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31, i935.
l
B. |_. DOLBEAR
2,026,123
IMFRQVED DIRECTION FINDER BALANCER
Filed Jan. 18, 1952
£52519
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H754“ ,5] /0/2/17/20 75
ATTORNEY
2,026,12á
Patented Dec. 31, 1935
UNITED STATES
PATENT oI-‘Flcia¥
2,026,123
IMPROVED vrnlnno'rl'o'iii FINDER.
BALANCER'
Benjamin L. Dolbear, Belmont, Mass., assignor to
Radio Corporation of America, a corporation
of Delaware
Application January 18, 1932,V Serial No. 587,325
6 Claims.
(Cl. 250;-11)
This invention relates to improved radio direc
tion finder balancers, and more particularly those
used in the higher frequency circuits.
An object of this invention is to simplify and
5 improve direction finder balancers.
A further object of this invention is to simplify
and so arrange the devices which are associated
With a capacity balancer that the maximum effl
The invention consists of various other features
and methods of construction as describedV and
illustrated in the accompanying drawing. In the -
drawing like references refer to like parts, of
which-
l
5
Figure 1 is a plan view of the assembled devices;
Fig. 2 is a vertical section of Fig'. 1,V the section'
being taken at line 2_2;
`
’
Fig. 3 is an elevation ofFig. l;
ciency may be obtained when using such an ar
10' rangement of parts in the higher frequency direc
Fig. 4 is a partial direction finder circuit show- 10k
ing that portion which relates to' this invention.
The simplified and improved direction finder
balancer is shown >in Figs. 1, 2 and 3, wherein
tion finder circuit. Likewise, such an arrange
ment also results in a minimum'number of essen
tial parts and thereby reduces the cost of manu
A feature of this invention is the combining of
a sense resistance and a capacity balancer and
by an arrangement of a pair of contacts in such
a manner that the rotaryY plate, which is an im
the base I is of “bakelite dilector” or other good
insulating material of low dielectric loss. Mount- 15
ed upon this base is a central bearing' or bushing 2
which is held in position by the bearing `-nut 3.
An operating shaft 4 is provided with an insu
portant‘element to this invention, may actuate
20 the contacts mentioned above and thereby place
latedknob, 5, and a pointer 6, and locked to the
shaft by means of members 'I6 an-d 'I'I.V 0n the 20
_ ß facture of such devices.
15
Y
the sense resistance in series with one side of a
loop when desired to determine the sense of direc
tion from which a signal is coming.
'
It is well known in the ‘art of direction ñnding
25 that voltages induced in the loop from sources
other than theA distant radio transmitter, such as
the transmitter energy picked up and reradiated
from nearby wires or any other conducting objects
produce the same effect as unbalanced symmetry
opposite end of the shaft 4 is mounted a single
rotary condenser plate 'I which is held securely
in position by means of a nut 8, a collar 9, and
rivets I0, Il, I2 and I3. A springl‘IZ provides
proper friction for the shaft. Directly below the 25
rotary plate l, but spaced about one thirty-sec
ond of an inch, there are located two fixed plates
@Li and I5 respectively, each of . whichare of
_ the minimum a capacity balancer is connected to
equal area and spaced an equal distance from
the center of the rotor shaft 4'so that the ca- 30
pacity >of each plate will be approximately the
same Vwith respect to the center ofthe rotary
plate 'I when it is in a horizontal position. TheseV
fixed plates I4 and I5 are securedtothe base I
35 each side of the loop to' balance out any dissym
metry occurring when the loop is rotated. I have
by means of metallic supports I6, Il, I8 andIB, 35
and fastened by means' of screws _20, 2|, 22, 23,
‘ 30 of the loop receiving circuit. Such unbalance or
distortion prevents the operator of a direction
finder from obtaining a well defined and sharp
minimum or null point. Therefore, to improve
found that in a radio direction finder employing
the higher frequencies in the order of 1500 to
30,000 kilocycles or short wave lengths, that it is
40' desirable and often necessary to shorten and pre
vent sharp bends in the leads or wires connecting
the plates of a capacity balancer with those of
the sense resistance and its associated sense
. switch. I therefore reduce in number and shorten
45 the wires connecting the loop and the balancer,
and also those of the sense resistance, by assem
bling the sense resistance and the sense switch on
a single insulating member. I further arrange the
contacts of the senseswitch in such a manner
50‘ that the operating knob of the capacity balancer
also serves to operate the sense switch. I am so
able to arrange these latter parts for the reason
that the capacity balancer is not used when Van
A ,_ indication o_f the sense _of direction of the received
5‘5- signal is to be obtained.
