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Патент USA US2105534

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Jan. V18, 1938.
.
H_ JOHANNSON
RADIO RECE IVING ARRANGEMENT
Filed May 24, 1935
-
2,105,534
Patented Jan. 18, 1938
23105534
UNITED STATES i’ATENT OFFICE
2,105,534
.
RAD-I0 RECEIVING ARRANGEMENT
Helmut Johannson, Berlin-Charlottenburg, Ger
many, assigner to C‘. Lorenz Aktiengesellschaft,
Berlin-Tempelhof, Germany, a company
Application May 24, 1935, Serial No. 23,169
In Germany August 14, 1934
2 Claims. (Cl. Z50-20)
In radio receiving arrangements for radio signals are received by the detector G2. The
beacons, in the interests of effecting a saving of output circuits of GI and G2 are respectively con
Weight and space, it has been proposed to use
one and the same low frequency portion of the
Cil receiver for the amplification of different signals.
Thus, for example, a separate high frequency
amplifier and detector have been provided for
receiving the actual radio beacon signals which
' indicate the deviation to the right or left and a
further high frequency receiver or detector has
been provided for receiving the initial signals
'or radiations from the radio beacon. The low
frequency circuits have however, in order to save
l0 '
as much weight and space as possible, been com
prised in a common low frequency amplifier. The
details of the high frequency and detector circuits
are not of interest in connection with the inven
tion under consideration. It may, however, be
mentioned that the broad principle of the inven
20 tion can be used for other purpose than the re
ception from radio beacons.
The receiving arrangements which have hither
to been suggested for the above-mentioned pur
poses, incorporate volume control methods which
25 are in themselves known and which are based
on rectifying, in the output circuit of the low
frequency portion of the receiver, a part of the
low frequency energy, and controlling, by means
of the derived direct potential, the sensitivity of
30 the high frequency amplifier or detector; that
is to say, the high frequency portion which re
ceives the actual radio beacon signals and the
receiver which receives the initial signals are
controlled in the same manner. In another sug
35 gested arrangement, the common low frequency
ampliñer is regulated. This has the disadvantage
that when approaching the initial >signal emitter,
or when flying over it, the sensitivity of the re
ceiver for reception of the actual radio beacon
40 signals is simultaneously decreased.
According to the invention amplitude or volume
regulation is controlled solely by one of the sig
nals, for example, the actual signals from the
radio beacon.
45
The accompanying drawing shows one ern
bodiment of an arrangement according to the
invention. The radio beacon signals are received
by the antenna A and that of the initial signals
by the dipole D. It is assumed here that the
radio beacon operates, for example, with a wave
of approximately '7 meters and the initial signal
with a Wave of, say, 3 meters. The radio beacon
signals are amplified by a high frequency ampli
fier H and detector GI, the actual circuit details
of which are not of interest here. The initial
nected to windings I and 2 of a transformer in
the grid circuit of the first low frequency tube
NI. Second and third low frequency stages N21 «in
and N3 respectivelyare also provided. The third
low frequency stage N3 is coupled with the sec
ond stage N2 through a ñlter arrangement the
object of which‘is to ensure that only the radio
beacon signals and not the initial signal indi-'
cations are passed to the third low frequency
stage N3. 'I‘he indications from the initial signal
(or radiations) are received with the aid of lamp
L through a transformer 3. The transformer is
tuned by means of the condenser i» and the selff
induction coil 5 to the tone of the initial signal.
