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Патент USA US2403890

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JOHN KE LY JOHNS
BY
ATT RNEY
.
July 9, 1945-
2,403,890
J. K- JOHNSON
TELEMETERING SYSTEM
Filed Aug. 24, 19415
45
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2,403,890
Patented July 9, 1946
UNITED STATES PATENT OFFICE
2,403,890
TELEMETERING SYSTEM
John Kelly Johnson, Douglaston, N. Y., assignor,
by mesne assignments, to Hazeltine Research,
Inc., Chicago, Ill., a corporation of Illinois
Application August 24, 1943, Serial No. 499,770
1.6 Claims. (Cl. 177-351)
1
2
points for each of these meters. The system also
comprises means operating synchronously with
the aforesaid scanning means for developing
electrical synchronizing signals of a diiferent
type, means operating synchronously with the
transmitting the developed signal for reproduc
above-mentioned scanning means for developing
tion at a remote point.
meter-reference signals having an electrical
An important application of telemetering in
characteristic rendering them separable from
volves the determination of the progress of an
the above-mentioned signals, and means for com
airplane in flight by deriving information from
the meters on its instrument board and trans 10 bining the signals into a composite signal for
transmission.
mitting that information for reproduction at a
In accordance with another feature of the in
control station which is generally remote from the
vention, a, telemetering system of the above-men
airplane. For such purposes, it is particularly
tioned type additionally comprises means for
desirable, and often imperative, that the weight
and physical dimensions of the telemetering 15 transmitting the composite signal to a remote
This invention relates to a telemetering system
and more particularly to a telemetering system
for developing a composite signal representative
of the indications of a plurality of meters and
equipment on the aircraft be kept to a minimum.
It is, therefore, expedient to use existing radio
transmitters for sending this information to the
point, a signal-reproducing means at the remote
point, and means for utilizing the above-men
tioned synchronizing signals to synchronize the '
reproducing means. Means responsive to the
control station, thereby to effect a reduction in
weight and in cost. Corresponding savings also 20 above-mentioned meter-reference signals is em
ployed for effectively separating the reference
result at the receiving station of such a system.
and indication signals corresponding to each of
The use of conventional transmitters and re
the meters from the composite signal. The ar
ceivers does, however, demand a telemetering sig
rangement also includes means for applying each
nal or signals which can be translated within the
audio-frequency band.
Telemetering systems employing conventional
of the corresponding separated reference and in
dication signals to the reproducing means for `
reproduction.
television principles have been proposed, but are
For a better understanding of the present in
limited in their application because of the exten
vention, together with other and further objects
sive space requirements for the rather elaborate
equipment which is necessary and also because of 30 thereof, reference is had to the following de
scription taken in connection with the accom
the need for a wide transmission band. Further
panying drawings, and its scope will be pointed
more, the range of transmission at the frequen
out in the appended claims
cies employed in television systems is limited to
In the accompanying drawings: Fig. 1 is a
the line-of-sight distance between the transmit
circuit diagram in schematic form of the trans
ter and receiver, which distance is relatively small
mitter portion of the telemeterlng system of the
in comparison with the range of modern aircratlt.
invention; Figs. 1a. and 1b, respectively, repre
It is an object of the invention, therefore, to
sent the meter faces of the Fig. 1 arrangement;
provide an improved telemetering system which
Fig. 2 is a circuit diagram of the receiver portion
avoids one or more of the above-mentioned dis
advantages of the arrangements which hereto 40 of the systems; Figs. 2a and 2b, respectively, rep
resent portions of the reproducing system of the
fore have been employed,
receiver of Fig, 2; while Fig. 3 comprises graphs
It is another o‘bject of the invention to provide
showing the character and timing of the signals
a telemetering system which is particularly well
developed in various units of the telemetering
adapted for use with conventional audio-signal
arrangement.
radio transmitters and receivers.
Referring now to Fig. 1, there is shown a tele
It is a further object of the invention to pro
metering system for developing a composite sig
vide a telemetering system including transmis
nal representative of the indications of a plural
sion and receiving equipment which is compara
ity of meters. The system comprises a scanning
tively light in weight and compact in design.
In accordance with a feature of the invention, 50 means for developing successive electrical signals
of one type representative of reference and indi
a telemetering system for developing a composite
cation points for each of the meters of the system.
signal representative of the indications of a plu
The portion- of this last-named means which is
rality of meters comprises scanning means for
provided for developing the signal representative
developing successive electrical signals of one
type representative of reference and indication 55 of the indication of one of the meters I2 comprises
2,403,890
3
a mechanical means I0 for electrically scanning
an indicator II of the meter I2 by movement of
the scanning means relative to the meter indi
cator. The means IIl comprises a rotary support
I3 which is positioned adjacent the indicator II
4
described is also similar to that shown in the
above-mentioned application of vMichael J. Di
Toro.
