GB605878A - Angle modulated carrier wave detector - Google Patents
Angle modulated carrier wave detectorInfo
- Publication number
- GB605878A GB605878A GB17986/45A GB1798645A GB605878A GB 605878 A GB605878 A GB 605878A GB 17986/45 A GB17986/45 A GB 17986/45A GB 1798645 A GB1798645 A GB 1798645A GB 605878 A GB605878 A GB 605878A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- target
- cathode
- electron beam
- primary
- 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
- 238000010894 electron beam technology Methods 0.000 abstract 4
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/32—Demodulation of angle-, frequency- or phase- modulated oscillations by deflecting an electron beam in a discharge tube
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
- Microwave Tubes (AREA)
Abstract
605,878. Frequency modulation; circuits for cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 13, 1945, No. 17986. Convention date, July 14, 1944. Addition to 605,715. [Classes 40 (v) and 40 (vi)] [Also in Group XL (a)] A detector for angle-modulated carrier waves comprises a discriminator for deriving a pair of high-frequency voltages whose relative magnitudes vary in accordance with the frequency of the applied wave, a cathode-ray tube having an output electrode with at least two areas of different secondary electron. emissivity, and deflector elements to sweep the primary electron beam over the-two areas in response to the high-frequency voltages to vary the output electrode current. The discriminator of a frequency-modulated superheterodyne receiver, Fig. 1, consists of a primary tuned circuit 13 coupled to two off-tune circuits 15, 16 which are connected to the deflection plates 5, 6 of a cathode-ray tube 1. The cathode-ray tube has a focussing electrode 4 and two pairs of deflection plates 5, 5<1>, 6, 6<1>, one of each pair being earthed. The primary electron beam 3 is swept in an elliptical path over the circular target T in response to the relative amplitude variations in the H.F. voltages appearing at the deflection plates. The target T has four equal sectors of different secondary electron emissivity, the diametrically -opposed sectors is maintained at a lower positive potential than the collector 'electrode E, which is constructed so as to permit the passage of the primary beam 3 in which it is placed. As the frequency of the received wave varies, the pattern traced on the target T by the primary electron beam 3 changes, thus varying the width and recurrence frequency of the output pulses which appear across resistance R. Since the shape of the pattern traced on target T by beam 3 is independent of the amplitude of the received wave, and the output voltage of target T does not depend on the size of the trace, the signal appearing across integrating condenser 11 is independent of amplitude variations in the received wave. In a modification, Fig. 5, the target T has a central hole 30 slightly larger in diameter than the electron beam, so that no output appears across resistance R when no signal is present, thus reducing noise effects. U.S.A. Specification 2,344,679 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US544939A US2470731A (en) | 1944-07-14 | 1944-07-14 | Angle modulated carrier wave detector |
Publications (1)
Publication Number | Publication Date |
---|---|
GB605878A true GB605878A (en) | 1948-08-03 |
Family
ID=24174203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17986/45A Expired GB605878A (en) | 1944-07-14 | 1945-07-13 | Angle modulated carrier wave detector |
Country Status (2)
Country | Link |
---|---|
US (1) | US2470731A (en) |
GB (1) | GB605878A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3303420A (en) * | 1947-12-09 | 1967-02-07 | Harris Frederick | Instantaneous frequency resolver |
US2728911A (en) * | 1950-04-11 | 1955-12-27 | Cutler Phil | Frequency selective device |
US2689314A (en) * | 1951-07-12 | 1954-09-14 | Norman R Gunderson | Cathode-ray tube |
US2974274A (en) * | 1955-12-13 | 1961-03-07 | Lindberg | Secondary-emission cathode-ray tube and engine analyzer employing the same |
US3204107A (en) * | 1961-07-05 | 1965-08-31 | Honeywell Inc | Signal resolution increasing means |
US3388276A (en) * | 1966-12-01 | 1968-06-11 | Raytheon Co | High angular resolution cathode ray tube with sectorlike electrodes having different secondary emission areas |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2069441A (en) * | 1933-05-30 | 1937-02-02 | Rca Corp | Electron tube |
US2191185A (en) * | 1935-08-23 | 1940-02-20 | Loewe Radio Inc | Impulse generating arrangement |
US2202376A (en) * | 1938-05-28 | 1940-05-28 | Rca Corp | Cathode ray tube detector circuits |
US2305646A (en) * | 1939-11-14 | 1942-12-22 | Albert G Thomas | High frequency tube |
US2344679A (en) * | 1941-04-03 | 1944-03-21 | Rca Corp | Beam phase detector |
US2408702A (en) * | 1944-05-20 | 1946-10-01 | Rca Corp | Angle modulated wave detector |
-
1944
- 1944-07-14 US US544939A patent/US2470731A/en not_active Expired - Lifetime
-
1945
- 1945-07-13 GB GB17986/45A patent/GB605878A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2470731A (en) | 1949-05-17 |
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