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Патент USA US2404012

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juEy E6, 1946“ ,
2,40%12
R. H. WORRALL
RADIO DIRECTION FINDER
Filed Dec. 8, 1938
49
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42
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2 Sheets-Sheet 1
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40 57
27
INVENTOR
Haber? H. WorraZZ
BY
A TTORNE Y
Juiy
ms.
2,40,12
R. H. WORRALL
RADIO DIRECTION FINDER
2 Sheets-Sheet 2‘
Filed Dec. 8, 1938
“a
/9
/6, 17/
24
I6, 17
60
_\
_ _ _ _ _
INVENTOR
'
Roberi H. WorraZZ
BY
'
____w
ATTORNEY
Patented July 16, 1946
2,404,012
UNITED STATES PATENT OFFICE
2,404,012
RADIO DIRECTION FINDER
Robert H. Worrall, Honolulu, Territory of Hawaii
Application December 8, 1938, Serial No. 244,710
13 Claims. (01. 250-11)
(Granted under the act of March 3, 1883, as
amended April 30, 19-28; 370‘ 0. G. 757)
1
My invention relates broadly to direction ?nd
ing means, and more particularly to an improved
type of radio direction ?nder.
An object of this invention is to provide an
improved type of radio direction ?nder which
can quickly and easily be disassembled for trans
portation, and readily reassembled, both mechan
ically and electrically.
2
This radio direction ?nder comprises the fol
lowing major parts: the dipole collector assem
bly, the horizontal shielding tube iii, the vertical
shielding tube 20, the tuning and balancing as
sembly. and shield, the coupling system and
shield, 'the bearing assembly, and the interior
connectors.
Horizontal shielding tube I9 supports the di
pole collector assembly arranged as a pair of
Another object of this invention is to provide
an improved type of radio direction ?nder espe 10 horizontally spaced vertical doublets, one doublet
cially suitable for use at high frequencies and
at each end. A saddle 23 is permanently secured
useful over a wide frequency range.
to the horizontal shielding tube I9 and its lower
Another object of this invention is to provide
portion is‘ a smooth, sliding ?t around the upper
an improved type of radio direction ?nder con
end of the vertical shielding tube 26, There is
structed and shielded so as to obtain complete 15 a locating slot in saddle 23 which engages with
electrical balance between any two correspond
pin 22, screwed into tube 26. Set screw 2| locks
ing parts and ground.
.Another object of this invention is to provide
saddle 23 to tube '20, Shielding enclosure 28,
which contains the tuning, balancing and series
condensers and the short-circuiting switches for
an improved type of radio direction ?nder which
minimizes polarization errors.
20 the latter, is secured around tube 28. The lower
end of tube 20 is supported in a ball bearing, the
A further object of this invention is to pro
lower half 6 of which is secured to the top of
vide an improved radio direction ?nder which is
shielding housing I3. At its lower end the ex
a separate yet complete unit in itself, and which
may be used with any well shielded radio re
teriordiameter of shaft 20 is reduced, forming a
ceiver.
25 shoulder 51, which rests upon the upper half 9
of the ball bearing. Set screws 26 secure vertical
It is well known to the art that the Adcock
tube 20 to the upper half 9 of the ball bearing.
The ball bearing is separable, the upper half 9
resting on balls ‘I which, in turn, are supported
refraction, than other types of radio direction
?nders. The system of Adcock direction ?nding 80 by the lower half 6. The tube 20 and the upper
herein employed is known as a differential system
half 9 of the bearing rotate about a vertical axis
while the lower half 6 of the bearing and the
of doublets, In such a system, good results de
shielding housing I3 remain ?xed. The dipoles
pend upon electrical and mechanical symmetry in
or collectors I6, I1, horizontal tube I9 and the
construction and upon proper shielding. How
shielding enclosure 28 all rotate with tube 213, An
this and the above and other objects are accom
azimuth scale 8 is secured to the upper half 9 of
plished is shown in the description below.
the bearing. An access door Ill, hinged at 21, and
Referring to the drawings,
locked closed by thumb latch I5, provides access
Fig. 1 is a view, partly in section, of the com
for changing the plug-in coupling coils 6i and
plete direction ?nder, except that the right half
of the dipole collector assembly and supporting 40 I I. The supported end of each of the four dipole
collector tubes I6 is ?tted with a threaded insert
shielding tube, which is exactly like the left half
53 ‘which screws on to terminal studs I8. These
illustrated, is omitted.
studs I8 are supported by and secured to insulat
Fig. 2 is an end view, partly in section, of the
ing strips 50, which are attached by angle ?ttings
dipole assembly showing the method of support
ing and bracing the dipole rods.
