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Nov. 19,‘ 1946.
Filed Sept. 11, 1945
5 sheets-sheet 1
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_ NOV- 19, 1946.
Filed Sept. 11, 1945
3 Sheets-Sheet 2
NOV. 19, 1946-.
Filed Sept. 11, 1943
3 Sheets-Sheet 3
Patented Nov. 19, 1946
Edward S. Peterson, Elmwood Park, 111., assignor
to Automatic Electric Laboratories,‘ Inc., Chi-e
cago, 111., a corporation of Delaware
Application September 11, 1943, Serial No. 501,956
1. Claim. (Cl. 177—337)
This invention relates. to telemetric systems
and, more particularly, to a system of this type
especially adapted for the‘remcte indication of
of a plurality of direction ?nders is provided. with
an azimuth scale for observing the azimuth. of. a.
radio transmitter, the location of which is to be:
azimuth of a direction ?nder.
To locate a radio transmitter, a plurality of
observation points is established, each using a
direction ?nder, and the azimuth observed at
each direction ?nder is transmitted to a central
point where, by triangulation, the radio trans
obtained by triangulation. ‘ Each direction ?nder
is connected by a telemetric; system to the central~
point. This telemetric system includes an im—‘
pulse transmitter at the_direction ?nder‘whijch
transmits over a plurality of channelsa prede
termined number of impulses: corresponding. to.
mitter is located. To facilitate this transmission
of‘ observed; azimuth from a plurality of direction
?nders to a. central point each direction ?nder is
provided with a telemetricsystem. to indicate con
, the; angular displacement of the azimuth scale.
portabledirection- ?nders are used it of course
course, is necessary to correlate the azimuth. scale
of the direction ?nder with the azimuth indicat+
At; the remote azimuth indicating station these
impulses are received and translated into a core
responding angular displacement. of an azimuth
indicating scale. At the. time. when portable di
tinuously at the central point the azimuth ob
tained by. the individual direction ?nder. When 15 rection. ?nders are set up for operation. it, of
is desirable to provide remote azimuth indication
with the simplest type of telemetric system‘v which
will operate with the. desired degree'of accuracy.
It furthermore is desirable to obviate the‘ neces
sity of using a power sourcewhich‘requires care
ful control or regulation ‘of either frequency or
voltage as would be.‘ the case. were alternating
power to be used. In- setting up. portable direc
tion ?nders for the location of: radio transmitters‘
by‘ triangulation, it is necessary'torprovide some
arrangement whereby a. reference point on the
azimuth‘ scale of the direction ?nder may be co
ordinated' with a corresponding reference point
on the scale of‘ the‘ remote.- azimuth indicating
ing scale at. thecentral. point. For this purpose
a control'circuit is. providedwwhereby' the. direc
tion ?nder azimuth scale may'be locked. at: a-prea
determined reference point and theremote azi
muth indicating scale may thenbe moved to: a
corresponding point. This‘ arrangement. for
orienting the remote azimuth indicating scale.
utilizes‘ an improved receiving‘ apparatus. wherein.
the control circuit operates an electromagnet‘to
stop the scale at a predetermined referencepoint.
In response. to‘ the‘ stopping. of the remote azie
muth: indicating scale another electromagnetl is.
arranged to be energized to disconnect. the scale.
apparatus. When the referencepoints have been
from a motor normally arranged to' drive the
coordinated all subsequent indications at" the re
Other and. further‘ objects of ‘the present inven-v “
tion will become more readily‘ apparent by refer
azimuth indications at the direction ?nder.
It- is therefore an object of‘ this invention to 35. ence to the following description taken in con
nection with the accompanying drawings: wherein;
provide an improved telemetric system for re
Fig. I is‘ a‘ circuit‘ diagram‘ of a. tel‘emetric system.
producing‘ at a remoteipoint the angular displace
embodying the‘ present invention; Fig. 2‘ is aper
ment of a member in either'direction.
spective view of a cabinet housing apparatus
Another object of‘ this invention is to provide
an improved telemetric system for reproducing 405 shown in the remaining ?gures‘ wherein Figs. 3,
4 and 5' are rear, side'and topl views of the ap-~
angular displacement. of amember with the‘ con
mote point will correspond accurately with the
trol means for coordinating a predetermined ref
erence point on an angularlyv displaceable mem
ber with a reference point’ on a remote indicat
ing member.
