GB537076A - Improvements in or relating to apparatus for producing amplitude modulated waves in radio transmitters - Google Patents
Improvements in or relating to apparatus for producing amplitude modulated waves in radio transmittersInfo
- Publication number
- GB537076A GB537076A GB31458/39A GB3145839A GB537076A GB 537076 A GB537076 A GB 537076A GB 31458/39 A GB31458/39 A GB 31458/39A GB 3145839 A GB3145839 A GB 3145839A GB 537076 A GB537076 A GB 537076A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- valves
- carrier
- voltage
- grids
- 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
- H03C1/50—Amplitude modulation by converting angle modulation to amplitude modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
Abstract
537,076. Valve amplifying circuits for wireless transmission. SOC. FRANCAISE RADIOELECTRIQUE. Dec. 4, 1939, Nos. 31458, 31459 and 31460. Convention dates, Dec. 2, 1938, Dec. 29, 1938 and Feb. 25, 1939. [Class 40 (v)] Modulated waves are supplied to an aerial through two or more amplifying paths in different phases which combine vectorially to produce the aerial current so long as the carrier is below its mean value ; but at carrier values higher than the mean the vector angle is reduced so that although the output from each valve is held substantially constant, their vectorial sum increases The system thus leads to greater efficiency in the output stages. As shown in Fig. 2, the waves from a carrier source O are modulated at M and amplified at C, whence components U 1 , U 2 in phase opposition are applied to the grids g 1 , g 2 of the power valves 1, 2, and a third component Ub in phase quadrature is applied to the grids in parallel. The plate circuits of both valves include the aerial load Ra, and the voltage Ua across this load is also fed back into the grid circuits in opposition to Ub. The resultant voltages in the grids g 1 , g 2 have a certain phase difference which may be about 140 degrees, and so long as the carrier voltage is below normal this angle remains constant and the aerial current is proportional to the grid voltage. The valves, however, begin to saturate at carrier voltages greater than normal, with the result that the feed-back voltage diminishes relatively, and this causes a reduction in the phase angle between the grid voltages, and a consequent increase in the vectorial sum of the plate currents. Slight distortion occurring at the peaks of the modulating voltage may be corrected by known devices such as negative reaction from an auxiliary amplifier connected in parallel with the main amplifier (Fig. 5 not shown). The valves 1, 2 may each be replaced by two valves in cascade, and the feed-back voltage Ua may be taken from the combined output of the second stage to the input of the first (Fig. 6 not shown). The quadrature voltage Ub may be fed to a valve separate from the valves 1, 2, and the feed-back voltage Ua also applied to the grid of this additional valve (Fig. 7 not shown). Fig. 9 shows an arrangement using two pairs of push-pull valves with tuned input circuits 2, 21 fed with modulated waves from a source 1. The tuned output circuits 3, 31 are equally coupled one magnetically and the other statically to the load Ra. In addition the source 1 of modulated waves is coupled to a tuned circuit 211, the sides of which are connected through condensers and inductances respectively to the valve grids, as indicated by the letters A, B, A<SP>1</SP>, B<SP>1</SP>. The feed-back voltage across the load Ra is also applied to the grids through inductances and condensers as shown. Fig. 11 shows a further modification using two push-pull stages in cascade. The valves L<SP>3</SP>, L<SP>4</SP> of the first stage are fed with the modulated wave at A, B but are differently biased. The valve L3 operates as a Class B amplifier with saturation in the plate circuit when the carrier rises above the mean value. The valve L4 is biased for Class C amplification, and gives no output until the carrier is above the mean value. The valve L4 feeds the grids of the'next valve pair L<SP>1</SP>, L<SP>2</SP> in parallel, while the valve L3 feeds the same grids in push-pull through an intermediate coupling circuit G, giving a quadrature phase relationship with respect to the first path. Two supplementary circuits P, Q are inserted in the grid leads of the valves L<SP>1</SP>, L<SP>2</SP> for giving a phase advance on one grid and a phase lag to the other. The tuned output circuits are respectively coupled magnetically and statically to the output transformer feeding the load. A coil V feeds back from the output transformer to the input terminals A, B.. The phase angle between the grid voltages of the valves L<SP>1</SP>, L<SP>2</SP> remains constant for subnormal values of the carrier, but when the carrier rises above normal the valve L3 begins to operate, and causes the phase angle to vary with the result that although the valve L4 is saturated, the ultimate voltage delivered to the load rises in correct relation. For setting up purposes a dummy load W may be substituted for the aerial by the operation of switches X, Y. Specifications 270,749, [Class 40 (v)], 372,090, 383,928 and 409,628 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR759851X | 1938-12-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB537076A true GB537076A (en) | 1941-06-09 |