'
'
£4, 25, 26 and 2l.
A fie'xiblelead 28> is Vsecuredto ~
the rotar-y plate shaft which in turn connects by
means of >a backstop spring member V‘I5 tothe
`sense switch contact 29. -A'relativêly short con- 40
necting strip 30 connects the contact29 with the .
terminal screw 3|, Vwasher~aridnut 32> and 33.
The other contact 34 of the sense switch is con“
nccted by means of a strip 35 to a clip 36, pro-'
viding the mounting of the sense resistance 341. 45 K
The other sense resistance clip 378 isY connected
to the ñxed condenser >plate I5 by a lead 40
and thence byV another lead VIII to the terminal
screws 42,k washers 43, and nuts 44. lThe other 1
fixed plate I4 is connected from the screw 422 50
by meanrsof'a lead 45. to the terminal screw 4_6.,
washer 4l, and nutI 48. The base I is' further
provided with’rsuitable apertures 49, 50, '5I
52, for mounting thejdevice on the panel ofthe
direction finder receiving apparatus.l
55
2
2,026,123
,
trically connect said sense antenna in series with
said resistance which is electrically connected on
Referring now to Fig. 4, a wiring diagram of
this device is enclosed within the dot and dash
line, also the external parts of the circuit are
included, which have not been previously men
tioned. There is shown a loop 53, grounding
condenser 54, ground 55, sense antenna 5B, tun
ing condenser 51, vacuum tubes 58 and 59, with
one end to said fixed contact and on the other
end to one side of the loop to indicate the sense
of direction of an incoming wave.
2. In a radio direction'finder capacity balancer
for an open and closed antenna system compris
ing a loop antenna, a sense antenna, said ca
input grids 60 and 6l, filaments G2 and 63,'with
ñlament rheostat 64, and battery 65 which in
10 dicate the filament supply for the vacuum tubes
pacity balancer having a fixed plate electrode
connected to each side of said loop antenna, said 10
58 and 59, plates 66 and 61 which form the input ” capacity balancer having mounted on a common
of a `superheterodyne receiver 13 comprising a base a rotary plate having a central shaft, said
ñxed plate electrodes oppositely disposed in re
local oscillator 14, ñrst and second detectors 68
and 69 respectively, and a sufficient audio stage ' spect to the shaft of said rotary plate, a pair of
spring members having relatively nxed and mov
19 to Igive the desired signal strength for the
phones
1l.
“t”
.
.
. able contacts, the movable contact being elec
.
trically connected to the rotary plate and posi
In the operation of this improved balancer the
operator first sets the pointerß on zero, which is
a position wherein each of the ñxed plates I4
and l5 are covered by the rotary-'plate 1 by sub
Ytioned adjacent said shaft to make an electrical
connection with the relatively ñxed contact by
means of the edge of Vsaid rotary plate moving
the movablecontact toward said relativelyfixed
contact when saidY rotary plate is rotated in a
_stantiallycan equal area. Then assuming a bea
con station is being received, by listening in the
phones 1I he carefully sets the loop 53 at a po
sition of minimum signal response. VThe knob 5
l0 Cil
30
position'beyondthe area of at least one of the
fixed plates> soV as to ‘electrically connect said
is then rotated slowly in each direction until a
position .is found that will Yfurther reduce the
strength of the signal. It then may be neces
sary for him to obtain a more accurate setting by
sense antenna Vin series with a resistance which 25
is electrically connected on one end to said ñxed
contact and to one of said fixedplates on the
other end so as to be connected in series with
slight readjustment vof the loop and then again
one side of said loop to indicate the sense of di
rection of an incoming wave when said contacts 30
the balancer.
This position will be the line po
sition of the received signal, >and unless the op
are
35.
.
'
an open antenna, a closed antenna, said closed
ahead yofor behind him. Therefore,Y with the
loop remaining in the position of minimum signal
response mentioned above, the operating knob
relatively fixed andmovable contacts `and a re
5 is rotated as far as possible, toward the con
sistance mounted on a base, one side of said re
sistance being electrically connected to at least
one of said fixed plates and said closed antenna,
each side of said closed antenna electrically con
nected to one of »the oppositely disposed fixed
Vsition the sense resistance 31 is then placed in
series with the sense antenna and .one side of
the loop 53. The loop is then rotated through
90 degrees from the null point and rthe _operator
thennotes whether the signal increases or de
plates, said rotary plate being electrically con
nected to said relatively fixed contactand said
response will indicate the direction from which
said lmovable contact by means Vof the edge of
said rotary plate moving said movable contact
toward said relatively fixed contact so that the
open antenna, means for electrically connecting 45
creases in strength. The position of increased. the otherside of «said resistance to one side of
the signal is coming.