45 to tube I9. An extension rod I1 screws into the
Fig. 3 is a sectional view through the longitu
unsupported end of each dipole collector tube I6.
Insulating strips 41 and 52 form, with metal
dinal center of the horizontal shielding tube .at
corner braces 48 (Fig. 2), a bracing frame for
3-3, Fig. 1,
dipole collector tubes I6, and are held in position
Fig. 4 is an electrical schematic diagram of the
entire radio direction ?nder.
50 away from tube I9 by insulating pillars 49. The
Fig. 5 is a cutaway view looking down on the
ends of the tube I9 are covered by tightly ?tting
top of the horizontal shielding tube at 3, Fig. 1,
metal covers 46. Conductor wires 24 are attached
showing schematically how the conducting wires
to studs I8 and connect the two sets of dipole col
in the horizontal shielding tube have been ro
lectors I6, I‘! together in such a manner that the
tated until they are in a horizontal plane.
55 upper dipole collector I6, I7 of each doublet con
radio direction ?nder is less affected by polari
zation errors, i. e., so-called “night effect” and
2,404,012
3
4
shield tube I9, with saddle 23 secured thereto,
nects with the lower dipole collector l6, I‘! of the
lifts free from vertical tube 20 after set screw 2|
doublet at the opposite end of the tube l9, Each
is loosened, the locating pin 22 and shoulder 53
wire 24 rotates through 180 degrees in traveling
insuring that horizontal tube l9 will always as
from one pair of dipole collectors I6, I‘! to the
sume the same position on tube 20. Lifting‘, tube
other. These wires 24 are supported and guided
I9 straight up also frees wires 24 from spring
by a number of insulating spacers 42 which ?t
clips 25. The vertical shielding tube 20, with
tightly inside tube l9. There is machined into
shielding enclosure 28 and top half 9 of the ball
the rim of each spacer 42 a spline slot into which
bearing secured thereto, can then be lifted clear
longitudinal spline 43 engages when the spacers
42 are inserted inside the tube l9. Spline 43 is 10 of the lower half 6 of the ball bearing. Assembly
in the reverse order is also quickly and readily
attached inside and at the top of tube l9 by
accomplished, For lightness, tubes l9 and 20
screws 44. Each pair of spacers 42 is identical
can be made of Duralumin.
except that the slot is shifted along the circum~
The operation of this radio direction ?nder is
ference a de?nite number of degrees from the
vertical varying from 0 degrees to 90 degrees, de 15 as follows: (refer to Fig. 4) Radio waves striking
the collector induce currents in the dipole col
pending on the position of the spacer or guide 42
lectors l 5, H, in the shielding members I9 and 20,
along the tube It‘. The angular displacement of
and also in the room screen 60 (Fig. 4), if used.
the slot on the spacers 42 nearest the longitu
The currents induced in the dipole collectors I6,
dinal center of tube I9 is 0 degrees from the ver
tical, and this angle is increased gradually on 20 I? are, of course, the desired currents. The cur
rents induced in the shielding tubes I9 and 20 in
each spacer 42 along the tube l9 until on the
turn induce currents into wires 24 and 3|, the
spacer 42 nearest each end of the tube l9, the
coils and the other components within the shields
angle is 90 degrees. Thus, by means of these
i9, 20 and I3. These latter currents set up what
spacers 42 the common plane of conductor wires
24 is uniformly rotated from the vertical at the 25 is commonly called "antenna effect.” The eifect
of such currents is to induce a signal into the
ends of tube !9 to the horizontal half way be
receiver at all times regardless of the position to
tween the ends. At the longitudinal midpoint
which the collector is rotated. The “antenna
of tube l9 a spring clip 25 engages the exact elec
effect” is eliminated in this radio direction ?nder
trical center of each of the conductor wires 24.