Still another object of‘ this invention is to pro
vide an improved‘ telemetric receiving‘ apparatus
for indicating- the angular displacement of a re-'
Referring to Fig. 1, there is shown‘ a-telemetri‘c'
system interconnecting an: azimuth observation
45 station and a remote azimuth indicating station.
The azimuth ‘observation station includes some
form of’ direction ?nding apparatus, as for exam- -
plc a loop antenna, the ‘position of which maybe‘
changed by rotation of a hand wheel til which
'Still another object of the present invention 50/‘turns a shaft H which may support the loop
is to provide an improved tel'emetric receiving
antenna. The shaft H is‘ connected through a
indicator with means for' coordinating: the indica
friction clutch £2» to a gear l3 and an azimuth
tor'with a reference point on a-‘remotely‘ located
scale M. The azimuth scale- M cooperates with
motely positioned member.
angularly displaceablemember; '
vIn accordance. with the present invention, each
an'indicating- point E5’ to show the azimuth of the ‘
loop“ antenna. The azimuth scale I41 is provided
with a reference point in the form of a notch l6 v
plurality of ?eld coils 49, 5| and 52 arranged to
which is arranged to be engaged by a detent lever‘"
|1 normally biased away from the azimuth dial
l4. The gear l3 drives a gear i6 which is pro
vided with two studs i9 and 2| spaced along a C1
diameter of the gear. These studs I9 and 2|
engage levers 22 and 23 which are freely rotatable
upon a shaft 24. The ends of the levers 22 and
23 engage the ends of levers 25 and 26, which
levers are rigidly secured to the shaft 24. A coil 10
spring 21 interconnects the levers 22 and 25.
be energized from the conductors or transmission
channels 44 to 46, respectively. These ?eld coils
49, 5| and 52 are mounted on magnetic core or
Another spring 28, operating in the opposite di
rection with respect to the spring 21, intercon
pole structures 53, 54 and 55, respectively, for
cooperation with a plurality of armatures 56, 51
and 58. The various armatures 56 to 58 are sup
ported at equal angular displacements on. a shaft
59. The remaining terminals of the ?eld coils 49,
5| and 52 are each connected to the conductor
41 so as to ibe included in the completeelectric
circuit with the impulse transmitting device 35.
The impulse responsive motor 48 has its ?eld
nects the levers 23 and 26. This arrangement of
coils energized in succession in accordance with
levers and springs constitutes an energy storage 15 the completion of circuits by the impulse trans
device so that a gear 29 affixed to the shaft 24
mitting device 35. If, for example, the switch
may be rotated through an angular displacement . 31 were the only switch to be closed the ?eld coil
corresponding to an angular displacement of the
49 would be the only one energized so as to cause
gear l8. If it is assumed that the gear [8 rotates '
its armature 56 to be in alignment with the pole
in a clockwise‘ direction the stud 2| will move the 20 structure 53. When two switches, such as 31
lever 23 away from the lever 26, thereby to ten
and 39, are closed at the same time, ?eld coils
sion the spring 28 so'that it will cause the lever
49 and 52 are both energized and for that period
26 to follow the movement of the lever 23. The
of time the armatures 56 and 58 will each tend
lever 26, however, cannot move in excess of a pre
to move into alignment with the respective pole
determined rate because of the action of the gov 25 structures, but because of the angular displace
ernor 42 which controls the movement of the gear
ment therebetween neither one is in alignment‘
29 through gears 4|, 32 and 38. When the shaft
with its pole structure. If it is assumed that the
24 and the gear 29' have moved through an angu
cam 36 of the impulse transmitter 35 is moving
lar displacement equal to the angular displace
in a clockwise direction, it becomes apparent that
ment of the gear IS the lever 26 will again engage 30 shortly thereafter the switch contacts 31 will be “
the lever 23 whereupon further movement will
opened, whereupon'the ?eld coil 52 1will be the
only one energized so that its armature .58 will
If it is now assumed that the gear l8 moves in
be aligned with its pole structure 55. ‘As the cam a counterclockwise direction the stud l9 will move
36 continues to rotate the switch 38v will be‘ closed
the lever 22 so as to tension the spring 21.