A choke circuit 5 which is tuned to the frequency
of the radio beacon is connected in series with
the transformer. In practical operation, an in
dicator note of 1150 cycles was used for the radio
beacon, and 700 or 1700 cycles was used for the
initial signal. Itis of course possible when differ
ent initial signals are used, to tune the trans
former circuit to the different initial signal-notes
by multiple wave or to provide different trans- ,
formers. _The primary winding of the trans
former 'l is tuned with the assistance of the self
induction coil 8 and the condenser 9, to the
beacon note (e. g. 1150) that is to say, it forms for
this frequency a series-resonant circuit. In the 30
secondary circuit of the transformer 'l is pro
vided a choke circuit I0, which is tuned to the
beacon frequency in order to provide a short~
circuit path for the initial signal frequency. The
coupling of the third low frequency stage N3 is
made through a further transformer II. The
transition ratio of the transformers is chosen in
known manner. The self-induction coils of the
series, and choke-circuits are provided with iron
cores, highly alloyed sheet metal of best quality
being used as core material.
The transformer
II has two secondary windings one of which is
connected to the grid circuit of the second low
frequency stage N3, a rectifier I2 being con
nected through the other. The rectifier circuit as 45
shown in the illustration is completed by re
sistances I3 and I4. Parallel to resistance I4 is
connected a condenser I5 of sufficiently high
capacity to obtain a good smoothing. The de
rived direct potential controls the grid potential 50
of the detector valve Gi. As a result the recti
fication effect of the detector valve is varied, the
rectiñcaticn being made more or less efficient in
accordance with the control voltage, that is to
say the volume of sound is controlled.
55
2
2,105,534
It may also be thought that the regulation of
the sound volume might be made in the manner
customary in the wireless art. This process has,
however, the disadvantage that it does not oper
ate entirely satisfactorily on very short waves.
In the case of very short waves, the capacitive
influence of the high frequency valves is so great,
that however great the displacement of the initial
grid voltage, regulation of the sound volume only
10 takes` place to a very limited extent, as the valves
allow the high frequency to pass through capaci
tively and this effect cannot be eliminated, even
by means of extremely high initial grid voltages.
If on the other hand, the regulation is made in
the detector stage of the ultra short wave re
ceiver as above described, then the disadvan
tages mentioned do not occur. The capacitive
transition of the high frequency through the de
tector tube which can of course, occur in exactly
20 the sameway as in the high frequency tube, is of
no importance as the following stages are low
frequency stages, and the high frequency can
therefore have no more influence on the low
frequency.
25
30
Y
separating the amplified signals into two- dif
ferent paths, two signal indicating devices, means
for delivering to one device amplified detected
signals from one receiver and to the other de
10
vice ampliiied detected signals from the other
receiver, a rectifier, means for feeding amplified
detected signal energy from one receiver to said
rectifier, and means for utilizing the direct cur
rent so derived by said rectifier to control the
amplitude of the signal modulated high fre
quency in one of said receivers.
2. A radio receiving arrangement comprising
an ultra short wave receiver for receiving radio
beacon signals, an ultra short wave receiver for
receiving an initial signal, separate detectors for
the receivers, a common amplifying arrangement
for the detected signals from the two receivers,
means for separating the amplified signals, two
J represents an indicator arrangement which
like the receiving arrangement above described
serves for the reception of beacon signals when
installed on air craft for example on airplanes
signal indicating devices, means for delivering to f
or ships.
other of said receivers, a rectifier, means for
‘
In order to apply the broad idea of the inven~
tion any known method of sound volume regu«
lation may be used. It is immaterial if the con~
trol is effected with the aid of a resistance ar
rangement and additional controlling valve.
35
a receiver of radiated signal modulated high fre
quency of one type, a receiver of radiated signal
modulated high frequency of another type, sepa
rate detectors for the receivers, a common ampli
fying arrangement for the detected signals from
the two receivers, frequency selecting means for
What is claimed is:
1. A radio receiving arrangement comprising
one of said devices amplified detected signals
from one of said receivers and to the other of.
said devices, amplified detected signals from the
feeding energy of the detected radio beacon 30
signal to said rectifier and means for utilizing
the direct current so derived by such rectifier
to control the amplitude of the signal impressed
upon the detector of the radio beacon signal
receiver.
HELMUT JOHANNSON.
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