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Патент USA US2412959

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4Dec. 24, 1946.
H. c, BAUMANN
2,412,959
RADIO DIRECTIONFINDER SYSTEM
Filed May l, 1943
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SEA/SE ANTE AEl”
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Patented Dec. 24,1946
2,412,959
UNITED STATES PAENT. OFFICE
2,412,959
RADIO DIRECTION FINDER SYSTEM
Harold C. Baumann, Elizabeth, N. J., assignor to
Federal rl‘elephorle & Radio Corporation, New
York, N. Y., a corporation of Delaware
Application May 1, 1943, Serial No. 485,273
6 Claims. (Cl. 250-11)
This invention relates to radio direction finders
and especially to direction ñnding systems which
utilize both a directional antenna and a sense
antenna.
In systems of this type the impulses
received on the sense antenna are combined with
2
antenna circuits, uniform high eiiiciency and
accuracy'are obtained. This permits the design
and adjustment of the antenna systems to re
ceive a wide band of frequencies, and specifically
impulses from the directional antenna to show , the use of band switching arrangements, without
affecting the eiiiciency or operation of the phase
the directional sense of the line of direction
shifting network. Moreover, the losses which are
which may be >derived from the latter impulses
inevitable in the use of such a network are in~1
alone; that is, to show which end of said line
points toward the transmitter. For this purpose 10 serted in the intermediate frequency portion of
the 'circuits,.where they arenot as important,
the sense antenna impulses must be `shifted in
instead of in the radio frequency circuits, Where
phase until they are in phase opposition with
they may seriously affect eiiîciency.
.
one of the maxima of the directional antenna
Other objects and advantages will appear from
impulses and in phase with the other maximum.
For this purpose the receiving channel con 15 the following description considered in, connec~
tion with the accompanying drawing which illus--nected to the sense antenna is coupled to the di
trates one embodiment of the invention in dia~
rectional antenna receiving channel through a
srammatic form.
~
phase shifting network, and the combined im
pulses are passed through suitable amplifying
In this embodiment the sense antenna I0 is
and detecting circuits to operate a direction in 20 coupled through a radio frequency amplifier I I
toan‘ intermediate frequency mixer or converter
dicator. It has been found that when the various
.I2-coupled to oscillator I3 in the usual manner.
wavelengths of different transmitting stations to
Directional antennaY Ie is coupled through radio
which the antennae may be tuned vary substan
frequency amplifier I5 to the intermediate fre
tially in frequency, the operation and effect of
the phase shifting network are affected, and 25 quency mixer or converter I6, which likewise
is coupled to oscillator I3. The output fre
compensation of some type is desirable. More
quencies of mixer I2 and I6 will therefore be the
over, the network introduces a loss in the radio
same, each modulated by the amplified impulses
frequency circuits that tends to reduce eiiiciency.
received from the respective antennas.
A purpose of the invention is to provide a re
The output of mixer I6 is modulated by the
ceiving and amplifying system for direction find 30
output of mixer I2 through a phase shift network
ers of the indicated type in which the phase
Il arranged to adjust the phase of impulses from
shifting network is unaffected by changes in in«
mixer I2 to synchronism with those from mixer
coming signal frequency. Other objects are to
I6 in a well known manner. The network dis
eliminate losses due to said network in the radio
closed includes capacitor I8 and variable re
frequency circuits which may affect efficiency,
sistor I9 in series in line 20 connecting the out
and to provide a better signal to noise ratio.
put circuits of said mixers. The output circuit
These purposes are in general accomplished by
of mixer I6 is coupled through transformer 2I
employing a superheterodyne amplifier with sep
to intermediate frequency amplifier 22 whose
arate mixer or frequency converter tubes in each
of the separate antenna circuits, and connecting 40 output is converted in known manner into a form
suitable for operating a direction indicator, as by
the phase shifting network between the mixer
an audio frequency detector and amplifier sys
tube output to modulate the directional antenna
tem 23 coupled to direction finder 24 which may
output impulses with impulses from the sense
be a cathode ray tube.
antenna in proper phase to produce a resultant
While a preferred embodiment has been de
impulse which will indicate the sense of the line 45
scribed, this has been done by way of illustration
of direction on the indicator. The modulated
and not limitation since other arrangements and
output is passed through a suitable intermediate
frequency ampliñer followed by any suitable type
of detecting and amplifying system adapted to
operate a, direction indicator such as a cathode 50
ray tube.
