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Патент USA US2406970

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_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.
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