Family
ID=9167474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31458/39A Expired GB537076A (en) | 1938-12-02 | 1939-12-04 | Improvements in or relating to apparatus for producing amplitude modulated waves in radio transmitters |
Country Status (6)
Country | Link |
---|---|
US (2) | US2282714A (en) |
CH (1) | CH222396A (en) |
DE (1) | DE759851C (en) |
FR (3) | FR854015A (en) |
GB (1) | GB537076A (en) |
NL (1) | NL57174C (en) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL156682B (en) * | 1949-11-02 | Science Union & Cie | PROCESS FOR THE PREPARATION OF MEDICINAL DIBENZOCYCLOALKYL DERIVATIVES, PROCESS FOR THE PREPARATION OF A MEDICINAL PRODUCT FROM THEIR AND FORMED MEDICINAL PRODUCT. | |
US2719190A (en) * | 1950-10-27 | 1955-09-27 | Bell Telephone Labor Inc | High-efficiency translating circuit |
NL170979B (en) * | 1951-07-12 | Keystone Int | BUTTERFLY VALVE VALVE. | |
GB989329A (en) * | 1964-01-16 | 1965-04-14 | Standard Telephones Cables Ltd | Electrical amplifying circuits |
DE3906448C1 (en) * | 1989-03-01 | 1990-03-15 | Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De | |
US6334234B1 (en) * | 1999-01-08 | 2002-01-01 | Fantom Technologies Inc. | Cleaner head for a vacuum cleaner |
US7071775B2 (en) * | 2004-06-21 | 2006-07-04 | Motorola, Inc. | Method and apparatus for an enhanced efficiency power amplifier |
US7355470B2 (en) | 2006-04-24 | 2008-04-08 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation, and amplification, including embodiments for amplifier class transitioning |
US7327803B2 (en) | 2004-10-22 | 2008-02-05 | Parkervision, Inc. | Systems and methods for vector power amplification |
US7911272B2 (en) | 2007-06-19 | 2011-03-22 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation, and amplification, including blended control embodiments |
US9106316B2 (en) | 2005-10-24 | 2015-08-11 | Parkervision, Inc. | Systems and methods of RF power transmission, modulation, and amplification |
US8013675B2 (en) | 2007-06-19 | 2011-09-06 | Parkervision, Inc. | Combiner-less multiple input single output (MISO) amplification with blended control |
US7937106B2 (en) | 2006-04-24 | 2011-05-03 | ParkerVision, Inc, | Systems and methods of RF power transmission, modulation, and amplification, including architectural embodiments of same |
US8031804B2 (en) | 2006-04-24 | 2011-10-04 | Parkervision, Inc. | Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion |
US7620129B2 (en) | 2007-01-16 | 2009-11-17 | Parkervision, Inc. | RF power transmission, modulation, and amplification, including embodiments for generating vector modulation control signals |
WO2008144017A1 (en) | 2007-05-18 | 2008-11-27 | Parkervision, Inc. | Systems and methods of rf power transmission, modulation, and amplification |
WO2009005768A1 (en) | 2007-06-28 | 2009-01-08 | Parkervision, Inc. | Systems and methods of rf power transmission, modulation, and amplification |
US7714649B1 (en) | 2008-06-02 | 2010-05-11 | Rockwell Collins, Inc. | High-efficiency linear amplifier using non linear circuits |
KR20140026458A (en) | 2011-04-08 | 2014-03-05 | 파커비전, 인크. | Systems and methods of rf power transmission, modulation, and amplification |
EP2715867A4 (en) | 2011-06-02 | 2014-12-17 | Parkervision Inc | Antenna control |
US20150080063A1 (en) | 2013-09-17 | 2015-03-19 | Parkervision, Inc. | Method, apparatus and system for rendering an information bearing function of time |
WO2016056956A1 (en) | 2014-10-07 | 2016-04-14 | Telefonaktiebolaget L M Ericsson (Publ) | Driver circuit for composite power amplifier |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL25389C (en) * | 1926-05-10 | |||
FR39312E (en) * | 1930-05-06 | 1931-10-12 | Radio Electr Soc Fr | Improvements in radio communication methods |
DE598086C (en) * | 1931-07-29 | 1934-06-05 | Radio Electr Soc Fr | Method for the wireless transmission of messages by means of two electric circuits fed by a generator and working in differential coupling on the antenna circuit |
DE611876C (en) * | 1934-02-04 | 1935-04-09 | Radio Electr Soc Fr | High-frequency transmission arrangement for modulated signals |
-
0
- NL NL57174D patent/NL57174C/xx active
-
1938
- 1938-12-02 FR FR854015D patent/FR854015A/en not_active Expired
- 1938-12-29 FR FR50403D patent/FR50403E/en not_active Expired
-
1939
- 1939-02-25 FR FR856319D patent/FR856319A/en not_active Expired
- 1939-11-08 CH CH222396D patent/CH222396A/en unknown
- 1939-12-01 US US307022A patent/US2282714A/en not_active Expired - Lifetime
- 1939-12-03 DE DES139430D patent/DE759851C/en not_active Expired
- 1939-12-04 GB GB31458/39A patent/GB537076A/en not_active Expired
-
1940
- 1940-02-24 US US320532A patent/US2269518A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2269518A (en) | 1942-01-13 |
FR50403E (en) | 1940-06-05 |
NL57174C (en) | |
DE759851C (en) | 1952-11-10 |
FR856319A (en) | 1940-06-11 |
US2282714A (en) | 1942-05-12 |
CH222396A (en) | 1942-07-15 |
FR854015A (en) | 1940-04-03 |
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