The arrangement of Fig. 1 also includes means
7.1 dependent upon the scanning means driven by
motor I4 for developing electrical synchronizing
signals of a polarity opposite to that of the refer
ence and indication signals described above and,
tration, this mechanical coupling is indicated by
therefore, of a different type. This last-named
the broken line I6. Radially disposed winding
means I1, which preferably comprises one or more 10 means also includes the driven indicator 35 and
associated elements, oscillator 40 and detector
coils of a material such as copper, is mounted on
4I, as Well as a differentiating circuit in wave
the rotor I3 with the axes of the several portions
shaping network 42', so that, for a single pulse
thereof substantially parallel to the shaft I5.
applied to the input circuit thereof, a negative
The winding means I1 is electrically connected to
a condenser I3 and to a winding 20 which is se 15 output pulse is obtained corresponding to the
leading edge of the input pulse and a positive
cured on rotor I3 to form a series-resonant or
output pulse is obtained corresponding to the
tuned circuit. A stationary Winding 22 is dis
trailing edge of the input pulse. Such diiîeren
posed adjacent winding 20 in a manner to provide
tiating networks are well understood by those
a magnetic coupling between the electrical scan
ning means including windings I1 and a means 20 skilled in the art, rendering a further description
for supplying oscillations thereto comprising an
thereof unnecessary.
oscillator 23. Across the leads to stationary wind
The arrangement of Fig. 1 also includes means
ing 22 there exists an inherent capacitance rep
operating synchronously with the scanning means
resented by dotted condenser 22’. Winding 22
driven by motor I4 for developing meter-refer
and capacitance 2.2' form a parallel-resonant 25 ence signals having an electrical characteristic
circuit. The telemetering arrangement for scan
rendering them separable from any of the signals
of the meter I2 and which is driven by a motor
I4 coupled to a shaft I5. To simplify the illus
ning meter I2 also comprises a means for deriv
mentioned above. This last-named means com
ing a signal in response to the infiuence of the in
prises a meter-reference signal generator or os
dicator II at the position of the indicator on the
cillator 21 adapted to be keyed into operation
dial of the meter. This means comprises a de 30 by a keying unit 26. A wave-shaping network 28
tector 24 of conventional design which is con
is coupled to the output circuit of oscillator 21.
nected to the scanning means I0 through the os
cillator 23 and the stationary winding 22. The
meter indicator II has attached thereto a small
Meter-reference signal oscillator 21 preferably
generates signals which are of a 'substantially
higher repetition rate than any of the signals
strip 26 of material having a high-resistivity, 35 generated by the elements described above.
high-permeability characteristic. The scanning
The system of Fig. 1 also includes means for
means I0 and its associated elements as so far
combining the above-mentioned signals into a
described are identical with corresponding ele
composite signal for transmission. A commu
ments described and claimed in United States
tator or distributor device 44 is provided for con
application Serial No. 499,769, filed August 24, 40 necting certain of the above-mentioned signal
1943, in the name of Michael J. Di Toro, and cor
generators to an input circuit of a signal mixer
responding reference numerals indicate similar
device 43 only at predetermined required times.
elements in the two disclosures insofar as the
scanning means I0 is concerned.
Similarly, there is provided an arrangement for
The mixer 43 is preferably so designed as to limit
the amplitudes of the components of the com
developing successive electrical signals repre
ence signal and meter-indication signals to a pre
determined value. The distributor device 44 com
posite signal corresponding to the meter-refer
sentative of the indication of a second meter I2’.
This last-named arrangement comprises a simi
prises a shaft adapted to be driven by motor I4
lar group of elements including a meter I2', a
at one-third the speed of scanning device III
50
scanning device IU', an oscillator 23' and a de
through a gear reduction device 9. Motor I4 thus
tector 24'.
comprises a common driving means for the scan
The telemetering arrangement of Fig. 1 in
ning devices I0 and Ill’ and the distributor de
cludes also means operating synchronously with
vice 44. Connected to the shaft of distributor 44
the scanning means I0 and I0’ for developing
is a brush 45 which makes contact between con
electrical reference signals for each of the meters. 55 ductive segments of two concentric stationary
This means comprises a rotatable indicator 35
rings. The inner stationary ring comprises con
for electrically scanning a fixed reference point.
ductive segments 46 and 41 and insulating seg
The ñxed .point is established by a pair of Wind
ings 36, 36 provided with powdered iron cores 31,
31 and disposed on a stator or support 38.