by so designing and constructing the collector
These clips are mounted on terminals 4|, which
that, without any balancing condenser 35 in the
are supported by insulating disc 56. This disc 56
circuit, there is complete electrical balance be
is a close ?t inside the upper end of tube 20 and
tween any two corresponding parts of the circuit
rests upon a shoulder 53. A terminal stud 45
and ground. After this is achieved, the balancing
screws into the bottom of each of the two ter
minals 4! and to these studs the upper ends of 35 condenser is inserted in the circuit to balance out
the small currents which inevitably appear in
down lead wires 3| are connected. The tautness
actual operation. The design and construction
of wires 3! inside vertical shielding tube 20 can
of this radio direction ?nder has approached
be adjusted by screwing terminal studs 45 in or
perfect electrical balance so closely in actual
out of terminals 4|. The electrical circuit of
operation that the maximum capacity of the bal
down lead wires 3| is interrupted by the inser
ancing condenser 35 used in this system is only
tion in each wire of a strain insulator 32. Wires
4.4 micromicrofarads on each side, while the aver
3! connect to terminal studs 54 which screw into
age maximum balancing capacity necessary to
each end of insulators 32. Each insulator 32 is
use is less than plus or minus 0.2 micromicrofarad
?tted with connectors 33 by means of which the
upper and lower portions of wires 3| are con 45 over the entire frequency range. The undesir
nected to the tuning and balancing assembly.
able antenna effect thus eliminated, there remains
the desired current induced in the four dipole
The lowermost end of each wire 3| connects to a
collectors I6, H. The desired current travels
special terminal [0 which is drilled to receive
along wires 24 and 3! to the tuning and balancing
plug-in coils 6| of standard manufacture, Ter
minals H] are supported by insulating disc 5|
system and to coil 6|, inducing in coil l l a similar
current which flows to the receiver input through
which ?ts tightly inside the lower end of tube 20
and rests against shoulder 59. Each of the two
suitable shielded leads. The system is tuned to
the desired frequency by condenser 36 and is bal
series tuning condensers 34 is connected to a pair
of terminals 33. A cam operated short-circuiting
anced by condenser 35 for the sharpest bearings.
On one frequency band, because of the electrical
switch 39 is mounted on the frame of each con-1
constants of the system, it is necessary to insert
denser 34 and one terminal of each switch is con
nected to a separate group of stator plates of bal
series condensers 34 in the circuit. These con
ancing condenser 35. The rotor plates of balanc
densers are short-circuited when not required by
ing condenser 35 are grounded to the shield.
low capacitance, low-loss switches 39, both
Knob 37 is mounted on the rotor shaft of balanc 60 switches cam operated simultaneously by a single
ing condenser 35. Tuning condenser 36 is con
knob. Condenser 38 is adjusted until the capacity
nected across down lead wires 3!. iA. small var
of the stator plates of tuning condenser 36 to
iable condenser 38, shown only in Fig. 4, is con
ground is equal to the capacity of its rotor plates
and shield to ground. While the output of the
nected between condenser 36 and the shield, An
electrostatic shield 12 is mounted inside coil 65 radio direction ?nder illustrated is magnetically
shield box 13 between coils BI and coil ll. Coil
coupled to the receiver input, other types of couI I, also of standard manufacture, plugs into jacks
pling may be successfully employed. This radio
mounted on insulating support 30, which is se
direction ?nder is useful over a frequency range
cured to brackets 29 extending from shielding
from 3,000 to 30,000 kcs. and its range may be
housing l3.
70 extended in either direction. This frequency
This radio direction ?nder is made readily
coverage is made possible by the use of plug-in
transportable by its lightness and ease of assem
coils.
The sequence of operation for taking bearings
bly and disassembly. To disassemble, dipole col
with this radio direction ?nder is as follows,
lectors IS with their inserted extensions I‘! are
assuming the approximate frequency is known,
unscrewed from terminal studs l8. Horizontal
2,404,012
5
the proper plug-in coils inserted and the equip
ment calibrated. First, set balancing condenser
35 at maximum position on either side. This
introduces sui?cient unbalance to make the col
lector function as a good antenna. Second, set
tuning condenser 36 for the approximate fre
quency. Third, tune the receiver around the-ap
proximate frequency until a signal is heard.
Fourth, tune condenser 36 for maximum signal.
Fifth, adjust condenser 35 for minimum signal
while rotating the loop. Sixth, make ?nal ad
justments of the receiver, condensers 35 and ‘3-6.
Seventh, rotate loop to position of minimum
signal.
