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4398214 |
Wired television broadcasting system
There is disclosed a wired television system comprising a source of television signals supplying signals to a transmission network, subscriber stations connected to the network, means for...
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4396894 |
Digital noise generating apparatus
A digital noise generator, wherein pseudo-random rapidly changing analog input voltages to a voltage controlled oscillator are used to generate corresponding rapidly changing discrete frequency...
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4378602 |
Communication system with a limited communication area
In a communication system including communication transmitting means for modulating a carrier wave having a fixed frequency by a communication signal having communication content and for radiating...
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4357709 |
Apparatus for regenerating signals within a frequency band
Apparatus for generating signals to interfere with or jam signals detected as unfriendly in a given input frequency band comprises a spectrum analyzer circuit using surface acoustic wave (SAW)...
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4342119 |
Multi-tone jammer
A waveform capable of jamming some or all of the channels of a multiple channel receiver is developed by a multi-tone jammer that uses a digital counter and a digital/analog converter to generate a...
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4334322 |
Communication management system for providing antijam/privacy capabilities for voice radio communications
A communications management system includes a central processor (10) which is connected via an order wire subsystem (12) to various remote terminals (14, 16, 18). The central processor (10)...
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4317214 |
Apparatus for simulating interference transmissions
A simulated interference system is provided wherein an interference signal of an interference source is simulated by a narrow band coded control signal that is transmitted from a control...
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4317213 |
Television reception interfering apparatus
Apparatus for use with a television receiver for selectively inhibiting reception of television broadcast signals. The apparatus includes a number of signal generating circuits, each respectively...
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4313207 |
Method and system for selectively disrupting radio telegraph communications
A method and system for disrupting discrete keyed continuous wave radio communications wherein the discrete keyed continuous wave communications signal conveys intelligence by virtue of the...
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4307400 |
Electronic countermeasures system and method of utilizing the same
A method and apparatus for "masking" an aircraft or other vehicle so as to revent it from being located by an enemy radar. The vehicle is provided with means for generating and radiating a CW...
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4247946 |
Smart noise generator
A frequency memory system having a smart noise component is receptive of an RF burst signal of a given frequency and of relatively short duration for determining the frequency and storing a signal...
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4246573 |
Protection system for electronic gear
A system for use in combination with (for electrical attachment to) electronic gear having an audio amplifier and which includes alarm means for generating a theft signal which is broadcast through...
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4222066 |
CATV Subscription service control device and attenuator therefor
A CATV subscription service control device has a switched buffer to prevent jamming signals from a switched attenuator from propagating throughout the system. The attenuator uses mutual inductance...
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4219891 |
Countermeasures system
1. A method for jamming frequency-shift-keyed radio teletype signals which omprises: receiving said frequency-shift keyed signals; converting said signals to teletype current pulses; modification...
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4217550 |
Radio jamming device
1. A jamming device adapted to jam a given frequency band with the exception of a particular jam-free band included in said given frequency band, comprising a transmitter tube generating a...
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4216546 |
Frequency bandwidth tuning system and method
An electronic system for scanning across a range of received signals and aining a digital representation of a predetermined position, for example, the mid-point, of the bandwidth of the received...
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4216545 |
Method and apparatus of communicating emergency signals from a transceiver in a transceiver communication network, particularly for citizen-band emergency use
To alert users of Citizen-Band (CB) radios of an emergency situation, a CB transceiver has a tone generator associated therewith generating an emergency signal, for example a high pitched tone....
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4214208 |
Jamming of keyed continuous wave radio signals
1. A jamming station for radiotelegraph signals comprising, a transmitter, aid transmitter comprising an exciter, the output of said exciter being connected to the input of a power amplifier via a...
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RE29997 |
Signal distribution device for a cable television
A cable television signal distribution system provides a plurality of television programs and radio programs which are transmitted in frequency multiplex to a plurality of subscriber drop lines. A...
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4148064 |
Jamming circuit for television signals
A circuit for transmitting a jamming signal for disruption of a television signal transmitted along a cable or other guided path toward a television receiver, the circuit having a first oscillator...
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4103236 |
Electronic jamming system
1. A method of jamming wireless communications having a frequency falling within a predetermined frequency band, by means of a powerful jamming transmission, comprising the steps of separating out...
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4103237 |
Radio jamming system
1. A repeater comprising an antenna system, a repeater loop consisting solely of broadband elements for coupling the input signal from the input to the output thereof without changing the frequency...
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4063188 |
Injection-locked voltage controlled oscillators
An improved frequency memory system of the type using a voltage controlled oscillator is described. Incoming RF signals are power divided with a first power divided portion applied to a frequency...
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4056788 |
Digital-to-analog noise generator
A noise generator that is responsive to digital noise quality and noise modulation input signals to provide a controller noise signal to a voltage controlled oscillator. The noise generator adds a...