This arrangement has several advantages. By
operating the phase shift network only at the
constructions may be employed without depart
ing from the scope of the invention as set forth
in the claims.
What is claimed is:
1
1. A radio direction finder system including a
receiving circuit arranged for coupling to a non
directional antenna means, a receiving circuit
arranged for coupling to a directional antenna
ñxed intermediate frequency regardless of
changes in the frequency of the signals in the 55
means, frequency converting means for convert
2,412,959
3
ing the signal Waves in each receiving circuit t0
the same intermediate frequency, output circuits
for said frequency converting means, phase shift
4
means directly connected with the output of one
of the frequency converting means, means for
combining the intermediate frequency WavesI
from the outputs of said frequency converting
ing means in one of said output circuits, means
means in a common circuit, a single intermediate
for combining the intermediate frequency Waves Ul frequency amplifier coupled With the combining
from said output circuits in a common circuit,
means, and a single detector and indicator cir
and a single detector and indicator circuit
cuit coupled to said intermediate frequency
coupled to said common circuit.
amplifier.
2. A radio direction finder system including a
5. A radio direction finder system including a
10
receiving circuit arranged for coupling to a sense
receiving circuit arranged for coupling to a sense
antenna, a receiving circuit arranged for
antenna, a receiving circuit arranged for cou
coupling to a directional antenna, means for ccn
pling to a directional antenna, means for con
verting signal Waves in each circuit to a common
verting signal waves in each circuit to a common
intermediate frequency, means directly connected
15
intermediate frequency for shifting the phase of
with the converting means and operative on said
intermediate frequency, means operative on said
the intermediate frequency waves from the sense
antenna circuit into phase synchronisrn with the
intermediate frequency for shifting the phase of
the intermediate frequency Waves from the sense
intermediate frequency waves from the direc
antenna Acircuit into phase synchronism with the
tional antenna circuit, means for combining thc
intermediate frequency Waves from the direc
Waves from both circuits in a common circuL, 20 tional antennav circuit, means f_or combining the
and a single detector and indicator circuit
waves from both circuits in a common circuit, a
coupled to said common circuit.
single intermediate frequency amplifier coupled
3. A radio direction finder system including a
with the combining means, and a single. de;
receiving circuit arranged for coupling to av sense
tector and indicator circuit coupled to said inter
antenna, a receiving circuit arranged for cou
mediate frequency amplifier.
'
pling to a directional antenna, means for sep
6. A radio direction finder system inciuding a
arately converting signal Waves in each circuit
receiving circuit arranged for coupling toa sense
to the same intermediate frequency including a
antenna, a receiving circuit arranged for cou
mixer tube in each circuit, an intermediate fre~
pling to a directional antenna, means for sep
30
quency oscillation generator associated with both
arately converting signal Waves in each circuit
mixer tubes, a phase shifting network connected
to the same intermediate frequency including a
between the output circuits of the'mixer tubes,
mixer tube in each circuit, an intermediate fre
an intermediate frequency amplifier coupled to
quency oscillation generator associated with both
the output circuit of one of said tubes and a
mixer tubes, a phase shifting network connected
single detector and indicator circuit coupled to 35 between the output circuits of the mixer tubes
the Vintermediate frequency amplifier circuit.
and combining the Wavesv from both circuits, a
4. A radio direction finder system including a
single intermediate frequency amplifier circuit
receiving circuit arranged for coupling to a non
coupled to the output circuit of one of said tubes,
directional antenna means, a receiving circuit
and a single detector and indicator circuit: cou
arranged for coupling to a directional antenna 40 pled to the intermediate frequency amplifier
means, frequency converting means for convert
ing the signal Waves in each receiving circuit to
HAROLD C.k BAUMANN.
the same intermediate frequency, phase shifting
circuit.
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