US1754326A - Arrangement for wireless telegraphy and telephony - Google Patents

Description

April 15', 1930. A. LEIB 1,754,326

ARRANGEMENT FOR WIRELESS TELEGRAPHY AND TELEPHONY Filed March 26 1925 5 75 Canaer rserZ 7 I r F 51414044 60: AUGUST LEIB Patented -Apr. 15, 1930 RnssUEb UNITED STATES PATENT OFFICE A'UGUS'I. LEIB, BEBLIN, GERMANY, ASSIG'NOB T GESELLSCHAFT FIIR DRAHTLOSE TELEGRAPHIE M. B. 11., 0F BERLIN, GERMANY, A'CORPORATION OF GER-MANY ARRANGEMENT FOR WIRELESS TELEGRAPHY AND TELEPHONY Application filed March 26, 1923, Serial No. 627,828, and. in Germany July 4, 1922.

The present invention relates to an arrangement for wireless telegraphy and telephony and is particularly intended for use 1n recelvchronism' with the varying tuning means, 1s employed to render the indicator such as a detector, an amplifier, a telephone, etc., ineffective for certain points or parts of a wave band. Due to this arrangement at certain selectable points of the band of wave lengths to which the receiver may be tuned by the tuning means, receiving is made impossible, and therefore these bands or ranges may be barred from, e. g., unauthorized radio receiving. This may be attained by a switch device which is mechanically connected with the variable condenser or variometer ofa tuned circuit of the receiver. telephone receiver cuited so as to prevent reception.

The parts not shown in Fig. 2 are similar to those of Fig. 1 and the connections likewise y,

. 4 3. 'In a high frequency receiving system,

similar.

I As shown, a disc 1 having a toothed periphery is fixed on the shaft of the variable condenser 2 of an oscillating circuit in a receiver. This disc cooperates with a contact device 3 and causes the opening and closing of this contact when during the rotation of the disc the contact engages depressed and raised portions respectively of its toothed periphery.

The tuned circuit is completed by the self in- 1 duction 4, and its tuning will continuously pass through the wave band of the receiver while the condenser 2 is being rotated, An indicator such, for example as an audion 5 with a telephone receiver 6 is connected with the oscillating circuit of the receiver. The contact device 3 is in the conductor leading from the tuned circuit to the audion and will interrupt this connection while the movable member of contact device 3 rests in a notch of the disc 1. For thisreason, receiving is prevented over a corresponding portion of the wave band. Obviously, the interruption By this device the detector, the I or the amplifier circuits 20 may be temporarily disconnected or short cirf may be eifected in another part of the circuit arrangement of the receiver e. g. in the anode circuit of the tube, the heating circuit, etc. ers in which a device, which operates 1n syn- The arrangement shownin Figure 2 is sim ilar to the arrangement shown in Figiurel except that in Figure 2 the anode circuit is interrupted by the contact device 1. and 3. v

The invention is particularly-intended. for use inreceiving apparatus in-which the condenser 2 is continuously. operated to repeatedly vary the tuning of the receiver over a band of wave lengths; f-

Having described my=invention,,what I claim'isz- 1. In a high frequency receivinggsystem, a resonant circuit,"means=fo.r varying..the tuning ofthe circuit, a' second, circuit, and

means-c operated by said tuning varying means'forbreaking said second circuit to prevent reception at certain wavelengths.

(2? In a high frequency receiving ,system,

receiving means, a signal responsive device,

,a'r'id-'m"eans for continually and periodically placing said signal responsive .ydevice into and out ofoperatlve -'relat1on with. said receiving means at predetermined separated values of the. incoming signal wave Elengths.

a resonance circuit, means for continuously and periodically varying the tuning of said circuit through a band of wave lengths, and means for preventing reception at predetermined separated wavelengths of the band.

4. In a high frequency receiving system, a resonance circuit, means for continuously and repeatedly varying the tuning of said circuit through a band of wave lengths, and

means operated by said first means for preventing reception at predetermined separated Wave-lengths of the band to which said receiving system is responsive.

5. In a high frequency receiving system, a resonance circuit, means for continuously and repeatedly varying the tuning of the circuit, and means operated by said tuning varying means for preventing reception at certain predetermined separatedwave lengths in the signal band to which said rece1v1ngsystem is responsive.

6. In a high frequency receiving system,

a resonance circuit, means for continuously and repeatedly varying the tuning of the circuit, a second circuit, and means operated by said tuning varying means for continuously and repeatedly breaking said second circuit to prevent reception at certain wavelengths.

7. In a high frequency receiving system, a circuit having a tuning device therein, a signal responsive device, circuit breaking means for controlling said signal responsive device, and rotatingmeans for operating said tuning device and said circuit breaking means simultaneously continuously and repeatedly.

8. In a high frequency receiving system, a resonance circuit having a tuning device therein, an audion tube having input and output circuits, said input circuit being coupled to said resonance circuit, a circuit interrupter having contacts in one of said tube circuits, rotating means for controlling said tunning device and said circuit interrupter simultaneously, and a telephone in said output circuit.

N 9. In a high frequency receiving system, a resonance circuit including a condenser, means for controlling said condenser to vary the resonant frequency of said circuit, a second circuit, and means operated by said condenser-controlling means for making and breaking said second circuit to prevent reception at certain Wavelengths.

10. In a receiving arrangement for wireless telegraphy and telephony, a resonant cir= cuit, a continuously rotated condenser for continuously and repeatedly varying the tuning of the circuit through a band of wave lengths, a disc mounted on the shaft of the condenser and having a toothed periphery, and contacts controlled by said disc for breaking a circuit of the arrangement so as to prevent reception at certain of the wave lengths in said band.

AUGUST LEIB.

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