Патент USA US2406970код для вставки
_Sept- 3, 1946- _ J. P. sMm-l 2,406,970 RADIO PULSE INDICATOR > Filed Nov. 29; 1941 atm-neg x 2,406,97 Patented Sept. 3, 1946 ATENT QFFICE> UNITED Efi‘Ai'I'ES` 2,406,970 RADIO PULSE INDICATOR John> P; Smith,` Erlton, N. J'., assignol: to Radiol Corporation of America, afcorporation of Dela Ware Application Nevemter 29, 1941, serial No. 420,919 6 Claims. (o1. 315-24.) 1 ject is-to provide means for blanking automati This invention` relates to improvements in cally a cathode ray timing trace for all but the radio pulse indicators,A and4 particularly to a portion including the received signal. Another cathode ray timing indicator in which the tim object is to provide mea-ns in a pulse receiver and ing> ray moves at a high angular rate compared indicator whereby any one of a plurality of'sig tothe repetition rate of the pulses to be timed. nals may be selected while undesired signals In the copending applications Serial> No.. 420, may be blanked, thus to increase the signal-»to 944 ñled November 24, 1941, by Woliï and Holmes, noise ratio and the visibility of the desired and Serial. No` 420,928 ñled by Holmes and signals. Smith, on. November> 29, 1941, radio pulse posi The invention will be described by referring tion indicating systems are described. In such 10 to the accompanying drawing, in which» Figure systems, pairs of> spaced pulses- are radiated in` 1 is a schematic diagram of one embodiment' of predetermined time relation from transmitters the invention, and Figure 2` is a diagram of a at- known'v positions. The differences in the times clipper circuit employed in the invention. required for the several pairs of. pulses to travelA Referring to the drawing, the input of a pulse from the. transmitters to the receiver at an un 15 receiver l is connected to an antenna 3; the known` position may be used to fix the pointl of receiver output is connected to a. delay network reception with respectl to the known positions. 5. The. received signals are passed through the Ii the distances from: theV transmitter to,> the re delay network and hence to one branch of the ceivers'are of the order’ of several hundreds- of miles, it is` necessary to use a pulse repetition 20 input circuits of three discriminators 1, 9` and ll. The other branches of the input circuits of the rate‘which is low enough. to permit the first pulse discriminator circuits are connected to portions to travel. the maximum. range before the nextY of the required time delay of the network 5 so pulse starts. At the same time, if high accuracy that spaced pulses A, B and C may be coinci is desired, it is necessary to provide a relatively high timing rate» in the indicator'so that`> the in.-` 25 dentally applied to the discrimi-nators. Thus selectively delayed, the pairs of pulses appear in dications of received. signals will be spread out the output of the respective discriminators as and differences in time of` signal arrival of a single pulses A', B’ and C'. One of the single microsecond or' less will be indicated. By way pulses is applied to a dilïerential bias circuit I3 of example, the repetition rate of a pair of pulses maybe 331/3 per secondi which corresponds 30 which is used for synchronizing and stabilizing to a maximum range of over 5000 miles, andthe timing rate may be of the order of 200i rotations the frequency of a master oscillator l5 as hereina after described. The master oscillator includes a reactor thermionic tube or its equivalent for per second for the main indicator, 2,000> rota-tions controlling the phase and frequency of the local per second for the ñrst Vernier and 20,000 rota-V tions per second for the second Vernier, if decade 35 oscillations. The local oscillations may have a frequency of 20 kilocycles per second, or any scales are desired. Other timing ratios may be rate of the order of the angular velocity of the used; for example, the main and> Vernier timers» Vernier timing device. may bear a ratio of 1 to 100. At even the slow The local oscillations- are applied through an est rate, the cathode ray timing beam will ro tate 200 times for one radial deflection effected 40 amplifier I'l to a deflecting circuit I9 which in cludes a phase splitter. The phase splitter pro by the received signal. The timing beam will vides currents of quarature phase for deflecting leave such a bright trace that it will be difficult the ray of' the Vernier' indicator cathode ray to- distinguish the radial traces due to the re tube Z‘I‘. The amplifier output is applied through ceived signals. The diñiculty increases with the 45A three frequency counters or frequency dividers faster timingl traces; 23, 25, 2T.. The intermediate counter 25 pro This diiiiculty is solved, as described in the vides currents of 200 cycles per second, which cited Holmes and Smith application, by em are applied to a second deflecting circuit 29. ploying a manually operated blanking or signal The second deñecting circuit 29 includes a phase selecting system in which thel timing trace isy blanked out for all but a brief period including 50 splitter whose output is applied to the deñecting electrodes of the main cathode ray tube 3l to the radial signal deñection. According to one rotate its ray at one one-hundredth of the ro of the objects of the instant invention, means tational rate of the timing ray of the Vernier in are provided for the automatic selection of the dicator 2l. portions of the timing trace or traces which in The output from any one of the discriminators clude the radial deflection signal. Another ob 55 2,406,970 . „ 1, 9, || may be selected by push buttons 33, 35, „ f.. ments, a grid electrode, a radial deflecting elec 31 and applied to the grids 39, 4| of the Vernier and main indicators 2|, 3|. j 4 3 trode and a cathode ray source, means including' Biasing means such said deñecting elements for sweeping said ray as batteries 43, 45 are included in the grid cir cuits, so that the rays may be normally biased off their respective fluorescent screens. The selected discrimi-nator output is also applied te a clipper circuit 41 Yand hence in the proper phase screen, a source of pulses to be timed, means for chronized by selecting the single pulses derived radially on said screen. at a predetermined timing rate, means including said grid electrode for blanking said ray off said applying said pulses to said grid electrode to apply said ray to said screen, and means for ap to the radial deñecting electrodes 49, 5| of the plying said pulses to said radial deiiecting elec cathode ray indicators 2| and` 3|. 