GB385521A - Improvements in or relating to radio direction finding apparatus - Google Patents
Improvements in or relating to radio direction finding apparatusInfo
- Publication number
- GB385521A GB385521A GB15222/32A GB1522232A GB385521A GB 385521 A GB385521 A GB 385521A GB 15222/32 A GB15222/32 A GB 15222/32A GB 1522232 A GB1522232 A GB 1522232A GB 385521 A GB385521 A GB 385521A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- oscillator
- aerial
- phase
- directional
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
385,521. Directive wireless signalling. AGA-BALTIC RADIO AKTIEBOLAGET, 13, Kungsgatan, Stockholm. May 28, 1932, No. 15222. Convention date, May 30, 1931. [Class 40 (v).] A directional wireless system comprises a transmitter with a directional and a non- directional aerial system, the former producing a rotating beam of angular velocity corresponding to the low modulation frequency of the signals in the latter, or a harmonic thereof, the direction of the transmitter being indicated at the receiver by the phase difference between the low-frequency modulations received from the two systems. In one embodiment a lowfrequency generator LFG, Fig. 1, modulates at LFM the radio frequency produced by oscillator O1 and supplied to a non-directional aerial A. The oscillator 02 of a different radio frequency supplies the crossed loop aerials R1, R2 with energy modulated by the same low.frequency from the generator LFG, the modulating currents being two components, 90‹ out of phase, produced by the phase-splitting device FF and applied to the two carrier-suppressing modulators M1, M2 individual to the aerials R1, R2 respectively. This results in a rotating beam being radiated from the system R1, R2, the relative phases of the low-frequency-modulations from the two systems A and R1, R2 received at any point, being dependent on the direction of the receiver relative to the transmitter. To remove the 180‹ ambiguity, some of the energy from oscillator 02 may be applied to the non-directional aerial A, Fig. 4 (not shown). The complete valve circuits for this embodiment are described, Fig. 5 (not shown). In another embodiment, a common carrier frequency is used from oscillator O, Fig. 6, with different intermediate modulation frequencies for the two aerial systems produced by generators MFG1, MFG2. The low frequency generator LFG modulates the intermediate frequency from MFG1 at LFM, the resultant currents modulating the radio frequency from O at MFM3 for the non-directional aerial while the two phase-displaced components from FF modulate the intermediate frequency generator MFG2 and the carrier from O through channels M1, MFM1, and M2, MFM2, respectively for the two directional aerials. The ambiguity-removing energy is applied to the transformer T in the non-directional aerial circuit from a modulator MFM4 supplies from oscillators O and MFG2. In a further embodiment, the low frequency modulations are produced by a mechanical rotary transformer RT, Fig. 7, with a fixed winding S supplied with radio frequency current from oscillator 02. The two mutually perpendicular windings comprising the rotor, rotate at a suitable frequency and supply modulated currents to the two aerials RI, R2 through amplifiers F1, F2, an equalizing device FU being interposed between the latter: The motor M driving the rotary windings of transformer RT also drives a low frequency generator G supplying currents to modulate oscillator O1 in modulator LFM for supplying the aerial A, ,which also receives oscillations from oscillator 02 through amplifier F3 and transformer T, for removing the 180‹ ambiguity. In a further embodiment a multiple frequency generator MG, Fig. 8, provides harmonic frequencies a, a + 1, b -1, b, and b + 1, a and b being arbitrary values essentially differing from one another. The frequencies a, a + 1, and b are used to energize the aerial A, and the frequencies b - 1 and b + 1 are applied to phase-splitting filters FF1 and FF2 respectively so that from each are produced two currents with a 90‹ phase difference between them which are applied to the aerials RI, R2 as shown to produce-the rotating field. At the receiver, when two' carrier frequencies are used, two receiving aerials and detectors are employed, the outputs from the latter being fed to a phase indicator which indicates the direction of the transmitter. When a single carrier frequency is used the receiver comprises a single aerial followed by a detector, two intermediate frequency filters and two detectors feeding the phase indicator. Specification 357,640 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE385521X | 1931-05-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB385521A true GB385521A (en) | 1932-12-29 |
Family
ID=20309237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15222/32A Expired GB385521A (en) | 1931-05-30 | 1932-05-28 | Improvements in or relating to radio direction finding apparatus |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE576862C (en) |
FR (1) | FR737770A (en) |
GB (1) | GB385521A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2551828A (en) * | 1944-02-05 | 1951-05-08 | Hartford Nat Bank & Trust Co | Radio beacon |
US2596537A (en) * | 1944-02-04 | 1952-05-13 | Hartford Nat Bank & Trust Co | Rotating radio beacon |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE767368C (en) * | 1939-06-20 | 1952-06-19 | Lorenz A G C | Method for determining direction by means of rotating directional radiation |
DE1075684B (en) * | 1956-08-03 | 1960-02-18 | Svenska Aktiebolaget Gasaccumulator Lidmgo (Schweden) | Talking radio beacon |
-
1932
- 1932-05-25 DE DEA66063D patent/DE576862C/en not_active Expired
- 1932-05-28 GB GB15222/32A patent/GB385521A/en not_active Expired
- 1932-05-28 FR FR737770D patent/FR737770A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2596537A (en) * | 1944-02-04 | 1952-05-13 | Hartford Nat Bank & Trust Co | Rotating radio beacon |
US2551828A (en) * | 1944-02-05 | 1951-05-08 | Hartford Nat Bank & Trust Co | Radio beacon |
Also Published As
Publication number | Publication date |
---|---|
FR737770A (en) | 1932-12-16 |
DE576862C (en) | 1933-05-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB452235A (en) | Improvements in or relating to methods of and apparatus for ascertaining location or distance by radio-electric signalling | |
GB594532A (en) | Improvement in omnidirectional radio navigation-aiding systems | |
US1988006A (en) | Direction finding system | |
US2129004A (en) | Radio signaling | |
US2414431A (en) | Radio beacon | |
GB385521A (en) | Improvements in or relating to radio direction finding apparatus | |
US2014732A (en) | Radio beacon system | |
US2433351A (en) | Radio beacon | |
GB357640A (en) | Improvements in or relating to radio direction finding systems | |
US2107155A (en) | Radio directional indicator | |
US2404501A (en) | Radio beacon system | |
GB578479A (en) | Improvements in or relating to radio navigational systems | |
US2420605A (en) | Frequency modulated rotating radio beacon | |
GB947306A (en) | Improvements in and relating to signal modulating apparatus | |
US2314795A (en) | Radio range | |
US1708518A (en) | Communication system | |
US1854733A (en) | Radio beacon | |
GB535396A (en) | Improvements in radio transmitters | |
US2509230A (en) | Beacon system | |
GB700601A (en) | Localiser beacon system | |
US2566154A (en) | Radio guidance system | |
US2121024A (en) | Radio transmitting and receiving system | |
US2018356A (en) | Transmission of related radiant frequencies | |
GB734625A (en) | Improvements relating to speaking radio beacons | |
US3051950A (en) | Arrangement in speaking radio beacons |