Патент USA US2105534код для вставки
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.