ments 48 and 49, while the outer stationary ring
comprises conductive segments 50, 5I and 52 and
The 60
indicator 35, which is preferably similar to the
above-described indicator II, is driven by the
insulating segments 53, 54 and 55. The output
circuit of detector 24 is connected to conductive
segment 5I on the outer ring and the arrange
ment is such that the signal output of detector
connection being represented by the broken line
39. The rotary scanning means I0 and the indi 65 24 can be translatedthrough the brush 45 and
conductive segment 41 to the input circuit of a
cator 35, therefore, have corresponding move
wave-shaping network 56, the output circuit of
ments relative t0 the stationary elements. Across
which is in turn coupled to an input circuit of
the leads to windings 36, 36 there exists an in
mixer 43. Similarly, the output circuit of de
herent capacitance represented by the dotted
condenser 36’. Windings 36, 36 and equivalent 70 tector 24’ is coupled to conductive segment 52
and the signal output of detector 24' can thus
condenser 36' form a parallel-resonant circuit.
be translated through conductive segment 41 to
The windings 36 are connected in circuit with an
the input circuit of wave-shaping network 56.
oscillator 40, a detector 4I and a signal-shaping,
reversing and differentiating network 42’. The
The output circuit of detector 4I is coupled to an
motor I4 in a conventional manner, the driving
reference-signal generator which has just been 75 input circuit of mixer 43 through wave-shaping
2,403,890
5
network 42', while the output circuit of oscillator
21 is also coupled to an input circuit of the mixer
43 through the wave-shaping network 28. The
keying device 26 is of a type adapted to be ener
gized by the completion of a connection to ground
6
vide a narrow pulse indicating signal, as repre
sented by pulse 6I of curve A, this pulse being
translated from the output circuit of network 56
through the mixer 43 to the output terminals of
the system and the amplitude of this pulse pref
erably being limited to a predetermined value by
from an input circuit thereof through the con
ductive segment 46, the brush 45, and the con
mixer 43.
During the portion of the rotation that the
brush 45 bridges conductor 41 and insulating seg
ductive segment 50'y which is grounded.
Reference is made to curve A of Fig. 3 in con 10 ment 55, no circuit is completed through the dis
tributor 44. However, during this interval the
nection 4with the description of the operation of
reference signal or pulse 60” and the synchroniz
the composite-signal generator of Fig. 1.. Curve
ing pulse 64" are generated as described above
A illustrates the signal output obtained from
in connection with reference signal 60 and syn
mixer 43. This signal output comprises negative
reference signals 60, 60’ and 60" and negative
chronizing pulse 64.
During the interval when conductive segment
meter-indication signals 6I and 62 for meter I2
41 and conductive segment 52 are bridged by
and meter I2', respectively. The signal also com
the bar 45, the indicator of meter I2’ is scanned
prises negative meter-reference 'signals 63 of rela
by scanning device IIJ' in a manner identical to
tively high repetition rate and positive synchro
that described above in connection with meter
nizing signals comprising pulses 64, 64’ and 64".
I2 and the indication pulse 62 is derived in the
A linear layout of the commutator arrange
output circuit of wave-shaping network 56. This
-ment 44 is shown just above curve A of Fig. 3
pulse is translated through the mixer 43 to the
and will be used in describing the operation of
output terminals 59 and the amplitude of this
the signal generator of Fig. l. It will be seen.
that` with the brush 45 in the position indicated. 25 pulse is preferably limited to a predetermined
value by mixer 43. During the next operating
only the insulating segments 48 and 54 are
phase of commutator 44, the insulating segments
bridged by the brush. However. the mechanical
48 and 54 are again bridged and the cycle just
phasing of the various mechanically coupled ele~
described begins anew.
ments driven by motor I4 is such that, during
In Fig. 2 there is illustrated the receiver por
this interval, the indicator 35 is driven past the 30
tion of the system of the invention which is suit
windings 36. The effect of this is to cause an
able for visually reproducing the composite signal
amplitude change in the signal output of oscil
output of the Fig. 1 transmitter. 'The receiver
lator 40 due to the fact that the indicator 35,
of Fig. 2 includes a signal-reproducing means
when in proximity with the windings 36, causes
the resistance reflected into tuned circuit 36, 36’ 35 comprising cathode-ray tubes 65 and 66, together
with means for utilizing the synchronizing-signal
to change. The operation of indicator 35 is fully
components of the composite signal to synchro
described in the above-identified application of
nize
these reproducing means. This synchroniz
Michael J. Di Toro, and the amplitude variations
ing arrangement comprises a signal separator 61
thus produced are detected by detector 4I to de
adapted to derive the positive synchronizing
rive a narrow pulse which is applied to the input
pulses 64. 64’ and 64" of the translated composite
circuit of Wave-shaping, reversing and difieren
signal and to supply them to a scanning oscil
tiating network 42’. As above described, unit 42’
lator 68 which is effective to provide a signal out
is such as to provide a negative pulse correspond
put of sine-wave form and of the frequency of
ing to the leading edge of such a signal input
the
synchronizing pulses. The signal output of
45
thereto and a positive pulse corresponding to the
scanning oscillator 6B is applied directly to one
trailing edge of 'such a signal input thereto. The
set of scanning elements or plates 69, 69 of cath
pulse 6U of curve A thus represents the negative
ode-ray tube 65 and is applied with a 90-degree
pulse which is so generated, and the pulse 64 thus
phase shift obtained in a phase shifter 'I6 to a
represents the positive pulse which is so gen
50 second set of deñecting elements or plates 1I, 1I
erated.