50.,
,
antenna having in'combination a capacity bal
ancercornprising a'rotary plate and a pair of 35
oppositely disposed ñxed plates, a switch having
tact 29. In this position the rotary plate 1Y will
close the contacts 29 and 34 and in such a po
4,5
closed.
3. In anni-lateral receiving circuit comprising
_erator knows the approximate source of the sig
nal in respect Vto his position, he Will next ñnd
it necessary to determine whether the signal is
Y
Y
Although this invention has been described as
embodied in a particular form and arrangement
of parts, it Vshould be understood that it is ca
pable of embodiment in other and diíîerent
forms within the spirit and scope of the append
ed claims.
'
.
What I claim is:
1. In a _radio direction finder comprising a
sense antenna, a IOQD, a capacity balancer having
mounted upon a common insulatingbase a cen
tral bearing for a rotary plate, a resistance, a
60 pair of oppositely disposedïñxed plates, a plu-`<
rality of Yupwardly extended support posts for
supporting said pair of fixed plates'which are con
nected to one side _of said loop and are oppositely
disposed in respect to the shaft of said rotary
plate, a pair of upward extending-spring contact
members having relatively fixed and movable
contacts, the movable contact electrically con
resistance and said open antenna are connected
in series with one-side of said closed antenna to
indicate the sense‘of vdirection of the ‘received
-
energy.
'
4. A radio direction finder capacity balancer
for an open and 'closed antenna system including 55
a loop and an open antenna, comprising an Vin
sulated member for-mounting a rotary plate, a
shaft for rotating said rotary plate, a pair of
fixed plates each` of which are connected to said
loop and oppositely disposed in respect-to the
shaftof said rotary plate, a resistance located
onrsaid> insulated member, relatively ñxed and
movable springï contact members arranged on
said insulatedV member to make and break elec
trical contacts, atleast one of said contacts being ,
connectedto one side of said resistance, the other
side of said resistance being connected to one
of said fixed plates Vand said iixed contact mem
nected to said sense antenna and the rotary plate
and being arranged on the base at right angles to ber, said other contact’ being positively connected
70 each >of said ñxed plates and positioned in the .toY said rotary plate and intermittently to said
path of said rotary plateso as to make electrical openantenna by means of said rotary plate mov
connection to the relatively fixed contact when ing in a path so as to close said contacts for
the rotary plate is rotated past the `position be- - electrically connecting in series said open an
yond the active capacity area ofat least one of tenna with one side of s'aid loop, for indicating
e theñxed plates to close the contacts and to elec
the sense of direction of an incoming wave.
w
c
3
2,026,123
5. A uni-lateral receiving energy responsive
sense antenna, a loop, a capacity balancer having
circuit comprising a closed antenna and an open
a base` on which is mounted a rotary plate, a re~
antenna, said closed antenna forming a circuit, a
sistance, apair of oppositely disposed ñxed plates,
resistance and a switch, said switch having ñxed l said ñxed plates being connected to each side
and movable contacts, a pair of ñxed condenser
plates substantially of the same area, each of said
fixed plates being connected to one side of said
closed antenna, and a rotary plate connected to
the open antenna circuit and to said movable
contact on said switch, the fixed contact of said
switch being connected to one side of said re
sistance, the other side of said resistance being
connected to at least one of said ñxed plates,
means for closing said contacts to provide con
nections to one side of said closed antenna, the
resistance and said ñxed contact for placing said
of said loop and are oppositely disposed in re
spect to the center of said rotary plate, a pair
of contact members one of which is electrically
connected to said sense antenna and the rotary
plate and arranged on the base at right angles
to each of said ñxed plates and positioned in the
path of said rotary plate so as to make electrical
connection by closing said contacts when the ro
tary plate is rotated past the position beyond
the active capacity area of at least one of the
ñxed plates to electrically connect said sense an
tenna in series with said resistance which is
resistance in series with said open antenna cir- s electrically connected to one of said contacts,
cuit When said plate is rotated to an unbalanced and the other end oi said resistance being con
position in which said rotary plate substantially nected with one side of said loop- to indicate the
covers only the area of one of said fixed plates sense of direction of an incoming Wave when»20
to indicate the sense of direction of energy re
sponse.
6. In a radio direction ñnder comprising a
said rotary plate closes said contacts.
BENJAMIN L. DOLBEAR.
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