It will be understood that the above descrip
each :end .on said horizontal shielding tube and
“insulated'therefrom and from each other, a-con
ductor inside said horizontal-shielding tube con
necting each said upper collector to said lower
collector :at the opposite ,end of said horizontal
shielding tube, insulating guide means ‘to rotate
the common plane of said conductors from the
vertical at each end of said horizontal shielding
tube to the horizontal at its center, two down
leads ‘extending through said vertical shielding
tube,1?xed1c1ip meansconnected to said down leads
so located as 'to engage said conductors in said
horizontal shielding tube at the exact center of
each, a series condenser connected in each said
15 down lead, a low ‘capacity switch ‘to ‘short circuit
each said series condenser, a ‘variable balancing
condenser having a separate stator connected ‘to
each said down lead :and a rotor connected to
invention and that various changes ‘in construc
said vertical shiel-ding'tube, a variable tuning con
tion, proportion and arrangement of the parts
may be made within the scope of the ‘appended 20 denser connected across said down leads, a vari
able condenser connected between said tuning
claims without sacri?cing any of the advantages
condenser and said vertical shielding tube to
of my invention.
make the capacity of the stator of said tuning
tion and accompanying drawings comprehend
only ‘the general and preferred embodiment of my
The invention described herein may be manu
factured and/or used by or for the Government
of the United States of America for governmental
purposes without the payment of any royalties
thereon or therefor.
What I claim and desire to secure by Letters
Patent, is as follows:
1. Direction ?nding means, comprising a
shielding housing, a detachable vertical shielding
tube rotatably mounted thereon, a horizontal
shielding tube detachably mounted at its longi~
tudinal center on said vertical tube, an upper
and a lower vertical detachable collector secured
at each end on said horizontal shielding tube and
insulated therefrom and from each other, a con
ductor inside said horizontal shielding tube con
necting each said upper collector to said lower
collector at the opposite end of said ‘horizontal
shielding tube, insulating guide means to rotate
the common plane of said conductors from the
vertical at each end of said horizontal shielding
tube to the horizontal at its center, two down
condenser to ground ‘equal the capacity of its
rotor and shield to ground, a shielding enclosure
‘for ‘said ‘condensers and switches, a rotatable
plug-in coil disposed in said shielding ‘housing
connected to said down leads and rotating with
said vertical shielding tube, a ?xed plug-‘in ~coil
mounted in said shielding :‘housing below said ro
tatable plug-in coil and ‘magnetically coupled
‘thereto, an electrostatic shield disposed between
said plug-in coils, an access opening in ‘said
shielding housing with a closure :therefor,»and an
azimuth scale attached to said vertical shielding
~
tube.
3. Direction ?nding means, comprising .a
shielding housing, a detachable vertical shielding
tube rotatably ‘mounted thereon, a horizontal
shielding tube detachably ‘mounted (at its longi
40
tudinalcenter on said vertical tubepan ‘upper and
a lower vertical detachable collector secured at
each end on said horizontal shielding tube and
insulated therefrom and from each ‘other, :a-con
ductor inside said horizontal shielding tubecon
leads extending through said vertical shielding 45 necting each said upper ‘collector to-said lower ,
tube, ?xed clip means connected to said down
leads so located as to engage said conductors in
said horizontal shielding tube at the exact center
of each, a series condenser connected in each said
down lead, a low capacity switch to short cir
cuit each said series condenser, a variable bal
ancing condenser having a separate stator con
nected to each said down lead and a rotor con
collector at the opposite end of said horizontal
shielding tube, insulating guide means to rotate
the common plane of said conductors from the
vertical :at "each end of :said horizontal shielding
tube .to the horizontal at its center, two down
leads extending through said verticalshielding
tube, ?xed clip means connected to said down
leads so located as to engage said conductors-in
nected to said vertical shielding tube, a variable
said horizontal shielding tube at the exact center
tuning condenser connected across said down 55 of each, a series condenser connected insi-ea'ch
leads, a variable condenser connected between
said down lead, a low capacity switch to short
said tuning condenser and said vertical shielding
circuit each said series condenser, a variable v‘bal
tube to make the capacity of the stator of said
ancing condenser having a separate stator con-, tuning condenser to ground equal the capacity
nected to each said ‘down lead and a rotor con
of its rotor and shield to ground, a shielding en 60 nected ‘to said vertical shielding tube, a variable
closure for said condensers and switches, a- ro
tuning condenser connected across said down
tatable coil disposed in said shielding housing
leads, a variable condenser connected between
connected to said down leads and rotating with
said tuning condenser and said vertical shielding
said vertical shielding tube, a ?xed coil mounted
tube “to make the capacity of the stator of said ,
in said shielding housing below said rotatable coil 65 tuning condenser to ground equal the capacity '
and magnetically coupled thereto, an electro
of its rotor and shield to ground, a shielding-en- .
static shield disposed between said coils, and an
closure for said condensers and switches, and an
azimuth scale attached to said vertical shielding
azimuth scale ?xed on said vertical shielding
tube.
ube.