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4017856 |
Self-calibrating microwave transponder
A self-calibrating microwave transponder incorporating an amplifier, modulator, instantaneous frequency discriminator, memory and voltage controlled oscillator is described which may generate an RF...
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3989887 |
Swept frequency trap jammer for secure television system
A jamming circuit for making unusable the television signal of a preselected channel includes a bridged T-trap filter having a pair of high Q circuits adapted to be tuned to the carrier frequency...
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3955200 |
Interleaving jamming technique
1. The method for producing radio-frequency signals for jamming the detecs in twin channel type variable-time proximity fuzes comprising the steps of detecting a first radio-frequency signal...
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3949300 |
Emergency radio frequency warning device
An electronic whistle in the form of broad band radio frequency interference generator. A broad band generator generates a coherent or random noise signal which is modulated by an audio signal...
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3943515 |
Counter-countermeasure guidance system
4. A method of avoiding countermeasure jamming techniques comprising the ps of: Transmitting a signal over at least a pair of carrier waves which differ in frequency by a predetermined amount...
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3942179 |
Filtered-noise jammer
A device for generating spot or barrage noise to jam communication equipment, missiles or radar employing a modulating noise that has the high frequencies removed. Said device comprises a filter...
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3916406 |
Jamming cancellation device
1. In a system for decreasing the effect of interference signals on radar eration, the combination comprising; Interference signal detection means having a long response time to incoming signals,...
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3896262 |
Subscription television jamming system
A system is disclosed for transmitting television signals which can only be intelligibly received by authorized subscribers. At the transmitter end of the system, a CW jamming signal is inserted in...
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3859457 |
SELECTIVE VIDEO RECEPTION INHIBITING APPARATUS
Selective video suppression apparatus, operative on a per-subscriber basis, comprises a band elimination, notch filter tuned to the spectrum of a video signal to be selectively inhibited. The...
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3806925 |
COUNTERMEASURES SYSTEM
1. In an electronic countermeasures system, the combination of an enemy ar designed to aquire or maintain a "lock-on" condition with respect to a target, such radar being designed to receive energy...
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3774208 |
NARROW BAND FREQUENCY MODULATED JAMMER
A narrow band frequency modulated jamming device comprising a noise source, a low-pass filter, an amplifier and a traveling-wave tube capable of being modulated by the application of a signal to...
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3760097 |
ADJACENT CATV CHANNEL JAMMING
A system for allowing the intelligible reception of a selected CATV channel at the subscriber's TV set and for jamming the CATV channels adjacent to the selected channel so that the subscriber...
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3739281 |
SYSTEM FOR JAMMING WIRELESS COMMUNICATIONS
1. In a system for jamming wireless communications with the aid of a searching receiver for ascertaining senders which are engaged in the transmission of messages, a powerful jamming transmitter...
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3720944 |
SIGNAL SYSTEM FOR JAMMING DETECTION SYSTEMS UTILIZING SIGNAL CORRELATION
The invention provides for a method and apparatus for jamming detection systems employing signal correlation devices, wherein a jamming signal may be transmitted. The transmitted signal, which is...
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3710313 |
EMERGENCY WARNING SYSTEMS
Communications warning apparatus of the type wherein a transmitter is mounted in an emergency vehicle and one or more frequency-adaptive receivers are mounted in other vehicles. This system...
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3710256 |
MICROWAVE FREQUENCY MEMORY DEVICE
A frequency memory device wherein the cycle by cycle waveform of a short pulse of microwave energy is recorded electro-optically. This recording is then read or played back over and over again...
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3660811 |
PROXIMITY WARNING TRANSMITTER FOR EMERGENCY VEHICLES
A transmitter, carried by an emergency vehicle, transmits directional jamming radiation to operating receivers of passenger vehicles in its path. Different fixed frequency audio signals alternately...
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3638123 |
VLF ATMOSPHERIC NOISE SYNTHESIZER
The output of a random noise generator is applied to a negative image clir whose clipped output is simultaneously applied to at least three separate channels, each channel having in tandem...
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3600685 |
APPARATUS AND METHOD FOR INTERFERING WITH RADIO COMMUNICATIONS
Interfering with the radio communication between a transmitter and one or more receivers using the communication itself to destroy the intelligibility of the communication to the intended...
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3517388 |
COMMON SOURCE MODULATION OF MULTIPLE COUNTERMEASURES TRANSMITTERS
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3508264 |
MEANS FOR AVOIDING SEA RETURN
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3473126 |
SIGNAL JAMMING DEVICE COMPRISING A SINGLE NOISE GENERATOR
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3431496 |
JAMMING TRANSCEIVER WITH AUTOMATIC FREQUENCY TRACKING OF JAMMED SIGNAL
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3426475 |
TOY GUN HAVING ELECTROMAGNETIC RADIATION MEANS
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3225300 |
Automatic noise jamming multicarrier f.m. system
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3092771 |
Broadband transmit-receive device
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