The 35 to energize the ?eld coil 5| and thereby tend to
tension of the spring 21 will cause the lever 25
to follow the movement of the lever 22. If the
bring into alignment with its pole structure 54
movement of the lever 22 is at a rate greater than
armatures produces a movement of" the shaft59=
its armature 51. The movement of the various
the .r‘ate'at which the shaft 24 may rotate there
in a direction corresponding to the direction of"
will be a time delay, but eventually the lever 25 40 movement of the cam structure 36. The shaft
will again ‘reach the lever 22 whereupon rotation
59 is connected to a gear 6| which meshes with
of; the shaft 24 ceases. Thus it is apparent that
a gear 62 mounted upon a sleeve 63.
there has been provided a follow-up mechanism
‘ The sleeve 63 has secured thereto a clutch plate
whereby the gear 29 will be moved through an
64 which is arranged to cooperate with a clutch
angular. displacement equal to the angular dis 45 plate 65 mounted upon‘a shaft 66. The clutch
placement of the gear l8 but this movement will
plate 64 is spring biased by a'spring 61 toward§
not ‘exceed a predetermined rate of speed. The '
the clutch plate 65 so as normally to provide a
gear 29 drives another gear 36 mounted on a shaft
solid driving connection between the sleeve 63
3| which supports a gear 32. The gear 32 engages
and the shaft 66. The shaft 66 through a ‘gear
a gear 33 mounted on ashaft 34, which at one
68 drives a gear 69 which is secured to the remote
end is provided with an impulse transmitting
azimuth indicating scale 1|. The gear 69 and
device 35. The impulse transmitting device com
the indicating scale 1| are a?ixed to a circular
prises a cam member 36 arranged to actuate a
member 12 having at a predetermined point on '
plurality of switches 31, 38 and 39 arranged at
its periphery a notch 13. The notch 13 consti
equal angular distances about the shaft‘ 34. In 551: tutes a referencepoint arranged to cause certain
order to control or limit the maximum speed at
indicia on the scale 1| to be aligned with an in
which the shaft 34 ‘may be rotated the gear 32
dicating pointer 14. The notch 13 is arranged
is arranged to engage a gear 4| which drives a
governor 42.
for selective engagement with a detent 15 mount
ed adjacent the free end of a lever 16 which is
The follow-up mechanism per se, schematically 60; arranged to be actuated by a relay 11. When
shown in Fig. 1, may be of the type shown, de
the lever 16 is actuated so that the detent 15 en
scribed and claimed in my copending application
for Remote control systems, Serial No. 501,957,
?led September 11, 1943.
The transmitting device 35 is connected in a
multi-channel circuit which extends to the remote
azimuth indicating station. This circuit includes
a source of potential, such as a battery 43. The
gages the notch 13 of the circular member 12; '
a spacing link I01 is arranged to move ‘a switch
plate to close a pair of switch contacts 19. These
switch contacts 19 control the energization of a
relay 8| which is arranged to attract its’ arma
ture 82 to move the lever 98 which engages the
spring 61' so as to free the clutch plate 64 from
switches 31, 38 and 39 are each connected by suit
engagement with its cooperating clutch plate 65,
able transmission channels, such as conductors 70,"thereby to render ineffective the motor 48. The
44,v 45 and 46 to the remote azimuth indicating
relays 11 and 8| are connected in a control cir- ‘
station. The return circuit to the source of poten
tial' 43 includes a conductor 41. At the remote
azimuth indicating station there is provided an
cuit which includes the conductor 41, the battery I
43, a switch 83 located at the azimuth observa
impulse-controlled motor 48 which comprises a 75;
tion station, and a return conductor 84.
' '
" '
When the direction ?nder apparatus is set up
for use the ?rst steps taken are those to provide
a coordination between the azimuth observation
scale l4 ‘and the azimuth ‘indicating scale 1|.
