US1472092A - Receiver for wireless telegraphy - Google Patents
Receiver for wireless telegraphy Download PDFInfo
- Publication number
- US1472092A US1472092A US483493A US48349321A US1472092A US 1472092 A US1472092 A US 1472092A US 483493 A US483493 A US 483493A US 48349321 A US48349321 A US 48349321A US 1472092 A US1472092 A US 1472092A
- Authority
- US
- United States
- Prior art keywords
- frequency
- circuit
- oscillations
- aerial
- signal
- 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
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Definitions
- This invention relates to improvements in receivers for wireless telegraphy and has for its object the elimination of atmospherlcs.
- I make the natural frequency of the receiving aerial different from that of the received waves so that both the forced and the free oscillations occur producing the well known phenomenon of beats and I rectify the resultant current and carry it to a circuit tuned to the beat frequency and I may directly.
- A is the aerial slightly out of tune with the incoming signal waves.
- B is 'a circuit which is coupled to the aerial and which is preferably aperiodic.
- D is a circuit connected to the circuit B through a rectifying crystal C and tuned to the frequency of the beats due to the forced and free oscillations and T is a telephone inductively coupled to the circuit D.
- a B C, D are the same as before but D is now coupled throu h an intermediate circuit E to a circuit 1 in which oscillations can be induced by means of a local oscillation circuit F of such a frequency as to interfere with the oscillations in D producing beats of a frequency within the limits of audibility.
- the circuit B is connected through a second rectifier Q to a circuit D connected to a telephone.
- Figure 3 is similar to Figure 1 except that -a local oscillation circuit F is provided for eneratin continuous oscillators in B for inter ering with the forced oscillations in the aerial when continuous oscillations are employed for signalling.
- the frequency of the oscillations induced in circuit D by circuit F may be equal to the natural frequency of the aerial.
- a receiver for wireless telegraphy the combination of an aerial slightly out of tune with the signal waves, means for rectifying the resultant current due to the forced and free oscillations in the aerial and a circuit tuned to the beat frequency.
- a receiver for wireless telegraphy the combination of an aerial slightly out of tune with the signal waves, a circuit coupled to the aerial, means for generating in that circuit oscillations of a frequency slightly different from that of the signal waves, means for rectifying the resultant current and a circuit tuned to the beat frequency.
- a method of eliminatin the results of atmospherics in wireless te egraph receivers which consists in the production by oscillations having slightly different frequencies of beats having widely different frequencies.
- a method of eliminating the results of atmospherics in wireless telegraph receivers which consists in the production of a frequency interfering with the received frequency, rectifying, inducing a frequency interfering with the resultant oscillations and rectif ing again.
- a radio receiving system the combination of an aerial sllghtly out of tune with the signal waves, a receiving circuit coupled thereto, a circuit tuned to a frequency equalling the difference between the aerial frequency and the signal fre uency, and rectifyin means between said circuits.
- the combination'of high frequency circuits comprising an aerial-slightly out of tune with the signal-waves, a receiving circuit coupled thereto, a source of local oscillations coupled to the high frequency circuits, a low 7 frequency circuit tuned to a frequency equalling the difference between the aerial frequency and the signal fre uency, and rectifying means between sai receiving circuit and said low frequency circuit.
- hi h fre uency circuits comprising an aeria slight y out of tune with the signal waves, a receivingcircuit coupled thereto, a source of local oscillations coupled to the high frequency circuits, a low frequency circuit tuned to a frequency equallmg the difference between the aerial frequency and the signal frequency, and rectiying means between said recelvmg circuit and said low frequency circuit.
- a radio receiving signal system the combination of high frequency circuits comprising an aerial slightly out of tune with the signal waves, a receiving circuit coupled thereto, a source of local oscillations coupled to the high frequency circuits of the same order of magnitude as the frequency of high frequency circuits, a low frequency circuit tuned to a frequency equalling the difference between the aerial frequency and the signal frequency and rectifying means between said receiving circuit and said low frequency circuit.
- a radioreceiving signal system the combination of high frequency circuits comprising an aerial slightly out of tune with the signal waves, a receiving circuit coupled thereto, a source of local oscillations coupled to the hi h frequency circuit having a frequency su stantially equal to the aerial fregpency, a low frequency circuit tuned to a equency equalling the difierence between the aerial frequency and the signal fre uency and rectifying means between sai receiving circuit and said low frequency circuit.
- a method of eliminating atmospheric interference in radio rece tion which consists in causing the sai signal and at- 120 mospheric efiects to produce oscillations of two different frequencies, superimposin alocal frequency on said oscillations of .a requency adapted to produce beats of different frequencies therewith and selectin the 125 beat fre uency produced between the signal and the ocal oscillations.
- a method of eliminating atmospheric interference in radio signaling which consists in slightly detuning the aerial to cause 130 the signal and atmospheric effects to produce oscillations of two slightly different frequencies, superimposing a local frequency on said oscillations of a frequency adapted to produce beats with said oscillations of different frequencies and selecting the beat due to the signal and local oscillation.
- a method of receiving radio si which consists in causing the receive effects to produce oscillations of two different frequencies, rectifying the beats between said oscillations, superimposing a local frequency on the resultant beat frequency and rectifying again.
- a method of receiving radio signals which consists in causing the received ef fects to produce oscillations of two different frequencies differing from each other so as to produce inaudible beats, rectifying the beats between said oscillations, superimposing a local frequency on said inaudible beats ada ted to produce therewith an audible beat re uency and rectifying again.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB191327480D GB191327480A (en) | 1913-11-28 | 1913-11-28 | Improvements in Receivers for Wireless Telegraphy. |
FR518396A FR518396A (fr) | 1913-11-28 | 1920-07-01 | Perfectionnements aux récepteurs de télégraphie sans fil |
US483493A US1472092A (en) | 1913-11-28 | 1921-07-09 | Receiver for wireless telegraphy |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB191327480T | 1913-11-28 | ||
US483493A US1472092A (en) | 1913-11-28 | 1921-07-09 | Receiver for wireless telegraphy |
Publications (1)
Publication Number | Publication Date |
---|---|
US1472092A true US1472092A (en) | 1923-10-30 |
Family
ID=32372887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US483493A Expired - Lifetime US1472092A (en) | 1913-11-28 | 1921-07-09 | Receiver for wireless telegraphy |
Country Status (3)
Country | Link |
---|---|
US (1) | US1472092A (fr) |
FR (1) | FR518396A (fr) |
GB (1) | GB191327480A (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2627023A (en) * | 1942-09-12 | 1953-01-27 | Irving H Page | Noise reducing radio receiver |
-
1913
- 1913-11-28 GB GB191327480D patent/GB191327480A/en not_active Expired
-
1920
- 1920-07-01 FR FR518396A patent/FR518396A/fr not_active Expired
-
1921
- 1921-07-09 US US483493A patent/US1472092A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2627023A (en) * | 1942-09-12 | 1953-01-27 | Irving H Page | Noise reducing radio receiver |
Also Published As
Publication number | Publication date |
---|---|
FR518396A (fr) | 1921-05-24 |
GB191327480A (en) | 1914-11-26 |
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