GB146881A - Improvements in wireless signalling systems - Google Patents
Improvements in wireless signalling systemsInfo
- Publication number
- GB146881A GB146881A GB18799/20A GB1879920A GB146881A GB 146881 A GB146881 A GB 146881A GB 18799/20 A GB18799/20 A GB 18799/20A GB 1879920 A GB1879920 A GB 1879920A GB 146881 A GB146881 A GB 146881A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- waves
- circuit
- carrier
- tuned
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
Landscapes
- Transmitters (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
146,881. Western Electric Co., (Assignees of Arnold, H. dc F.). Dec. 1, 1915, [Convention date]. Wireless telegraphy and telephony.-In signalling systems in which high frequency carrier waves of frequency Q and a signalling wave of frequency P are impressed upon a modulator to produce in its output circuit modulated carrier waves which may be regarded as composed of three waves of frequencies Q, Q + P, and Q-P, a. resonating system is associated with the output circuit of the modulator to suppress the unmodulated component Q, or the unmodulated component Q to. gether with one of the modulated components Q + P or Q - P. Fig. 1 shows a wireless trans. mitting station arranged according to the invention. Carrier waves of frequency Q, generated by the oscillating valves, are impressed upon the input circuit of the modulator 5, the amplifying power of which is varied in accordance with the waves of signal frequency P in the microphone circuit 2. Modulated carrier waves in the output circuit of valve 5 are impressed upon an intermediate resonating system consisting of the resonant circuit 7, tuned to the carrier frequency Q, and a pair of resonant circuits 8, tuned to the frequencies Q + P and Q - P respectively. The system presents a small impedance to waves of frequency Q + P and Q - P, but a substantially infinite impedance to waves of frequency Q, thereby preventing the passage of unmodulated current of carrier frequency. Waves of the two transmitting frequencies, Q + P and Q - P are amplified by the amplifiers 10, 12, and delivered to the aerial 14. In a receiving system, Fig. 2, for use in connexion with this transmitter, power is transferred from the aerial 15 to a system of resonant circuits similar to that used in the transmitter, comprising a circuit 17 tuned to the carrier frequency Q, and a pair of circuits 18 tuned to the frequencies Q + P and Q - P. This system is coupled to the circuit 20, which receives oscillations of carrier frequency Q from the generator 26, and is coupled to a detector 22 through a transformer 21. By suppressing, in addition, one of the modulated components, Q + P or Q - P, the system may be used for secret transmission of messages. The invention may also be applied to ordinary line telegraphy or telephony. Specification 102,503 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64502A US1449372A (en) | 1915-12-01 | 1915-12-01 | System of telephony |
Publications (1)
Publication Number | Publication Date |
---|---|
GB146881A true GB146881A (en) | 1921-09-29 |
Family
ID=22056422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18799/20A Expired GB146881A (en) | 1915-12-01 | 1920-07-06 | Improvements in wireless signalling systems |
Country Status (5)
Country | Link |
---|---|
US (1) | US1449372A (en) |
CH (2) | CH104686A (en) |
DE (1) | DE353944C (en) |
FR (1) | FR517685A (en) |
GB (1) | GB146881A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL78602C (en) * | 1943-10-21 | 1955-06-22 | ||
US2559390A (en) * | 1947-07-03 | 1951-07-03 | Gen Railway Signal Co | Centralized traffic control system |
US2497592A (en) * | 1947-11-13 | 1950-02-14 | Lennart G Erickson | Carrier terminal equipment |
NL83168C (en) * | 1950-05-08 |
-
1915
- 1915-12-01 US US64502A patent/US1449372A/en not_active Expired - Lifetime
-
1917
- 1917-06-04 CH CH104686D patent/CH104686A/en unknown
-
1920
- 1920-05-23 DE DE1920353944D patent/DE353944C/en not_active Expired
- 1920-06-21 CH CH96264D patent/CH96264A/en unknown
- 1920-06-23 FR FR517685A patent/FR517685A/en not_active Expired
- 1920-07-06 GB GB18799/20A patent/GB146881A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1449372A (en) | 1923-03-27 |
CH104686A (en) | 1924-05-16 |
DE353944C (en) | 1922-05-30 |
FR517685A (en) | 1921-05-10 |
CH96264A (en) | 1922-09-16 |
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