The operator pushes against the detent H and
turns the hand ‘wheel {-0 until the detent ll drops
into the notch it of theazimuth observation
scale 14, whereupon “0” or 360° will register with
motor 43 :is provided with ‘a. pair of end plates 9.0
and :96 which, together with mounting stud
members :91 secured to the ‘mounting panel 92
retain in proper alignment position the motor
pole structures .53, 54 and 55 and the motor shaft
59 which supports the ,armatures 56 to Fill. The
the indicating pointer I5. While retaining the
azimuth scale [4 in this position the wheel i0
motor shaft 5.9 has a gear 6! shown in Fig. 5
which meshes with an anti~backlash .or split
gear ‘62 arranged to drive the clutch plate 64
is rotated, since the friction of the clutch I2 is in which ‘is arranged for cooperative relation with
such that this is permissible, until a. compass 2%
the clutch plate 65. If desired a clutch disk 60
indicates that the loop antenna or direction find
may be interposed between the two clutch. plates
ing apparatus is aligned with magnetic north.
.and‘BT: to- vprovide the required degree of fric
'I'hereupon the detent l'llis released and the
tion. The clutch plate 64 is biased toward the
switch 83 is closed so as to energize at the remote .
clutch plate .65 and the clutch disk 66 by a spring
azimuth indicating station the magnet ‘ii. The
iii which bears against a lever 98 pivotally sup.
whee1 I8 is then rotated so as to bring about one
ported at at from a supporting bracket vllll suit
complete revolution of the azimuth observation
ably secured to the mounting panel 92.‘. The
scale l4. Rotation of the wheel it produces ro
spring E'i is supported by a bracket I02 suitably
tation of the gears 13 and I8. Dependent upon 20 secured ‘to the mounting panel 92. At an. inter
the direction of rotation of the gear l8 one of
mediate point ‘thereon the lever '98 is provided
the two lever-s 22 or 23 will be actuated so as to
with the armature 8.2 which cooperates with the
bring up or tension its associated spring 21 or
relay ‘3!. ‘The ‘relay 8! is attached to a bracket
2B. The tension on the spring thus produces
194 also suitably secured to the mounting panel
rotation of the shaft 24 at a rate of speed deter
82. The gear 38 which is attached to the shaft
mined by the governor 42 which, by a gear 4!,
tr engages another split anti-backlash gear 69
is connected to the gear 32. The levers 22 and
which is mounted for rotation with the circular
23 together with other associated parts including
member ‘i2 and the dial indicating member ‘H.
the spring members 21 and 28 constitute a follow
The circular member ‘F2 is provided with a notch
up mechanism in which mechanical energy is
i3 arranged for cooperation with a detent 15
stored so that the shaft 24 is moved through an
mounted on the outer extremity of an .arm "l6
angular displacement corresponding to that of
pivotally mounted upon a pin I85 suitably se
the gear 18. Due to the step-up gear arrange
cured to the mounting panel 92. The lever arm
ment between the shaft 1 I and the shaft 34 which
‘H5 is arranged to be actuated by a linkage which
is connected to the impulse’ transmitter 35, a 35 includes a member I65 securely fastened to the
small angular displacement of the shaft H pro
arm 16, a pivoted spacing link‘! 01 which inter
duces a number of revolutions of the shaft 34,
connects the member !96 with a member I08
whereby a plurality of impulses are transmitted
which is secured to the armature I09 of the relay
over each of the channels 44, 45 and 45, the im
‘H. The armature I99 of the relay 1‘! is pivoted
pulses of each series of impulses being displaced
at Hi and is provided with a rearwardly ex
in time relative to the impulses in the other series
tending arm H2 positioned between two posi
due to the angular displacement of the switch
tioning springs H3 and [M which serve to hold
contacts 31, 38 and 39 about the shaft 34. The
the armature H89 in a position so that the detent
impulse device 35 therefore transmits sufficient
T5 at the end of the arm 16 normally does not
impulses to cause the impulse receiving motor 48
engage the outer periphery of the circular mem
to produce rotation of the member ‘12, so that the
ber ‘E2. The outer extremity of the army H2
detent 75 will engage the notch 13. When this
is also arranged to engage an insulating member
occurs the magnet 8! is energized so as to release
H5 so as to close a pair of contacts 19.
the clutch mechanism interconnecting the sleeve
relay l‘! is supported from the front panel 81
by a suitable bracket H6. The front panel 81
also supports a bracket H8 in which there is
63 and the shaft 6%, thereby to render ineifective
further action of the motor 48. The operator
then continues to turn the wheel H] until the
“0” or 360° point is again in alignment with the
indicating pointer l5, whereupon the switch 83 is
released. Thus the coordination of the reference
points on the observation station and the remote
indicating station is complete.