10 trode simultaneously with said application of said The local master oscillator I5 may be syn- 'Y 'pulses to said grid electrode to deflect said ray preferably from the ñrst received pair of pulses 3. A pulse indicator including a cathode ray and by applying the selected pulse to the di?fer- i tube having a fluorescent screen, a radial deflect-Y ential bias circuit I3. The output of the-final l5 ing electrode, a grid electrode and a cathode ray counter'21 is also applied to the differential bias source, means for rotating said cathode ray at circuit. In this arrangement, the output of the a predeterminedtiming rate, means including diiîerential bias circuit is zero orv constant, pro said grid electrode for blanking said ray off said vided the phase of the pulses and local current screen, asource of pulses to be indicated, means is constant. If the phase or frequency changes, 20 for applying Vsaid pulses to said grid electrode to the diiîerential bias circuit output changes. `The overcome said blanking means and to apply said changing output current provides the control ray to said screen, and means for applying said potential for the reactance device which syn pulses to said radial -deiiecting electrode simul chronizes and stabilizes the master oscillator. taneously with said application of said pulses to' Thus the master oscillator is locked to theV in coming sig-nals. 1 25 said grid electrode to deflect said ray radially on said screen. ' ~ In the operation of the device, it should be 4. An indicator for timing pulses including a understood that single pulses may be used in cathode ray tube having a fluorescent screen, a stead of pairs of pulses by omitting the delay grid electrode, a radial deflecting electrode, and network 5 and discriminator circuits 1, 9 and | I. 30 a source of cathode rays, means for sweeping said» In either event, thebeam of the main cathode rays at a predetermined timing rate, means for ray tube 3| is driven at a relatively slow speed blanking said rays ,off said screen, means for and the beam of the Vernier tube 2| is driven applying said pulses to said grid electrode to at a relatively high speed. Both beams are ro overcome said blanking means and to apply said tated in synchronism with the local master os cillator currents and in phase with the incom ing pulse signals. The rotating beams are biased off their respective iluorescent screens by the rays to said screen, means for shortening and for shaping said pulses, and means for applying said shortened and shaped pulses to said radial de fleeting electrode simultaneously with said appli steady grid biases 43 and 45. vWhen any one of cation of said pulses to said grid electrode to the push buttons 33, 35 and 31 is operated to 40 deiiect said ray radially on said screen. apply the incoming pulse signals to the grids 39 and 4|, the steady bias is overcome momentarily and the rotating beams are applied to their re spective screens. At the same time, the incom ing pulse signals are applied to the clipper or pulse shortening circuit, which may be a clipper or limiter tube (see Figure 2). The limiter picks off the upper and narrower portion of the pulses A', B' or C' and applies the selected peak to the radial deflecting electrodes 49 and 5I to deñect the beams radially. The signal deiiection occurs during the short interval when the beams are biased onto the screens, and thus the arcuate and radial traces are of substantially-the same brilliance. Y I claim as my invention: 1. A pulse indicator including a cathode ray tube having a fluorescent screen, a grid electrode, 5. An indicator for timing pulses including a cathode ray tube having a iluorescent screen, deflecting elements, a grid electrode, a radial de iiecting electrode and a cathode ray source, means 1 including said deiiecting elements for sweeping said ray at a predetermined timing rate, means for blanking said ray‘off said screen, a source of pulses to be timed, means for applying said pulses to said grid electrode to apply said ray to said screen, means connected to said pulse source for shortening said pulses, and means for ap plying said shortened pulses to said vradial de ñecting electrode simultaneously with said ap plication of said pulsesv to said grid electrode to deflect said ray radially on said screen. 6. An indicator for timing pulses including a cathode ray tubel having a iiuorescent screen, a radial deiiecting electrode, a grid electrode and a a radial deflecting. electrode, and a source of cathode ray source, means for rotating said cath cathode rays, means for sweeping said rays at a predetermined timing rate, means for blank 60 lode ray at a predetermined timing rate, means for blanking said ray 01T said screen, a source of ing said rays off said screen, means for applying pulses to be timed, means for applying said pulses pulses to be indicated to said grid electrode to overcome said blanking means and to apply said rays to said screen, and means for applying said pulses to said radial deñecting electrode simul taneously with said application of said pulses to said grid electrode to deflect said ray radially on said screen. ' 2. A pulse indicator including a cathode ray tube having a ñuorescent screen, deñecting ele 70 to said grid electrode to overcome said blanking means and to apply said ray to said screen, means connected to said source for shortening said pulses, and means for applying said shortened pulses to said radial deilecting electrode to deflect said ray radially on said >screen during the appli cation of said pulses to said grid electrode. JOHN P. SMITH.