in order to cause the cathode-ray beam of signal~
As the brush 45 is driven in a counterclockwise
reproducing device or line-tracing device 65 nor
rotation, conductive segments 46 and 50 are
mally to trace a circle on a fluorescent screen 12
bridged, completing the keying circuit for oscil
of the tube in a manner well understood by those
lator 21, thereby to develop a signal output there
skilled in the art. The cathode-ray tube 66 is
from consisting of a series of high-frequency os 55 similiar to cathode-ray tube 65 and like elements
cillations as indicated at 63 in »curve A. These
bear similar reference numerals with the addi
signals are translated through the mixer element
tion, in each instance, of a prime.
43 to the output circuit for transmission. As
The signal-reproducing means of Fig. 2 also
the brush 45 continues to rotate, insulating seg
comprises means responsive to the meter-refer
60
ments 49 and 53 are bridged and. during this in
ence signal of the composite signal for effectively
terval, the synchronizing-signal generator is
separating the reference and indication signals
again eilective to develop a negative reference
corresponding to each of the meters from all
pulse 60’ and a positive synchronizing pulse 64.'
in exactly the same manner that pulses 60 and
64 were generated. >
other components of the composite signal. This
65 last-named means comprises a signal separator
13 for effectively deriving the negative compo
During the next phase of distributor action,
nents of the composite signal and for providing
conductive segments 41 and 5I are bridged and,
at its output terminals these separated compo
during this interval. the meter indicator II is
nents with a positive polarity. Coupled to the
scanned by the driven windings I1, I1, thereby to
output circuit of signal separator 13 is a signal
70
modulate the signal output of oscillator 23 in a
shaping network 14 which includes an integrat
manner similar to that described above and
ing network adapted to respond only to the rela
which is fully explained in the above-identified
tively large energy content of the meter-refer
application of Michael J. Di Toro. This ampli
ence signal and which includes also a following
tude-modulation is detected by detector 24 and
differentiating network effective to derive a pulse
75
is shaped in wave-shaping network 56 to pro
2,403,890
7
to respond mainly to the greater energy content
of the meter-reference signals 63 thereby to
corresponding in timing to the trailing edge of
the signal derived by integration. These circuits
provide a voltage of the wave form of curve D,
which voltage is differentiated in the differentiat
ing circuit included in the network 14 to pro
vide a sharp negative signal corresponding to
the trailing edge of the broad pulse of curve D
as illustrated by curve E. This negative signal
when applied to tube 18 of the multivibrator 15
10y causes that tube to become nonconductive where
may be conventional and are, per se, well under
stood by those skilled in the art.
There is coupled to the output circuit of sig
nal-shaping network 14 a pulse generator 15
of the well-known multivibrator type. The puise
generator 15 thus comprises vacuum tubes 16
and 11, each having its anode circuit coupled to
the grid circuit of the other through the con
by tube 11 becomes conductive, due to the cross- '
densers 18, 18, the arrangement being such that
its cycle is initiated by the sharp pulse output
from signal-shaping network 14 which is applied
to the input circuit of tube 16. synchronizing
coupling described above, and the following syn
chronizing signal, as represented by pulse 64’
of curve C, which is applied to the grid circuit
signals from signal separator 61 are applied to 15 of the second tube 11 from signal separator 81
causes tube 11 to become nonconductive. 1n
the input circuit of the second tube 11 of the
this manner a relatively broad pulse, as repre
multivibrator in order to fire tube 11 with the
sented by curve 1i',A is developed by pulse gen
ñrst synchronizing pulse following the time when
erator 15 which is initiated by the pulse of curve
tube 16 is fired. A differentiating circuit 19 is
coupled to the output circuit of pulse generator 20 E and which is terminated bythe synchronizing
pulse 64’ of curve C'.
