Abstract: A transmitter for modulating an RF carrier signal with an input digital data stream is disclosed. The transmitter has a processor for generating digital phase and digital amplitude signals which characterise the input digital data stream, a signal generator for generating an RF carrier signal with a phase property defined by the generated digital phase signal, an amplifier arranged to receive the RF carrier signal as an input, and a bi-level switching circuit responsive to the generated digital amplitude signal to switch between the two levels to generate a voltage signal for supplying power to the amplifier.

Abstract: An EMI shield for blocking and dissipating electromagnetic interference. The EMI shield includes a primary conductive member having a plurality of catches extending into a plurality of receptacles defined in an absorptive member so as to firmly connect the members. Advantageously, the absorptive member is sufficiently solid to be retained against the primary conductive member during normal use. In addition, the absorptive member is constructed of materials capable of withstanding a temperature range of 139° C. to 260° C. associated with most soldering operations. In this manner, the conductive and absorptive members can be attached prior to soldering of the EMI shield to electronic circuitry of a mobile station. The catches may have sharp edges allowing the absorptive member to be pressed onto the catches.

Abstract: An EMI shield for blocking and dissipating electromagnetic interference. The EMI shield includes a primary conductive member having a plurality of catches extending into a plurality of receptacles defined in an absorptive member so as to firmly connect the members. Advantageously, the absorptive member is sufficiently solid to be retained against the primary conductive member during normal use. In addition, the absorptive member is constructed of materials capable of withstanding a temperature range of 139° C. to 260° C. associated with most soldering operations. In this manner, the conductive and absorptive members can be attached prior to soldering of the EMI shield to electronic circuitry of a mobile station. The catches may have sharp edges allowing the absorptive member to be pressed onto the catches.

Abstract: An EMI shield for blocking and dissipating electromagnetic interference. The EMI shield includes a primary conductive member having a plurality of catches extending into a plurality of receptacles defined in an absorptive member so as to firmly connect the members. Advantageously, the absorptive member is sufficiently solid to be retained against the primary conductive member during normal use. In addition, the absorptive member is constructed of materials capable of withstanding a temperature range of 139° C. to 260° C. associated with most soldering operations. In this manner, the conductive and absorptive members can be attached prior to soldering of the EMI shield to electronic circuitry of a mobile station. The catches may have sharp edges allowing the absorptive member to be pressed onto the catches.

Abstract: A transmitter for modulating an RF carrier signal with an input digital data stream is disclosed. The transmitter has a processor for generating digital phase and digital amplitude signals which characterise the input digital data stream, a signal generator for generating an RF carrier signal with a phase property defined by the generated digital phase signal, an amplifier arranged to receive the RF carrier signal as an input, and a bi-level switching circuit responsive to the generated digital amplitude signal to switch between the two levels to generate a voltage signal for supplying power to the amplifier.

Abstract: A track lighting system is provided including a power track electrically connected to electrical power lines in a building. A plurality of track lighting units are selectively engageable with the power track. Each track lighting unit includes a signal responsive switch that responds to signals transmitted over the power lines of a building. The track lighting system further includes a transmitter that is selectively engageable with the power circuitry to transmit signals to control the operation of the signal responsive switches and the track lighting units to which the switches are operatively connected.