2. Direction ?nding means, comprising a 70 4. Direction ?nding means, 1 comprising a
shielding housing, a detachable vertical shielding
shielding housing, an access opening therein and
tube rotatably mounted thereon, a horizontal
closure therefor, a vertical shielding tube rotat
shielding tube detachably mounted at its longi
ably mounted on said housing in a separable
tudinal center on said vertical tube, an upper and
bearing, the lower .half of said bearing secured
a lower vertical detachable collector secured at 75 to .said.'.housing,.the :upper half secured .to said
2,404,012
7
8
vertical tube, said vertical tube and upper half
of said bearing detachable by lifting, a saddle
ing tube, a variable tuning condenser connected
across said down leads, a variable condenser con
means slidingly ?tted 0n the upper end of said ~ ‘ nectedbetween said tuning condenser and said
vertical tube and detachably secured thereto, a
horizontalshielding tube ?xedly secured at its
longitudinal center to said saddle means and sup- ~
ported thereby, an upper and a lower vertical de
tachable collector supported at each end of said
vertical shielding tube to make the capacity of
the stator of said tuning condenser to ground
equal the capacity of its rotor and shield to
ground, a shielding enclosure for said condensers
and switches, and an azimuth scale attached to
said vertical shielding tube,
horizontal shielding tube and insulated therefrom
6. Direction ?nding means, comprising a col
and from each other, a conductor inside said hor 10
lector system of dipoles arranged as two horizon
~ izontal shielding tube connecting each said up
per collector to said lower collector at the op- ,
tally spaced vertical doublets, a rotatable T
posite end of said horizontal shielding tube, in
shaped support formed by a horizontal and a
~ sulating guide means to rotate the common plane
vertical tubular shielding member, a balanced
horizontal transmission line connecting the up
of said conductors from the vertical at each end
of said horizontal shielding tube to the hori
per dipole collector of each doublet with the lower
, zontal at its center, two down leads extending
dipole collector of the other, a balanced vertical
through said vertical shielding tube, ?xed clip
transmission line detachably connected by clip
means to the exact electrical center of said hori
means connected to said down leads so located
as to engage said conductors in said horizontal 20 zontal transmission line, said transmission lines
contained inside said shielding tubular members,
tuning and balancing means connected to said
vertical transmission line with a shielding enclo
, down lead, a low capacity switch to short circuit
each said series condenser, a variable balancing
sure therefor, a shielding housing, coupling
condenser having a separate stator connected to 25 means for said vertical transmission line disposed
within said shielding housing, said dipole col
each said down lead and a rotor connected to
said vertical shielding tube, a variable tuning con
lectors, tubular shielding members, shielding en
shielding tube at the exact ~electricalcenter of
each, a series condenser connected in each said
closure and shielding housing symmetrically dis
posed about a vertical plane through said dipole
able condenser connected between said tuning
condenser and said vertical shielding tube to 30, collectors, said dipole collectors, tubular shielding
make the capacity of the stator of said tuning
members and shielding housing symmetrically
condenser to ground equal the capacity of its
disposed about a vertical plane through the axis
rotor and shield to ground, a shielding enclosure
of said vertical tubular shielding member per
for said condensers and switches, a rotatable in- ‘ ‘ pendicular t0 the axis, of said horizontal shield
sulated coil mounting ?xed in the lower end of 35 ing tubular member, said dipole collectors and
horizontal shielding tubular member symmetri
said vertical shielding tube and connected to said
down leads, a rotatable coil disposed in said ‘
cally disposed about a horizontal plane through
shielding housing and plugging in to said rotat
the axis of said horizontal‘ shielding tubular
able coil‘ mounting, a ?xed coil mounting and
member, said dipole collectors, tubular shielding
plug-in coil secured in said shielding housing be
members and shielding housing being detachable.
low said rotatable coil, said ?xed and said ro
'7. Direction ?nding means, comprising a col
tatable coils coupled magnetically, an electro
lector system of dipoles arranged asv two hori
static shield disposed between said coils, and an
zontally spaced vertical doublets, a rotatable T
azimuth scale attached to said vertical shielding
shaped support formed by a horizontal and a ver
tube.