15 in order to derive from the trailing edge of the
output pulse of generator 15 a sharp negative
pulse for initiating the operation of the circuit
of a pulse generator or pedestal generator 80
which may be of the same type as pulse generator
The broad pulse of curve F is thereafter
diiîerentiated in circuit 19 to provide a signal
output of the form of curve G which is applied
to the pedestal generator 80. -Pedestal gener
ator 80, operating in a manner similar to that
described for pulse generator 15, is effective to
15, but which is shown in schematic form. Syn
chronizing signals from signal separator 61 are
derive a rather broad pulse, as shown by curve
also applied to the second tube of the pedestal or
H, which is initiated vby the negative component
pulse generator 80. A limiter stage 8| is coupled
to the output circuit of pedestal generator 80 to 30 of the signal illustrated in curve G and which is
terminated by the synchronizing pulse 84" ap
derive a rather broad pulse which exists during
plied to the second tube of signal generator 80
the interval when the reference and indication
from signal separator 61. Limiter 8| is eiîec
signal corresponding to meter l2 is translated by
tive to derive from this broad pulse a substan
the system. The signal output of limiter 8| is
tially flat-top pulse, as illustrated by curve I,
applied to a mixer unit 82 together with the
which pulse is applied to the mixer unit 82. In
signal output from signal separator 13 in order
asmuch as the indication and reference signals
to cause the pedestal and the signals correspond
and the meter-reference signal, as illustrated by
ing to meter I2 to be superimposed, the control
curve B, are also applied to the mixer unit 82,
electrode 83 of cathode-ray tube 65 being con
40 there is derived in the output circuit thereof a
nected to the output circuit of mixer unit 82.
In order effectively to separate the reference
signal of the wave form of curve J and which
and indication signals corresponding to meter
includes a relatively broad pulse having super
I2’ from all other translated signals, a differ
imposed thereon the indication signal 6| and
entiating circuit 84 is provided having an in
the reference signal 80” which were` derived
put circuit coupled to pedestal generator 80 for 45 during the scanning of meter I 2. Inasmuch as
deriving from the trailing edge of the pulse
the pulses 8| and 60” of curve J have a greater
generated by pedestal generator 80 a sharp
amplitude than any other components of the
pulse. There are connected to the out
signal applied to cathode-ray tube 65, which is
put circuit of the differentiating circuit 84, in
normally biased to be nonconductive and to re
the following order, a pedestal generator 80',
spond only to these signals of increased ampli
a limiter 8|', and a mixer unit 82’ which corre
tude, the cathode-ray tube 65 is eii‘ective to pro
spond, respectively, to pedestal generator 80,
limiter 8|, and mixer unit 82 and, therefore,
duce two spots-upon its fluorescent screen 12
which are spaced by a distance which is pro
portional to the spacing of pulses 6| and 60".
There is thus produced upon the face of the
cathode-ray tube an indication of the general
form of that shown in Fig. 2a and a suitable
the synchronizing signals of the composite sig
scale may be associated with the fluorescent
nal of curve A are derived at the output circuit
screen to indicate the exact reading of meter
of signal separator 81 and are applied to the 60 I2'. The indication produced on screen 12 gen
scanning oscillator 68. These synchronizing
erally corresponds to the indication of meter l2,
signals are represented by curve C of Fig.' 3 and
which indication is illustrated in Fig. 1a. Thus,
are utilized to cause the cathode-ray beams of
the indication produced on screen 12 com-prises
the signal-reproducing devices 85 and 56 nor
a luminous area at the zero scale point and also
mally to trace a circle in synchronism with the
comprises another luminous area corresponding
scanning at the transmitter in a manner which
to the actual meter reading. It will b_e under
is, per se, well understood by those skilled in
stood that the scale for screen 12 can be omitted
the art.
, and that the distance between the reproduced
The signal separator 13 is effective to provide
luminous areas alone can be used to provide an
at its output circuit positive signal components,
indication of the meter reading.
numbered 30, 34, 30, 3|, 30, 32, 30, as repre
In deriving the signal components related to
sented by curve B, and corresponding to the
meter I2' and which are to be reproduced in tube
negative components of the composite signal
8B, the differentiating circuit 84 is effective to
illustrated in curve A. The integrating arrange
derive a double pulse output signal of the form
ment in signal-shaping network 14 is adapted 75 of curve K from the broad-pulse output signal
bear similar reference numerals primed.
'
„
Reference is made to the curves of Fig. 3 fora description of the operation of the reproduc
ing arrangement of Fig. 2. It will be seen that
2,403,890
9
mined interval.
.in curve H. The negative component of the
signal represented by curve K, together with the
synchronizing signal B4, are utilized to derive,
in pedestal generator 8U', a pulse output of the
veloped pedestal pulse for effectively separat
wave form of curve L in a manner similar to that
described for pedestal generator 80 in deriving
the signal output of the wave form H.
The pulse output of pedestal generator 8D’ is
limited in limiter 8|’ to provide a flat-top pulse
of the wave form illustrated in curve M which is
thereafter applied to the mixer unit 82’. Since
this last-named broad pulse occurs only during
the interval when reference and indication sig
nals corresponding to meter I2' are present in
the signal, there is developed at the output cir
cuit of mixer 82" a signal of the Wave form of
curve N which is reproduced in tube 66 in the
same manner as described above in connection
with the description of the operation relating to
curve J and tube 65. The scale corresponding t0
meter I2’ is represented in Fig. 1b and the cor
responding representation reproduced on screen
12’ is illustrated inA Fig. 2b.
