초록 ▼

A jammer includes means for receiving a local radio transmission and means for determining the frequency of the local radio transmission. Monitoring circuits are arranged to detect the end of the local radio transmission and only then to trigger the transmission of a jamming signal by jamming signal

A jammer includes means for receiving a local radio transmission and means for determining the frequency of the local radio transmission. Monitoring circuits are arranged to detect the end of the local radio transmission and only then to trigger the transmission of a jamming signal by jamming signal transmitting means. In this manner the jammer jams local reception of the response of a non-local station to the detected local transmission. The jammer is able to jam effectively using a low power signal. The reduction in the power-consumption of the jammer makes it particularly suitable for use as a leave-behind jammer for military applications.

대표청구항 ▼

An apparatus for jamming communication between a local station and a distant station comprising: receiving means for receiving a message from a local radio transmission, means including monitoring means for detecting the end of said local radio transmission message, frequency determining means opera

An apparatus for jamming communication between a local station and a distant station comprising: receiving means for receiving a message from a local radio transmission, means including monitoring means for detecting the end of said local radio transmission message, frequency determining means operatively connected to said receiving means for determining a frequency of said local radio transmission received by said receiving means, jamming signal transmitting means operatively connected to said frequency determining means for transmitting a jamming signal at a frequency controlled in accordance with said frequency determined by said frequency determining means at a time subsequent to reception of said local radio transmission by said receiving means, and means responsive to detection by said monitoring means of the end of said local radio transmission message for initiating operation of said jamming signal transmitting means only after said end of said local radio transmission message and for a predetermined period of time after said end of said local radio transmission message for jamming local reception of a response from said distant station for said predetermined period of time.