45 tical tubular shielding member, a balanced hori
5. Direction ?nding means, comprising a
zontal transmission line connecting the upper di
shielding housing, a vertical shielding tube ro
pole collector of each doublet with the lower di
tatably mounted on said housing in a separable
pole collector of the other, a balanced vertical
bearing, the lower half of said bearing secured
transmission line detachably connected by‘clip
to said housing, the upper half secured to said
means to the exact electrical center of said hori
vertical tube, said vertical tube and upper half
zontal transmission line, said transmission lines
of said bearing detachable by lifting, a saddle
contained inside said shieldingtubular‘membe‘rs,
means slidingly ?tted on the upper end of said
tuning and balancing means connected to said
vertical tube and detachably secured thereto, a
vertical transmission line with a shielding en
horizontal shielding tube ?xedly secured at its
closure therefor, a shielding housing, coupling
longitudinal center to said saddle means and sup
means for said vertical transmission line disposed
denser connected across said down leads, a vari
ported thereby, an upper and a lower vertical
detachable collector supported at each end of said
within said shielding housing, said dipole col
lectors, tubular shielding members and shielding
horizontal shielding tube and insulated there
housing being detachable.
from and from each other, a conductor inside
said horizontal shielding tube connecting each
8. Direction ?nding means, comprising a
collector system of dipoles arranged as two hori
said upper collector to said lower collector at the
zontally spaced vertical doublets, a rotatable T,
opposite end of said horizontal shielding tube, in
sulating guide means to rotate the common plane
of said conductors from thevertical at each end
of saidhorizontal shielding tube to the horizontal
at its center, two down leads extending through
said vertical shielding tube, ?xed clip means con
nected to said down leads so located as to engage
‘
‘
shaped support formed by a horizontal and a
vertical tubular shielding member, a balanced
horizontal transmission line connecting the up
per dipole collector of each doublet with the lower
dipole collector of the other, a balanced vertical
transmission line detachably connected by clip
means to the exact electrical center of said hori
said conductors in said horizontal shieldingv tube
at theexact electrical center of each, a series con 70 zontal transmission line, said transmission lines
contained inside said shielding tubular members,
denser connected in each said down lead, a’ low
tuning and balancing means connected to said
capacity switch to short circuit each said series
vertical transmission line with a shielding en
condenser, a variable balancing condenser hav,
closure therefor, a shielding housing, coupling
ing a separate stator connected to each said down
lead and a rotor connected to saidvertical shield 75 means for said vertical transmission line- dis
2,404,012
posed within said shielding housing, and an azi
muth scale attached to said vertical shielding
tubular member, said dipole collectors, tubular
shielding members and shielding housing being
detachable.
9. Direction ?nding
means,
comprising
a
shielding housing, a detachable vertical shielding
tube rotatably mounted thereon, a horizontal
shielding tube detachably mounted at its longi
10
said down lead, a low‘ capacity switch to short
circuit each said series condenser, a variablebal- ,
ancing- condenser having a separate stator con- ‘
nected to each said down lead and a rotor con:
nected to said vertical shielding tube, a variable
tuning condenser connected across said down
leads, a variable condenser connected between
said tuning condenser and said vertical shield
ing tube to make the capacity of the stator of
tudinal center on said vertical tube, an upper and 10 said tuning condenser to ground equal the capac
a lower vertical detachable collector secured at
ity of its rotor and shield to ground, a shielding
each end on said horizontal shielding tube and
enclosure for said condensers and switches, a ro
insulated therefrom and from each other, a con
tatable plug-in coil disposed in said shielding
ductor inside said horizontal shielding tube con
housing connected to said down leads and rotat-f
necting each said upper collector to said lower 15 ing with said vertical shielding tube, a ?xed plug
collector at the opposite end of said horizontal
in coil mounted in said shielding housing below
shielding tube, insulating guide means to rotate
said rotatable plug-in coil and magnetically cou
the common plane of said conductors from the
pled thereto an electrostatic shield disposed be
vertical at each end of said horizontal shielding
tube to the horizontal at its center, two down
leads extending through said vertical shielding
tube, ?xed clip means connected to said down
tween said plug-in coils,’ an access opening in said
shielding housing with a closure‘ therefor, and
an azimuth scale attached to said vertical shield
ing tube, said‘ collectors, shielding tubes, shield