In some cases it may be found that the indi
eating signals 6l and 62 correspond very closely
in time with one of the synchronizing pulses,
as represented by pulses 64, 64’ and B4" in
which case the indicating signals may be eiïec
tive substantially to obscure the synchronizing
signals in the composite signal. For this reason
it is preferable that the synchronizing signals
have an amplitude substantially greater than
that of the indicating signals. It is for this
reason that mixer 43 is preferably so designed
as‘to limit the components of the composite sig
nal corresponding to indication signals 6| and
62 to a predeterminedr value.
While applicant does not Wish to be limited
to any specific operating conditions, it has been
found that the following operating parameters
result in a particularly satisfactory system:
Cycles per second
Frequency of meter-reference signals de
rived from oscillator 27 ______________ __ 1,090
Frequency of synchronizing pulses ______ __
50
Frequency of reference pulses __________ _50
'n
10
of pedestal generator 80 and which is represented
Also, each of mixer units 82
and 82' comprises a means for utilizing a de
ing the reference and indication signals corre
sponding to a particular one 0f the meters I2 and
I2’.
While, in the arrangement shown, two meters
only are included in the system, it will be appar
ent that the system can be extended to provide
a telemetering system for any desired number of
meters. Furthermore, it will be understood that
many other forms of signal-reproducing appa
ratus are suitable for providing an indication of
the meter readings once the signals correspond
ing to each particular meter have been eiîective
1y separated as taught by the invention.
While there has been described what is at
present considered to be the preferred embodi
ment of this invention, it will be obvious to those
skilled in the art that various changes and modi
fications may be made therein Without departing
from the invention, and it is, therefore, aimed
in the appended claims to cover all such changes
and modifications as fall within the true spirit
and scope 0f the invention.
W’hat is claimed is:
v
l. A telemetering system for developing a com
posite signal representative of the indications of
a, plurality of meters comprising, scanning means
for developingsuccessive electrical signals of one
type representative of reference and indication
points for each of said meters, means operating
synchronously with said scanning means for de
veloping electrical synchronizing signals of a
different type, means operating synchronously
with said scanning means for developing meter
reference signals having an electrical character
istic rendering them separable from said above
mentioned signals, and means for combining said
signals into a composite signal for transmission.
2. A telemetering system for developing a com
posite signal representative of the indications of
a plurality of meters comprising, scanning means
for developing successive electrical signals of a
given polarity representative of reference and
indication points for each of said meters, means
operating synchronously with said scanning
means for developing electrical synchronizing sig..
In utilizing the preferred parameters given
nals of a polarity opposite said given polarity,
above, it will be found that all major signal com 50 means operating synchronously with said scan
ponents of the composite signal represented by
ning means for developing meter-reference sig
curve A fall within the audio-frequency range
nals having an electrical characteristic render
and, therefore, may be translated in conven
ing them separable from the above-mentioned
tional voice-frequency communication apparatus.
signals, and means for combining said signals
Therefore, when the signal generator of Fig. 1 55 into a composite signal for transmission.
is used in an airplane, for example, the conven
tional radio-communication apparatus can be
utilized to translate the composite signal rep
3. A telemetering system for developing a com
posite signal representative of the indications of a
plurality of meters comprising, scanning means
for developing successive electrical signals of a
resented by curve A to a ground station where
the signal can be received by and reproduced 60 given polarity representative of reference and
from a conventional radio receiver.
indication points for each of said meters, means
rFrom the foregoing explanation of the opera
operating synchronously with said scanning
tion of the above-described telemetering system,
means for developing electrical synchronizing
it will be apparent that the receiver units 14, 15,
signals of a polarity opposite said given polarity,
and 19-8I, inclusive, in conjunction with units 65 means operating synchronously with said scan
84, 80', and` 8|’ comprise the means responsive
ning means for developing meter-reference sig
to the meter reference signals developed by oscil
nals of said given polarity and having an electrical
lator 21 of the transmitter for effectively sep
characteristic rendering them separable from
arating from the composite signal the reference
said above-mentioned signals of said given
and indication signals corresponding to each of 70 polarity, and means for combining said signals
the meters I2 and l2’. It Will also be manifest
into a composite signal for transmission.
that each of the pedestal generators 80 and 80'
4. A telemetering system for developing a com
comprises a means responsive to the meter ref
posite signal representative of the indications of
erence signals andthe synchronizing signals for
a plurality of meters comprising, scanning means
developing a pedestal pulse during a predeter- .'15 for developing successive electrical signals com
2,403,890
12
prising a series _of time-spaced pulses and repre
sentative of reference and indicating vpoints for
each of said meters, means operating synchro
nously With said scanning means for developing
electrical synchronizing signals comprising a
series of time-spaced pulses of a polarity opposite
that of said given polarity, means operating syn
chronously with said scanning means for develop
ing meter-reference signals comprising a succes
posite signal representative of the indications of
a plurality of meters comprising, scanning means
for developing successive electrical signals of one
type representative of reference and indication
points for each of said meters and having all pri
mary components within the audio-frequency
range, means operating synchronously with said
scanning means for developing electrical syn
chronizing signals of a different type and having
sion of closely-spaced pulses during each scansion 10 all primary components Within the audio-fre
whereby the meter-reference signals have an elec
trical characteristic rendering them separable
from said above-mentioned signals, and means
for combining said signals into a composite sig
nal for transmission.
