GB601733A - Improvements in or relating to object-locating or -detecting systems - Google Patents
Improvements in or relating to object-locating or -detecting systemsInfo
- Publication number
- GB601733A GB601733A GB1463545A GB1463545A GB601733A GB 601733 A GB601733 A GB 601733A GB 1463545 A GB1463545 A GB 1463545A GB 1463545 A GB1463545 A GB 1463545A GB 601733 A GB601733 A GB 601733A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- section
- time
- base
- valve
- 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
- 230000001629 suppression Effects 0.000 abstract 2
- 241001646071 Prioneris Species 0.000 abstract 1
- 230000003111 delayed Effects 0.000 abstract 1
- 230000001419 dependent Effects 0.000 abstract 1
- 239000003550 marker Substances 0.000 abstract 1
- 230000000051 modifying Effects 0.000 abstract 1
- 230000001702 transmitter Effects 0.000 abstract 1
- 230000001960 triggered Effects 0.000 abstract 1
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)
- Geophysics And Detection Of Objects (AREA)
Abstract
601,733. Radiolocation saw-tooth generating circuits. WATSON, D. S., LAWS, C. A., and BUCKINGHAM, J. June 8, 1945, No. 14635. [Classes 40 (vi) and 40 (vii)] A cathode-ray tube radar indicator with a type A scan is provided with means for increasing the speed of a small section of the time-base, a calibration mark generator, and gating.means for allowing only the calibration mark occurring in the expanded part of the sweep to provide an indication on the tube. Synchronizing pulses from the radar transmitter are applied over condenser C1 to amplifier V1 and the output applied to single-stroke multivibrator V2. A positive pulse from anode '' a " of this valve is fed to the suppressor grid of V4, which is an anode-grid coupled time-base generator, and the time-base sweep is applied to the X1 plate of the cathode-ray tube and also to the grid of " b '' section of cathode coupled double triode V6. The potential of the grid of the '' a " section of this valve is controlled by coarse ranging potentiometer P and when the sweep potential applied to the " b '' grid falls through the " a " grid potential, the current through the valve changes over from the '' b " to the " a " section and a negative pulse is passed to the grid of V7. This pulse is delayed after the start of the time-base by an amount determined by the setting of P and initiates the expanded sweep. V7 is normally conducting, but is driven to cut-off by the applied negative pulse, the anode potential rises as the anode-earth capacity charges up through R9, providing the fast sweep which is applied to the X2 plate of the tube. The negative pulse from V6 is also fed through a network providing a delay of half the duration of the expanded section of the time-base to V9 which passes a positive pulse to gate valve V19 at the centre of expanded time-base. The calibration marker generator is triggered by a negative pulse derived from the b section anode of V2; this is used to suddenly cut off valve V10 and cause ringing circuit L3 and C14-16 to oscillate. Oscillations are applied to cathode follower stage V11 and then applied to V12 which feeds signals back to coil L4 to maintain oscillation. In order that oscillation shall not be continuous, V12 is normally cut off by suppressor grid bias, but is allowed to function by a positive pulse applied from the " a " section of V2 at the same time as V10 is cut off. The feed-back resistor R15 is adjusted to maintain oscillation. V11 also feeds a second cathode follower V13 which is' transformer coupled to phase-shifting networks which feed in quadrature the two field coils F1 and F2 of a goniometer. The phase of the output of the search coil is dependent on the coil's position and this provides the vernier range control which may be linked with the coarse control. The search coil output.is fed to amplifier V14, to squaring and amplifying valve V15, and then to V17 which produces short positive calibration pulses from the squared wave. These are applied to the grid of gate valve V19, but only the one occurring near the centre of the expanded section of the time-base is allowed, by the positive pulse from V9, to pass on to provide either light or dark spot modulation of the trace. Specification 583,475 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US764811A US2552022A (en) | 1945-06-08 | 1947-07-30 | Expanded sweep and calibrated marker for cathode-ray tube trace |
Publications (1)
Publication Number | Publication Date |
---|---|
GB601733A true GB601733A (en) | 1948-05-12 |
Family
ID=1730894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1463545A Expired GB601733A (en) | 1945-06-08 | 1945-06-08 | Improvements in or relating to object-locating or -detecting systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB601733A (en) |
-
1945
- 1945-06-08 GB GB1463545A patent/GB601733A/en not_active Expired
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