GB540773A - Improvements in or relating to radio transmitters for ultra-high frequencies - Google Patents
Improvements in or relating to radio transmitters for ultra-high frequenciesInfo
- Publication number
- GB540773A GB540773A GB9180/40A GB918040A GB540773A GB 540773 A GB540773 A GB 540773A GB 9180/40 A GB9180/40 A GB 9180/40A GB 918040 A GB918040 A GB 918040A GB 540773 A GB540773 A GB 540773A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earthed
- casing
- axial line
- frequency
- wires
- 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
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/02—Lecher resonators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
- H03B5/1817—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
- H03B5/1835—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a vacuum tube
Landscapes
- Particle Accelerators (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
540,773. Electric resonators; wireless signaling. ELECTRICAL RESEARCH PRODUCTS, Inc. May 24, 1940, No. 9180. Convention date, July 26, 1939. [Classes 40 (iii) and 40 (v)] In an ultra-high-frequency transmitter tuned by Lecher wires, the effective length of the wires 16, 17 is varied by axial adjustment of a third parallel conductor 30; the earth connection of the cathode 11 is tunable at 37, 38; frequency modulation is effected, for a distance-indicating system, by rotation of a condenser plate 25 by a motor 26, and the earthward capacitive path through the bearings of the motor is short-circuited by capacity at 57 to eliminate fluctuations of output ; the coupling of the transmitter to the aerial can be varied by deformation of a loop 19 ; and the transmitter is enclosed in an earthed conductive casing 18, the parts being adjustable from outside the casing. The oscillator valve 10 is tuned by screwing the earthed rod 30 in or out so as to vary the length of the part of it which is adjacent to the Lecher wires 16, 17. These terminate in plates 48, 50 which are insulated from the casing 18 by mica, so as to form bypass condensers, and are connected respectively to the anode battery 44 and variable grid-leak resistance 46. The filament current is drawn from a battery 36 through a co-axial line 34 which is somewhat less than a quarter of a wave-length long and has its inner and outer conductors connected respectively to plates 71 and 52 which form byepass condensers with the casing 18, while the outer conductor is also capacitively earthed through a pair of plates 37, 38, the latter of which is earthed through a bearing 43, can be moved axially by means of an insulating rod 40, for the purpose of tuning the connection between filament and earth, and is frictionally held by a fibre bush 42. The frequency of the oscillator may be tested by means of a wavemeter 63 which is connected to the outside of the co-axial line 34 at a suitable point through resistance 73. The frequency is modulated by a rotating condenser 25 driven by a motor 26, but the capacitive earthward path through the ball bearings 56 tends to cause fluctuations in the amplitude of the output; this effect is prevented by a short-circuiting condenser which comprises an outer fixed and earthed cylinder 58 and an inner revolving cylinder 57 mounted on an insulative upper portion 54 of the shaft. The antenna circuit comprises a dipole antenna 21 fed through a co-axial line 20, and a second length 22 of co-axial line having a short-circuiting plug 23 whose position can be adjusted by means of a knob 24 for the purpose of tuning the aerial circuit. The latter is connected to the Lecher wires 14, 15, and so to the valve 10, through a deformable U-shaped loop 19 which is joined to the inner conductors of the co-axial lines 20, 22 and can be bent into or away from the plane of the Lecher wires by means of an adjusting-nut 70. Specification 533,538 is referred to.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US286682A US2261879A (en) | 1939-07-26 | 1939-07-26 | High frequency by-pass arrangement |
US412940A US2310695A (en) | 1939-07-26 | 1941-09-30 | Oscillating system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB540773A true GB540773A (en) | 1941-10-29 |
Family
ID=26964006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9180/40A Expired GB540773A (en) | 1939-07-26 | 1940-05-24 | Improvements in or relating to radio transmitters for ultra-high frequencies |
Country Status (2)
Country | Link |
---|---|
US (1) | US2310695A (en) |
GB (1) | GB540773A (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2735941A (en) * | 1956-02-21 | High frequency vacuum tube circuit | ||
US2439255A (en) * | 1942-09-09 | 1948-04-06 | Gen Electric | Capacitor switch |
US2617038A (en) * | 1943-06-23 | 1952-11-04 | Carl M Russell | Ultrahigh-frequency device |
US2477581A (en) * | 1943-06-24 | 1949-08-02 | Danziger Albert | Ultra high frequency oscillator |
US2487547A (en) * | 1943-11-20 | 1949-11-08 | Sylvania Electric Prod | Wave shielding arrangement |
BE480312A (en) * | 1944-01-12 | |||
US2514957A (en) * | 1944-06-27 | 1950-07-11 | Hazeltine Research Inc | High-frequency tuning device |
US2572970A (en) * | 1944-08-31 | 1951-10-30 | Bell Telephone Labor Inc | Coaxial line coupler |
US2467736A (en) * | 1945-02-24 | 1949-04-19 | Rca Corp | Suppression of parasitic oscillations |
US2568718A (en) * | 1945-04-28 | 1951-09-25 | Torrence H Chambers | Variable inductive coupling |
US2480140A (en) * | 1945-08-02 | 1949-08-30 | Us Sec War | Antenna switching device |
US2696554A (en) * | 1945-10-16 | 1954-12-07 | Andrew V Haeff | Microwave signal generator |
US2763783A (en) * | 1946-04-05 | 1956-09-18 | Howard O Lorenzen | High frequency oscillator |
US2540640A (en) * | 1947-03-07 | 1951-02-06 | Rca Corp | Electron discharge device system for obtaining similar or differential tuning adjustments |
US2821684A (en) * | 1949-07-25 | 1958-01-28 | Gen Electric | Noise elimination system for capacitive scanning apparatus |
US2909731A (en) * | 1956-10-03 | 1959-10-20 | Jack V Franck | Cavity excitation circuit |
US3899752A (en) * | 1973-11-15 | 1975-08-12 | Engelmann Microwave Co | Microwave oscillator |
-
1940
- 1940-05-24 GB GB9180/40A patent/GB540773A/en not_active Expired
-
1941
- 1941-09-30 US US412940A patent/US2310695A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2310695A (en) | 1943-02-09 |
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