GB535396A - Improvements in radio transmitters - Google Patents

Improvements in radio transmitters

Info

Publication number
GB535396A
GB535396A GB27677/39A GB2767739A GB535396A GB 535396 A GB535396 A GB 535396A GB 27677/39 A GB27677/39 A GB 27677/39A GB 2767739 A GB2767739 A GB 2767739A GB 535396 A GB535396 A GB 535396A
Authority
GB
United Kingdom
Prior art keywords
quadrature
currents
aerials
modulating
carrier
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
Application number
GB27677/39A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB535396A publication Critical patent/GB535396A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/18—Networks for phase shifting
    • H03H7/21—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output

Abstract

535,396. Wireless transmitting systems. LONGO, G. Oct. 11, 1939, No. 27677. Convention date, Oct. 11, 1938. [Classes 40 (iii) and 40 (v)] A transmitter comprises aerials A1 ... A4, Fig. 2, arranged in a circle, diametrically opposite aerials A1, A3 and also A2, A4 are energized in phase opposition with the carrier frequency suppressed. The modulating currents for the pair A1, A3 are in quadrature with the modulating currents for the pair A2, A4. An unmodulated carrier in quadrature with the suppressed carrier is radiated from a control aerial AO or from the four aerials in parallel. This method of radiation causes the instantaneous value of the energy radiated to equal the average value. Virtually the modulation rotates about the central aerial. If the modulating current be a single frequency f, the radial plane of maximum amplitude of the emitted wave rotates with an angular velocity 2#f, and the transmitter may be used as a beacon. Three or more pairs of circularly placed aerials may be used. The network, Fig. 3, enables two modulating currents in quadrature to each other to be derived from a complex audio current fed to the transformer T, these quadrature currents appearing respectively between terminals B<SP>1</SP>, B<SP>11</SP> and earth. In both the left and right banks the magnitude of the inductances and capacities are such that and the ratio of L1 or C1 of the left bank to L2 or C2 of the right bank is Á¢. Three or more banks may be used in the network to furnish polyphase instead of quadrature currents.
GB27677/39A 1938-10-11 1939-10-11 Improvements in radio transmitters Expired GB535396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR535396X 1938-10-11

Publications (1)

Publication Number Publication Date
GB535396A true GB535396A (en) 1941-04-08

Family

ID=8926149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27677/39A Expired GB535396A (en) 1938-10-11 1939-10-11 Improvements in radio transmitters

Country Status (2)

Country Link
US (1) US2231079A (en)
GB (1) GB535396A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436834A (en) * 1942-11-17 1948-03-02 Edwin K Stodola Phase and frequency modulation
US2495581A (en) * 1944-12-23 1950-01-24 Hammond Instr Co Electrical transmission system for musical instruments
US2701862A (en) * 1949-11-16 1955-02-08 Rca Corp Electric wave filter
US4352075A (en) * 1980-12-08 1982-09-28 Rockwell International Corporation Split phase delay equalizer with single transformer and adjustment for Q loss

Also Published As

Publication number Publication date
US2231079A (en) 1941-02-11

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