GB149973A - Improvements in receiving methods of radio-telegraphic and radiotelophonic signals - Google Patents
Improvements in receiving methods of radio-telegraphic and radiotelophonic signalsInfo
- Publication number
- GB149973A GB149973A GB23347/20A GB2334720A GB149973A GB 149973 A GB149973 A GB 149973A GB 23347/20 A GB23347/20 A GB 23347/20A GB 2334720 A GB2334720 A GB 2334720A GB 149973 A GB149973 A GB 149973A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- tuned
- valve
- rectifier
- electrode
- 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
- 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
- H04B1/22—Circuits for receivers in which no local oscillation is generated
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
- H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
149,973. Bardeloni, C. Jan. 10, 1918, [Convention date]. Wireless signalling.-In a receiving system employing a thermionic valve and a crystal or other rectifier, interference by signals of neighbouring wave-length, or bv atmospherics, is prevented bv the use of one or more auxiliary tuned circuits connected to additional electrodes of the valve. Signal currents are taken from the aerial to the valve 24, Fig. 1, through a circuit 7, 8 tuned to the. signal-wave frequency, and the aerial is also coupled to a circuit 10, 11 which is tuned to the interfering frequency (or to a frequency slightly above or below that of the signal waves, when atmospherics are to be eliminated), this circuit being connected to an auxiliary electrode 23. A rectifier 19 is connected through an adjusting-battery 18 and potentiometer 17 between the grid 12 and filament 14, in parallel with the receiving-circuit. In the modification shown in Fig. 3, the rectifier 19 and its battery &c. are connected in series in the receiving-circuit. The electrode 23 is placed on the outside of the valve 24, and the circuit 10, 11 is connected between this electrode and the filament circuit. There may be two circuits, such as 10, 11, tuned to interfering frequencies above and below that of the signal waves and connected to separate auxiliary electrodes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT149973X | 1918-01-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB149973A true GB149973A (en) | 1921-10-27 |
Family
ID=11146177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23347/20A Expired GB149973A (en) | 1918-01-10 | 1920-08-09 | Improvements in receiving methods of radio-telegraphic and radiotelophonic signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB149973A (en) |
-
1920
- 1920-08-09 GB GB23347/20A patent/GB149973A/en not_active Expired
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