was rst obtained, must be of as constant frequency and as pure'and free from vharmonics as possible.
- each is Igoverned by means of a known neon tube indicating wavemeter or similar device (indicated at'Wl andWZ) whereby their frequencies may be adjusted-'and maintained within cycles of the vrequired value-a degree of I accuracy which is amply sufcient.
- the required correction of time can be obtained by the use of a delay circuit introduced either in the high or the low frequency of one of the telegraph detectors.
- a delay circuit introduced either in the high or the low frequency of one of the telegraph detectors.
- Such delay circuits are indicated at The local generator'G'is also'arranged to ⁇ feed (preferably through-couplingva1ve CV5) a detector controlling Icircuit M3 (preferablyof the push-pull type) whose inputcircuit is 'also fed as shown from -one or all of the Vtrap circuits involved in the construction of Ythe vfilter F2 -designed for the suppression of fthe 30,000 cycle carrier.
- the localgenerator G lan'd'thesecond Aheterodynel+12 maybeadjusted to be usubstantially constant and the latter can be maintained adjusted to thecorrect Vvwave vlengthfto produce 'a beatof '30,'000-cycles, so long as'the first 'heterodyne Ychanges the original carrierto 180,000 cycles-#the ⁇ middle frequency -of the ⁇ first band amplier-so that adjustment is-reduced to thatef the first heterodyne.
- the cutputof this'filter maybe amplified, :as stated above, by the low frequency amplifier ,A6140 workingwinto aloud speaker which will onlylbe silent ⁇ for thea-zero 'point ⁇ of adjustment.
- Asensitive relays tuned to say 250, 350 and 450 cycles, and'adapt-45 ed to light'lampsf of different colors. Such relays are 'indicated at l, -2 and 3 in -Fig. 3, :the lamps being lindicated. bynumerals 4,: l5 and 6.
- a harmonic of the generator Gris utiv150 lized as the second heterodyne H2
- the installation is renderedstill more convenient to control and satisfactory to use.
- the middle band frequency of the amplifier Al is chosen at 181,998 cycles, andthe carrierfrequency to be suppressed at F2 and 4re-supplied at R1, R2 is 30,333 cycles
- the seventh harmonic of the frequency generated at G i. e. 212,331 cycles
- a preferred arrangement is to employ a common master generator (G) for al1 the receivers a harmonic of the output of the said generator being yemployed as a master second heterodyne 4(H2) for all the receivers.
- G common master generator
- H2 master second heterodyne 4(H2)
- a harmonic frequency may be obtained from the generator G in any desired manner. j
- the following method has, however,been found suitable in practice:- i
- the fundamental frequency is generated by a valve circuit and flows in an oscillatory circuit comprising a condenser shunted by an inductance.
- the impedance ⁇ of the condenser to harmonic frequency is much less than the impedance of the inductance, a larger current of the harmonic frequency will flow in the condenser branch, and by coupling a coil to a small inductance in this branch, the current of harmonic frequency can be obtained and applied in a tuned amplifier to raise its amplitude to a suitable value.
- controlling device providing the local generator is free from undesired harmonics
- the controlling device cannot introduce any perturbation in the telephone channel working on 180,000 plus or minus 2500 cycles.
- the method of signaling utilizing the reception of a carrier wave modulated by a plurality of signals, which includes reducing the frequency of the carrier of all of the signals, separating the side bands of the reduced carrier, detecting side bands of the reduced carrier caused by one of the signals, and still further reducing the carrier frequency of other of said signals, filtering out the last utilized carrier, amplifying the side bands of said last utilized carrier and resupplying the carrier to the amplified side bands.
- the method of signaling utilizing the reception of a carrier Wave modulated by a plurality of signals, which includes reducing the frequency of the carrier of all of the signals, separating the side bands of the reduced carrier, detecting side bands of the reduced carrier caused by one of the signals, and still further reducing the carrier frequency of other of said signals, isolating the last utilized carrier, amplifying the side bands of said lastutilized carrier, generating ,a constant amplitude(carriensupplying the generated carrier to thel amplified side bands-and combining the, generated carrier and the isolated carrier.