In Fig. 2 there is shown a perspective view of
a cabinet 85 which houses the remote azimuth
indicating apparatus. This cabinet 85 comprises
mounted a plug connector H9 which, as may be
seen from Fig. 2, is arranged to extend to the
exterior of the cabinet 85.
The plug connector
receives the terminal at the end of a cable which
includes the conductors 44 to 41 and 84.
From a description of the mode of operation
of the telemetrio circuit it will be remembered
that when the control circuit was energized by
the closure of the switch 83 the relay 1‘! was
a boxlike structure {36 having a front cover 81
energized, thereby tending to pull down its ar
which is provided with an opening 88 through
which is visible the dial scale 68. Figs. 3, 4 and
5 show that all of the apparatus contained in
the cabinet 85 is supported from the front panel
81. The front panel 81 is provided with a plu
rality of mounting posts 89 which are secured
in position by suitable screws 9! visible from
the front of the panel 81. A mounting panel
92 is mounted parallel to the front panel 8'! and
some distance therefrom by a plurality of studs
93. The studs 93 are supported from the front
panel by a plurality of screws 94 and at their
opposite extremities a plurality of screws 95
mature I09 and its associated lever 16 so that
the detent 15 is in engagement with the periphery
of the circular member 12, so that when the notch
13 comes into engagement with the detent 15
the member 12 will be locked in this position.
When the arm 16 thus moves an additional dis->
tance from that shown in Fig. 3 the armature
Hi9 will be moved so its rearwardly extending
arm H2 will operate to close the switch contacts
19, thereby to close the energizing circuit for the
relay 8!. The relay 8!, as is apparent from
Fig. 5, attracts its armature 82 thereby to pivot
the lever 98 rearwardly against the action of the
hold in position the mounting panel 92. The 75 spring 61. Therefore the spring 61 no longer
urges the clutch plate 64 into engagement with
the clutchvplate 65 and the clutch disk 60, so
ing station, a. transmission'channel intercon
necting said stations, an angular displaceable in
that subsequent rotation of the motor 48 may
dicator at each of said stations, an indexing point
occur without any strain upon any of the gears.
on said indicators, means at said transmitting
station controllable responsive to angular dis
placement of said indicator thereat for transmit
ting a series of impulses over said transmission
channel to said receiving station, means at said
This clutch arrangement also provides for an
accurate stopping of the indicating dial ‘H with
out subsequently introducing an error which
might occur in other arrangements due to a
strain being placed upon the split. gears 69 and
receiving station operable responsive to said series
62. 'When the operator at the azimuth observa 10 of impulses for angularly displacing the said in
tion station has returned the azimuth indicator
dicator thereat an amount corresponding to the
to “0” the switch 83 will be released so that both
angular displacement of said transmitting sta
magnets 11 and BI are deenergized. Thereafter
tion indicator, a control channel interconnecting
any subsequent movement of the azimuth dial at
said stations for placing said indicators in align
the observation station will produce rotation of 15 ment, means at said transmitting station for at
the impulse transmitter 35 to bring about a
times energizing said control channel while said
corresponding movement of angular displacement
transmitting station indicator is, angularly dis
of the azimuth indicating dial ‘H at the remote
placed a predetermined amount to control said
azimuth indicating station.
While for the purpose of disclosing the present 20 angular displacement of said receiving station
indicator over said transmission channel, and
invention a particular circuit arrangement and
means at said receiving station controlled over
a particular receiving apparatus has been shown
said energized control channel for terminating
and described, it of course is to be understood
angular displacement of said receiving station
that modi?cations may be made in the circuit
arrangements and in the instrumentalities em 25 indicator at said indexing point thereby to align
ployed without departing from the spirit and '
scope of the invention as set forth in'the ap
pended claim.
the said, indexing points of said transmitting and
receiving station indicators when the said pre
determined angular displacement of said trans
mitting station indicator has been terminated
What is claimed is:
A telemetric system for reproducing angular 30 and said control channel‘has been v,deenergized.
displacement of a member in either direction
comprising a transmitting station and a receiv
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