GB585909A - Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signals - Google Patents
Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signalsInfo
- Publication number
- GB585909A GB585909A GB175440A GB175440A GB585909A GB 585909 A GB585909 A GB 585909A GB 175440 A GB175440 A GB 175440A GB 175440 A GB175440 A GB 175440A GB 585909 A GB585909 A GB 585909A
- Authority
- GB
- United Kingdom
- Prior art keywords
- milliseconds
- pulses
- timing
- modulated
- operative
- 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
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/20—Cathode-ray oscilloscopes
- G01R13/22—Circuits therefor
- G01R13/28—Circuits for simultaneous or sequential presentation of more than one variable
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Particle Accelerators (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
585,909. Radiolocation. WHITE, E. L. C. Jan. 29, 1940, No. 1754. [Class 40 (v)] [Also in Group XXXVI] In a cathode-ray oscillograph for simultaneously observing two or more signals of the same wave form and amplitude but differing in timing, modulating means are arranged to vary the intensity of the ray during the production of one of the wave traces so that it may be identified. Apparatus is shown for determining the bearing of an object by the reflection of electromagnetic waves. A transmitter 2 is modulated by a pulse generator 1 so as to radiate a burst of short waves lasting 0.5 millisecond once every 200 milliseconds. The reflected signals are received on three aerials 3, 4, 5, each of which is coupled to its associated amplifier 3a, 4a, 5a. The outputs of those amplifiers are connected in parallel and fed to further amplifying and detecting stages in a receiver 6, the output of which is connected to the input of adjustable delay networks 3b, 4b, 5b. The output of these networks is connected to one pair of deflecting plates 7a of a cathode-ray oscillograph 8a and to one pair of deflecting plates 7b of a cathoderay oscillograph 8b. To the other pair of plates 9a, 9b is supplied a saw-tooth scanning waveform derived from a saw-tooth generator 10 controlled by the pulse generator 1. A generator 11 generates an oscillation having a rectangular waveform and a frequency of 250 cycles per second. This signal is divided by a divider 12 to produce a further oscillation having a frequency of 25 cycles per second which is fed to a device 13 so as to generate three series of pulses having a duration of 40 milliseconds and recurring every 120 milliseconds. The device 13 may comprise a series of commutators on a shaft rotated under control of the output from the divider 12. The series of pulses are arranged to differ in timing by 40 milliseconds. One series of pulses is fed to each of the amplifiers 3a, 4a, 5a so that each channel, comprising an amplifier, delay network and the receiver 6, is rendered operative for 40 milliseconds in succession. Traces corresponding to the waveform of the signals received on each of the aerials 3, 4, 5 appear in turn on the oscillographs 8a, 8b and their timing may be adjusted by the delay networks 3b, 4b, 5b. The cathode rays of the oscillographs 8a, 8b are modulated differently during the successive 40 millisecond periods so that each trace is given a characteristic marking. during the successive 40 millisecond periods so that each trace is given a characteristic marking. This is effected by biassing the control electrodes 14a, 14b so as normally to black-out the cathoderay beam. They are biassed positively so as to increase the beam current to its normal value by means of a biassing signal derived from the devices 11, 13 and supplied either without modulation when the channel 3a, 3b is operative, or modulated by 250 cycles per second pulses in the modulator 16a when the channel 4a, 4b is operative, or modulated by 250 cycles per second pulses in anti-phase in the modulator 16b when the channel 5a, 5b is operative. One trace, therefore, is continuous while the other two are interrupted alternately so that they can be easily identified and brought into coincidence by adjusting the relative delay in the networks 3b, 4b, 5b. The difference in timing between the signals received on the aerials 3, 4, 5 is given in terms of the time delay introduced into the three channels, and the bearing of the reflecting object is then determined. Specification 585,908 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB175440A GB585909A (en) | 1940-01-29 | 1940-01-29 | Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB175440A GB585909A (en) | 1940-01-29 | 1940-01-29 | Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signals |
Publications (1)
Publication Number | Publication Date |
---|---|
GB585909A true GB585909A (en) | 1947-02-28 |
Family
ID=9727401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB175440A Expired GB585909A (en) | 1940-01-29 | 1940-01-29 | Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB585909A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2951985A (en) * | 1954-09-28 | 1960-09-06 | Sperry Rand Corp | Apparatus for monitoring a recurring pulse group |
US3267933A (en) * | 1962-09-10 | 1966-08-23 | Del Mar Eng Lab | Ekg computer |
US4680620A (en) * | 1986-03-06 | 1987-07-14 | Tektronix, Inc. | Measurement of SC/H phase using a subcarrier time mark generator and a calibrated phase shifter |
-
1940
- 1940-01-29 GB GB175440A patent/GB585909A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2951985A (en) * | 1954-09-28 | 1960-09-06 | Sperry Rand Corp | Apparatus for monitoring a recurring pulse group |
US3267933A (en) * | 1962-09-10 | 1966-08-23 | Del Mar Eng Lab | Ekg computer |
US4680620A (en) * | 1986-03-06 | 1987-07-14 | Tektronix, Inc. | Measurement of SC/H phase using a subcarrier time mark generator and a calibrated phase shifter |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2509207A (en) | Signal comparison system | |
US2207267A (en) | Radio apparatus for detecting aircraft | |
GB585357A (en) | Improvements in or relating to method of and apparatus for surveying objects with electromagnetic energy | |
GB592617A (en) | Improvements relating to radio detection systems for measuring the distances of obstacles | |
GB581241A (en) | System for locating a radiated-signal reflector | |
GB592577A (en) | Improvements relating to calibration arrangements for oscillographs and their application to radio obstacle detection systems | |
US4045766A (en) | Ultrasonic detection system | |
GB622173A (en) | Improvements in or relating to arrangements for producing spiral traces on cathode ray tubes | |
US2438987A (en) | Radio navigational aid | |
GB585909A (en) | Improvements in or relating to oscillographic methods and apparatus for the observation and/or measurement of recurrent signals | |
US3024441A (en) | Sector scan indicator | |
US2572788A (en) | Frequency meter | |
US2608652A (en) | Pulse analyzing method and system | |
US3284659A (en) | Apparatus and method for combining "a" and "b" type displays on an oscilloscope having a "b" type sweep circuit | |
US2634410A (en) | Radar beacon delay standardization system | |
GB592575A (en) | Improvements in or relating to arrangements for delaying electric pulses | |
GB593467A (en) | Arrangements for transmitting and receiving short electric pulses | |
US2737653A (en) | Independent electronic range strobe and azimuth cursor | |
US2414537A (en) | Indicator for radio pulse-echo systems | |
US2570203A (en) | Distance finding system with means to eliminate selected indications | |
US2621306A (en) | Time-delay circuit | |
US2852769A (en) | Time interval multiplier | |
US2570235A (en) | Device for measurement of the distances of obstacles | |
US3092804A (en) | Phase analyzer | |
US2860332A (en) | C scan for cathode ray tubes |