摘要:
A communications radio has an IF stage with an associated filter array. The array includes at least one narrowband filter whose passband is less than 3 MHz, at least one wideband filter whose passband is 3 MHz or greater, a first switch with a common pole connected to an input terminal of the array, a second switch with a common pole connected to an output terminal of the array, a third switch whose common pole is operatively connected to the input terminal, and a fourth switch whose common pole is operatively connected to the output terminal. The first and the second switches cooperate to insert a selected filter between the first and second terminals. The third and the fourth switches cooperate to insert the filter array into either a receive signal path when the radio is in a receive mode, or a transmit signal path when in a transmit mode.
摘要:
A compact radio core engine (CE) module uniquely small in size and power consumption, in which only two circuit boards provide all the modem and transceiver functions needed for modern military radios. A modem circuit board has modem devices and a first connector mounted on the board, and a radio frequency (RF) circuit board has RF devices and a second connector mounted on the board. A module frame has an interior wall, and a side wall about the periphery of the interior wall. The modem and the RF circuit boards are positioned on opposite sides of the interior wall, and the connectors on the two boards mate with one another through an opening in the interior wall to exchange operating data and signals between the devices on the boards. The modem circuit board is seated entirely within a recess formed by the interior and the side walls of the frame.
摘要:
A filter package for communications equipment includes two or more filters in die form, each having a different frequency response. A first switch and a second switch are operatively connected to the filters and are configured to select a desired filter for operation in a signal stage of the equipment. The filters are aligned and stacked one over the other in the form of a package having an input terminal that is tied to a common terminal of the first switch, and an output terminal tied to a common terminal of the second switch. When the input and the output terminals of the filter package are connected to corresponding terminals of an intermediate frequency (IF) stage in a communications transceiver, the package can support both narrowband and wideband waveforms defined by the Joint Tactical Radio System (JTRS).
摘要:
A method of controlling the phases of RF output signals from a number of radio transmitters. A given radio has at least one synthesizer as a source of its RF output signal, and the synthesizer produces an output the phase offset of which relative to a reference signal is controlled by a phase offset command. A path from an antenna port of the radio obtains a fed back RF output signal and a phase difference between the reference signal and the fed back RF output signal is measured. A value of a zero degree phase offset command for the synthesizer is determined such that the phase difference between the reference signal and the fed back RF signal is nominally zero, and the value is stored. A phase offset command for providing a desired phase offset for the RF output signal is then determined based the stored value of the zero degree phase offset command.