5. A telemetering system for developing a com
posite signal representative of the indications of
a plurality of meters comprising, mechanical
scanning means, distributor means, means in
cluding said scanning means and said distributor
means for developing successive electrical signals
of one type representative of reference and indi
cation points for each of said meters, means in
cluding said scanning means and said distributor
means for developing electrical synchronizing
signals of a diiïerent type, means including said
quency range, means operating synchronously
with said scanning means for developing meter
reference signals having al1 primary components
within the audio-frequency range and having an
electrical characteristic rendering them separable
from said above-mentioned signals, and means
for combining said signals into a composite sig
nal for transmission.
9. A telemetering system for developing a com
posite signal representative of the indications of
a plurality of meters and transmitting said sig
nal for reproduction at a remote point compris
ing, scanning means for developing successive
electrical signals of one type representative of ref
erence and indication points for each of said
meters, means operating synchronously with said
scanning means and said distributor means for
scanning means for developing electrical syn
developing meter-reference signals having an
chronizing signals of a different type, means op
electrical characteristic rendering them separable
erating synchronously with said scanning means
from said above-mentioned signals, said distribut 30 for developing meter-reference signals having an
ing means being such as to cause each of the
electrical characteristic rendering them separable
above-mentioned signals to be developed during a
from said above-mentioned signals, means for
separate predetermined interval during the scan
combining said signals into a composite signal
ning cycle, and means for combining said signals
and transmitting said composite signal to said
into a composite signal for transmission.
remote point for reproduction, signal-reproduc
‘ 6. A telemetering system for developing a com
ing means, means for utilizing said synchronizing
posite signal representative of the indications of
signals to synchronize said reproducing means,
a plurality of meters comprising, mechanical
means responsive to said meter-reference signals
scanning means, distributor means, a common
for effectively separating said reference and in
driving means for said scanning means and said 40 dication signals corresponding to each of said
distributor means, means including said scanning
meters from said composite signal, and means for
means and said distributor means for developing
applying each of said corresponding separated
successive electrical signals of one type repre
reference and indication signals to said reproduc
sentative of reference and indication points for
ing means for reproduction.
each'of said meters, means including said scan .45
10. A telemetering system for developing a
ning means and said distributor means for devel
composite signal representative of the indications '
oping electrical synchronizing signals of a differ
of a plurality of meters and transmitting said '
ent type, means including said scanning means
signal for reproduction at a remote point com
and said distributor means for developing meter
prising, scanning means for developing succes
reference signals having an electrical character 50 sive electrical signals of one type representative
istic rendering them separable from said above
of reference and indication points for each of
mentioned signals, said distributor means being
said matera-means operating synchronously with
such as to cause each of the above-mentioned
said scanning means for developing electrical
signals to be developed during a separate prede
synchronizing signals of a different type, means
termined interval during the scanning cycle, and 55 operating synchronously with said scanning
means for combining said signals into a composite
means for developing meter-reference signals
signal for transmission.
having an electrical characteristic rendering them
7. A telemetering system for developing a com- I
posite signal representative of the indications of
separable from said above-mentioned signals,
means for combining said signals into a com
a plurality of meters comprising, scanning. means 60 posite signal, means for transmitting and receiv
for developing successive electrical signals of a
ing said composite signal, a line-tracing device
given >polarity representative of reference and
associated with said receiving means, means for
indication points for each of said meters, means
utilizing said synchronizing signals to' synchro
operating synchronously with said scanning
nize the line traced by said device with said scan-Í
means for developing electrical synchronizing 65 ning means, means dependent upon said meter
signals of a polarity opposite to that of said given
reference signals for effectively separating said
polarity and of an amplitude appreciably greater
reference and indication signals corresponding to
than the amplitudes of said first-mentioned elec
a particular meter, and means for applying said
trical signals` means operating synchronously
last-named separated signals >to said reproducing
with said scanning means for developing meter
device to vary the line traced by said device there
reference signals having an electrical character
bylto produce an indication of said separated sig
istic rendering them separable from said above
na s.
v
-mentioned signals, and means for combining said
l1. A telemetering system for i developing a
signals into a composite signal for transmission.