ing enclosure and shielding housing symmetri
said horizontal shielding tube at the exact cen
cally disposed about ‘a vertical plane through said
ter of each, a series condenser connected in 25 collectors, said collectors, shielding ‘tubes and
leads so located as to engage said conductors in
each said- down lead, a low capacity switch to short
circuit each said series condenser, a variable bal
ancing condenser having a separate stator con
nected to each said down lead and a rotor con
nected to said vertical shielding tube, a variable
tuning condenser connected across said down
leads, a variable condenser connected between
said tuning condenser and said vertical shielding
tube to make the capacity of the stator of said
tuning condenser to ground equal the capacity of
shielding housing symmetrically disposed about
a vertical plane through the axis of said vertical '
shielding tube perpendicular to the axis of’ said
horizontal shielding tube, said collectors and hori
zontal' shielding tube symmetrically disposed
about a horizontal plane through the axis of said
horizontal shielding tube;
,
l'l. Direction ?nding 'means, comprising a
shielding housing, a detachable vertical shield
ing tube rotatably mounted thereon, a horizon
tal shielding» tube d'etachably mounted at its
longitudinal center on said vertical tube, an
upper and a lower vertical detachable collector
its rotor and shield to ground, a shielding en
closure for said condensers and switches, a rotat
able coil disposed in said shielding housing con
nected to said down leads and rotating with said
secured at each end? on‘said horizontal shielding
vertical shielding tube, a ?xed coil mounted in 40 tube and insulated therefrom and from, each
said shielding housing below said rotatable coil
other, a conductor inside said horizontalshield
and magnetically coupled thereto, an electro—
ing’ tube connecting each said upper collector to
static shield disposed between said coils, and an
said: lower collector at the opposite end of said
azimuth scale attached to said vertical shielding
horizontalshield-ing tube, insulating guide means
tube, said collectors, shielding tubes, shielding 45 to rotate the common plane of said conductors
enclosure and shielding housing symmetrically
from the vertical at each end of said horizontal
disposed about a vertical plane through said col
shielding tube to the horizontal at its center, two
lectors, said collectors, shielding tubes and shield
ing housing symmetrically disposed about a ver
tical plane through the axis of said vertical
shielding tube perpendicular to the axis of said
horizontal shielding tube, said collectors and
horizontal shielding tube symmetrically disposed
about a horizontal plane through the axis of said
horizontal shielding tube.
down- leads extending through said vertical shield
ing tube, ?xed clip means connected to said down
leads so located as to engage said conductors in
said horizontal shielding tube at the exact cen
ter‘ of each, a series condenser connected in-eeajch
said down‘ lead, a low capacity switch to short
circuit each said series condenser, a variable bal
ancing condenser having a separate stator con
nected to eachsai'd down lead and a rotor con
shielding housing, a detachable vertical shielding
nected-to said vertical shielding tube, a variable
tube rotatably mounted thereon, a horizontal
tuning condenser connected across said down
shielding tube detachably mounted at its longi
leads, a variable condenser connected between
tudinal center on said vertical tube, an upper and 60 said tuning condenser and said vertical shielding
a lower vertical detachable collector secured at
tube to make the capacity of stator of said tuning
each end on said horizontal shielding tube and
condenser to ground equal the capacity of its
insulated therefrom and from each other, a con
rotor and shield to ground, a shielding enclosure
10. Direction ?nding means, comprising a
ductor inside said horizontal shielding tube con
necting each said upper collector to said lower
collector at the opposite end of said horizontal
shielding tube, insulating guide means to rotate
the common plane of said conductors from the
vertical at each end of said horizontal shielding
tube to the horizontal at its center, two down
leads extending through said vertical shielding
for said condensers and switches, and an azimuth
scale ?xed on said vertical shielding tube, said
collectors, shielding, tubes, shielding enclosure
and shielding housing symmetrically disposed
about a vertical plane through said collectors,
said collectors, shielding tubes and shielding
tube, ?xed clip means connected to said down
housing symmetrically disposed about a vertical
plane through the axis of said vertical shield
leads so located as to engage said conductors in 4
ing tube perpendicular to the axis of said ho-ri- ,
zontal shielding tube, said collectors and horizon
said horizontal shielding tube at the exact center
of each, a series condenser connected in each 75 tal shielding tube symmetrically disposed about
2,404,012
11
a horizontal plane through the axis of said hori
zontal shielding tube.