- a radio receiver adapted for the carrier wave modulated by a plurality of signals, which includes means 'forredurcing the frequency ofthe carrier of all of the signals, means for separating the side bands of the reduced carrier, means for detecting side bands of the reduced carrier caused by one of the sig- Iials, means for still further reducing the carrier frequency of other of said signals, means for eliminating the last utilized carrier, means for amplifying side bands of said last utilized carrier and means for resupplying a carrier to the amplifiedV side bands.
- a radio receiver adapted for receiving a carrier modulated by a plurality of signals, means for reducing the frequency of the carrier of all the signals, means for separating the sidebands of the reduced carrier, means for detecting side bands of the reduced carrier caused by one of the signals, and means for still further reducing the carrier frequency of other of said signals, means for isolating the last utilized carrier, means for amplifying the side bands of said last utilized carrier, ⁇ a generator for generating a constant amplitude carrier, means for supplying the generated carrier to the amplified side bands, and means for beating together the generated and the isolated carrier.
- a filter for passing substantially all of the frequencies covered by modulating a carrier by a plurality of signals, heterodyning means for reducing the carrier frequency, means for separating a band of frequencies caused by one of the signals fromj the reduced modulated carrier, other heterodyning means for further reducing the carrier frequency of the other signals, means for shunting out the further reduced carrier, means for separating and amplifying the side bands of the carrier which has been shunted out, means for generating a carrier, and means for combining the generated carrier and the carrier which has been shunted out to produce a beat note.
- the method of signaling utilizing the reception of a carrier wave modulated by a plurality of signals, which includes reducing the frequency of thecarrier of all of the signals; separating out certain of the side bands of the reduced carrier and detecting said side bands for deriving therefrom certain of the signals and still further reducing the carrier frequency of the other of said signals.
- Means forrec'eiV-ingaicarierinodlatedby a plurality f signalfrequencies including, -reans for producing and combining Va plurality of beat frequencies with said; 'carrier -fequ'n ⁇ cy,fsai beat frequencies being such as -to yproduce the fsaine carrier frequency Ain different Y"parts V*of the Ifile'- DCving means, means ferlbea'tingthe last-named frequencies, rand-Irieansfor indicating the resultantbeatnote. y
- VReceiving means for demodul-'atingf'a carrier frequency Yon whichhas been ysupe'r'po's"e'd"a-plu rality 4of signal vfrequencies including, L'lietero'- slfluitinglelfithecarrierafgenerator for producing cluding, ahindioatingdevice actuated
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Superheterodyne Receivers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB30089/27A GB305703A (en) | 1927-11-09 | 1927-11-09 | Improvements in or relating to radio and the like high frequency receiving systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1942561A true US1942561A (en) | 1934-01-09 |
Family
ID=10302076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US314885A Expired - Lifetime US1942561A (en) | 1927-11-09 | 1928-10-25 | Radio signaling system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1942561A (de) |
| DE (1) | DE507803C (de) |
| GB (1) | GB305703A (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2493093A (en) * | 1946-02-28 | 1950-01-03 | Rca Corp | Radio receiver system |
| DE1142917B (de) * | 1958-06-05 | 1963-01-31 | Csf | Verfahren und Anordnung zum frequenzspektralen Umsetzen einer amplituden- und phasenmodulierten elektrischen Schwingung |
-
1927
- 1927-11-09 GB GB30089/27A patent/GB305703A/en not_active Expired
-
1928
- 1928-08-28 DE DEM106284D patent/DE507803C/de not_active Expired
- 1928-10-25 US US314885A patent/US1942561A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2493093A (en) * | 1946-02-28 | 1950-01-03 | Rca Corp | Radio receiver system |
| DE1142917B (de) * | 1958-06-05 | 1963-01-31 | Csf | Verfahren und Anordnung zum frequenzspektralen Umsetzen einer amplituden- und phasenmodulierten elektrischen Schwingung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE507803C (de) | 1930-09-20 |
| GB305703A (en) | 1929-02-11 |
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