.composite signal representative of the indications
8. A telemetering system for developing a corn
„ of a plurality of meters and transmitting said
2,403,890
13
14
ing said synchronizing signals to synchronize said
signal for reproduction at a remote point com
prising, scanning means for developing successive
electrical signals of one type representative of
reference and indication points for each ol’ said
meters, means operating synchronously with said
scanning means for developing electrical syn
reproducing means, means responsive to said
meter-reference signal and to said synchronizing
signals for developing a pedestal pulse during a
predetermined. interval, means for utilizing said
pedestal pulse for effectively separating said ref
erence and indication signals corresponding to a
particular meter, and means for applying said
erating synchronously with said scanning means
separated reference and indication signals to said
for developing meter«reference signals having an
electrical characteristic rendering them separa 10 reproducing means for reproduction.
14. In a telemetering system for reproducing
ble .from said above-mentioned signals, means
a composite signal representative of the indica
for combining said signals into a composite sig
tions of a plurality of meters and including sig
nal, means for transmitting and receiving said
nals of one type representative of reference and
composite signal, means associated with said re
indication points for each of the meters, electri
- ceiving means for deriving said meter-reference
cal synchronizing signals of a diñ‘erent type and
signal, means for utilizing said derived meter
meter-reference signals having an electrical
reference signal for separating said reference and
characteristic rendering them separable from
indication signals for a particular meter, signal
said above-mentioned signals, a signal-reproduc
reproducing means, means for synchronizingT said
signal-reproducing means with said synchroniz 20 ing means comprising, means for utilizing said
synchronizing signals to synchronize said repro
ing signals, and means for applying said sepa
ducing means, means responsive t0 said meter
rated reference and indication signals correspond
reference signals for effectively separating from
ing to said particular meter to said reproducing
said composite signals said reference and indica
means for reproduction.
12. A tclcmetering system for developing a 25 tion signals corresponding to a particular meter,
and means for applying said separated reference
composito signal representative 0f the indications
and indication signals to said reproducing means
of a plurality of meters and transmitting said
chronizing signals of a diil’erent type, means op
for reproduction.
signal for reproduction at a remote point come
prising, scanning means for developing succes
15. In a telemetering system for reproducing
sive electrical signals of one type representative 30 a composite signal representative of the indica
tions of a plurality of meters and including sig
of reference and indication points for each of
nals of one type representative of reference and
said meters, means operating synchronously with
indication points for each of the meters, elec
said scanning means for developing electrical
trical synchronizing signals of a different type
synchronizing signals of a different type, means
operating synchronously with said scanning 35 and meter-reference signals having an electrical
characteristic rendering them separable from
means `[or developing meter-reference signals!
said above-mentioned signals, a signal-reproduc
having an electrical characteristic rendering
ing means comprising, means for utilizing said
them separable from said above-mentioned sig
synchronizing signals to synchronize said repro
nals, means foi` combining said signals into a
composite signal, means for transmitting and re 40 ducing means, means responsive to said meter
reference signals for developing a pedestal pulse
ceiving said composite signal` a signal~rcproducduring a predetermined interval. means for uti
ing means associated with said receiving means,
lizing said pedestal pulse for eiTectively separat
means for utilizing said synchronizing signals to
ing said reference and indication signals corre
synchronize said reproducing means, means re
sponding to a particular meter, and means for
sponsive to said meter-reference signals for de
applying said separated reference and indication
veloping a pedestal pulse during a predetermined
interval, means for utilizing said pedestal pulse
for effectively separating said reference and indi~
signals to said reproducing means for reproduc~
tion.
16. In a telemetering system for reproducing
cation signals corresponding to d particular me
-4/
a composite signal representative of the indica
tions of a plurality of meters and including sig
nals of one type representative of reference and
indication points for each of the meters, elec
trical synchronizingr signals of a different type
and meter-reference signals having an electrical
ter, and means for applying said separated refer
ence and indicating signals to said reproducing
means for reproduction.
13. A telemetering system for developing a
composite signal representative of the indications
of a plurality of meters and transmitting said
signal for reproduction at a remote point com
prising, scanning means for developing successive
electrical signals of one type representative of
reference and indication points for each of said
meters, means operating synchronously with said 60
scanning means for developing electrical syn
chroniziner signals of a diñerent type, means op
ing means comprising, means for utilizing said
synchronizing signals to synchronize said repro
ducing means, means responsive to said meter
reference signals and to said synchronizing sig
nals for developing a pedestal pulse during a pre-¢
determined interval. means for utilizing said
erating synchronously with said scanning means
for developing meter-reference signals having an
electrical characteristic rendering them separa
ble from said above-mentioned signals, means for
combining said signals into a composite signal,
means for transmitting and receiving said com
posite signal` a signal-reproducing means associ
ated with said receiving means, means for utiliz
characteristic rendering them separable from
said above-mentioned signals, a signal-reproduc
pedestal pulse for effectively separating said ref
erence and indication signals corresponding to a
particular meter. and means for applying said
separated reference and indication signals to said
reproducing means for reproduction.
70
JOHN KELLY JOHNSON.
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