12. Direction ?nding means, comprising a
shielding housing, an access opening therein and
12
said vertical shielding tube perpendicular to the
axis of said horizontal shielding tube, said col
lectors and horizontal shielding tube symmetri
cally disposed about a horizontal plane through
the axis of said horizontal shielding tube.
closure therefor, a vertical shielding tube rotat
13. Direction ?nding means, comprising a
ably mounted on said housing in a separable bear
shielding housing, a vertical shielding tube rotat
ing, the lower half of said bearing secured to said
ably mounted on said housing in a separable bear
housing, the upper half secured to said vertical
ing, the lower half of said bearing secured to ‘said
tube, said vertical tube and. upper half of said
bearing detachable by lifting, a saddle means slid 10 housing, the upper half secured to said vertical
tube, said vertical tube and upper half of said
ingly ?tted on the upper end of said vertical tube
bearing detachable by lifting, a saddle means
and detachably secured thereto, a horizontal
slidingly ?tted on the upper end of said vertical
shielding tube ?xedly secured at its longitudinal
tube and detachably secured thereto, a horizontal
center to said saddle means and supported there
by, an upper and a lower vertical detachable col 15 shielding tube ?xedly secured at its longitudinal
center to said saddle means and supported there
lector supported at each end of said horizontal
by, an upper and a lower vertical detachable
shielding tube and insulated therefrom and from
collector supported at each end of said horizontal
each other, a conductor inside said horizontal
shielding tube and insulated therefrom and from
shielding tube connecting each said upper col
lector to said lower collector at the opposite end 20 each other, a conductor inside said horizontal
shielding tube connecting each said upper col
of said horizontal shielding tube, insulating guide
lector to said lower collector at the opposite end
means to rotate the common plane of said con
of said horizontal shielding tube, insulating guide
ductors from the vertical at each end of said hori
means to rotate the common plane of said con
zontal shielding tube to the horizontal at its cen
ductors from the vertical at each end of said
ter, two down leads extending through said verti
horizontal shielding tube to the horizontal at its
cal shielding tube, ?xed clip means connected to
said down leads so located as to engage said con
ductors in said horizontal shielding tube at the
exact electrical center of each, a series condenser
connected in each said down lead, a low capac
ity switch to short circuit each said series con
denser, a variable balancing condenser having a
separate stator connected to each said down lead
and a rotor connected to said vertical shielding
tube, a variable tuning condenser connected 35
center, two down leads extending through said
vertical shielding tube, ?xed clip means con
nected to said down leads so located as to engage
said conductors in said horizontal shielding tube
at the exact electrical center of each, a series
condenser connected in each said down lead, a
nected between said tuning condenser and said
low capacity switch to short circuit each said
series condenser, a variable balancing condenser
having a separate stator connected to each said
down lead and a rotor connected to said vertical
shielding tube, a variable tuning condenser con
vertical shielding tube to make the capacity of the
nected across said down leads, a variable con
across said down leads, a variable condenser con
denser connected between said tuning condenser
stator of said tuning condenser to ground equal
the capacity of its rotor and shield to ground, a 40 and said vertical shielding tube to make the ca
pacity of the stator of said tuning condenser to
shielding enclosure for said condensers and
ground equal the capacity of its rotor and shield
switches, a rotatable insulated coil mounting ?xed
to ground, a shielding enclosure for said con
in the lower end of said vertical shielding tube and
densers and switches, and an azimuth scale at
connected to said down leads, a rotatable coil dis
posed in said shielding housing and plugging in 45 tached to said vertical shielding tube, said 001
lectors, shielding tubes, shielding enclosure and
to said rotatable coil mounting, a ?xed coil
shielding housing symmetrically disposed about
mounting and plug-in coil secured in said shield
a vertical plane through said collectors, said col
ing housing below said rotatable coil, said ?xed
lectors, shielding tubes and shielding housing
and said rotatable coil coupled magnetically, an
electrostatic shield disposed between said coils, 50 symmetrically disposed about a vertical plane
through the axis of said vertical shielding tube
and an azimuth scale attached to said vertical
perpendicular to the axis of said horizontal shield
shielding tube, said collectors, shielding tubes,
ing tube, said collectors and horizontal shield
shielding enclosure and shielding housing sym
ing tube symmetrically disposed about a horizon-1
metrically disposed about a vertical plane
tal plane through theaxis of said horizontal
through said collectors, said collectors, shielding
shielding tube.
tubes and shielding housing symmetrically dis
posed about a vertical plane through the axis of
ROBERT H. WORRALL.
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