Abstract: Systems and methods for operating a communication device. The methods comprise: monitoring, by the processor, states of snap-dome based switches of a keypad provided with the communication device; activating, by the processor, a first timer when the snap-dome based switches are simultaneously activated; detecting, by the processor, when maintenance of the communication device is needed based on a value of the first timer; and causing, by the processor, performance of communication device maintenance based on the detecting, for immersion time and immersion depth fatigue.

Abstract: A method for compressing a short message includes receiving a short message that includes a plurality of text strings for compression, dividing the short message into one or more sub-blocks, where a number of text strings in each of the one or more sub-blocks is less than or equal to a predetermined number. The method also includes compressing each of the one or more sub-blocks by identifying a type of a first text string, identifying a code representing the type, determining whether the first text string exists in a library, upon determining that the first text string exists in the library, determining an index corresponding to the first text string, extracting a predetermined number of least significant digits of the index, and replacing the first text string in that sub-block with the code and the extracted predetermined number of least significant digits of the index.

Abstract: Broadband HF antenna system includes a conductive radiating element in the form of a continuous conductive loop. The conductive loop includes first and second elongated conductor portions. The conductive loop is electrically connected at first and second loop ends to an impedance matching network disposed within a chassis. The first elongated conductor portion is comprised of a whip antenna which functions as a cantilevered spring attached at one end to the rigid chassis. The whip antenna is resiliently maintained in a curved state by a tension force applied by the second elongated conductor portion. A spacing or gap between the first and second elongated conductor portions to establish the loop configuration is maintained exclusive of any spacer or hanger element.

Abstract: Systems and methods for operating a network. The methods comprise: determining, by a first network node, a capacity of each communications link of a plurality of communications links on which the first network node is able to receive data from second network nodes; determining, by the first network node, a total number of network nodes that share the capacity of each said communications link of the plurality of communications links; computing, by the first network node, first data transmission rates for the plurality of communications links using the capacities and the total numbers of network nodes, respectively; comparing, by the first network node, the first data transmission rates to each other to determine which data transmission rate has a lowest value; and/or performing communication operations by the first network node in accordance with the data transmission rate determined to have the lowest value of the first data transmission rates.

Abstract: Limiting frequency overshoot in a timing recovery loop involves using a proportional-integral (PI) control system to discipline a frequency of an output signal of a voltage controlled oscillator (VCO) in accordance with a time reference signal. A control signal output of the PI control system is monitored to detect conditions which will prospectively cause an excess deviation of the VCO frequency. In response to detecting such a condition, an output of an integral error term generator of the PI control system is locked or held constant. This will have the effect of preventing the excess frequency deviation of the VCO.

Abstract: Determining a signal emitter location involves receiving a signal of interest (SOI) at detection devices, generating a time stamp corresponding to the arrival of the SOI at each detection device, and communicating digital data samples and the time stamp to a time-difference of arrival (TDOA) computer system. The TDOA computer system determines a TDOA of the SOI at the detection devices relative to an arrival time at a first one of the detection devices having an earliest time stamp. It determines a first solution to identify the emitter location in accordance with a first TDOA solution method. It evaluates the reliability of the first solution and selectively uses a second solution if the first solution is insufficiently reliable.

Abstract: Breakaway retention device (100) is comprises a retained member (120) and a retention body (110). The retention member includes a retention knob (121). The retention body includes a housing having one or more resilient components (113a and 113b), two or more retention members (114a, 114b, 114a, and 114d), and a retention space (118). The retention space is at least partially defined by the retention members and configured to receive the retention knob when the retained member and the retention body are coupled together. The resilient components are disposed to resiliently maintain each of the retention members in a predetermined engagement position in the retention body to engage the retention knob when the retained member and the retention body are coupled together. The retained member and the retention body are prevented from being decoupled without the application of a predetermined force.

Abstract: A method for compressing a short message includes receiving a short message that includes a plurality of text strings for compression, dividing the short message into one or more sub-blocks, where a number of text strings in each of the one or more sub-blocks is less than or equal to a predetermined number. The method also includes compressing each of the one or more sub-blocks by identifying a type of a first text string, identifying a code representing the type, determining whether the first text string exists in a library, upon determining that the first text string exists in the library, determining an index corresponding to the first text string, extracting a predetermined number of least significant digits of the index, and replacing the first text string in that sub-block with the code and the extracted predetermined number of least significant digits of the index.

Abstract: Systems (400) and methods for reducing a number of cyclostationary features in a transmitted signal. The methods comprise: obtaining by a transmitter a discrete-time IF signal comprising a sequence of samples all having a same sample duration; performing operations by a sub-sample dithering processing device of the transmitter to modify a sample timing of the discrete-time IF signal by decreasing or increasing a duration of at least one first sample of the sequence using a digital signal processing technique in a digital domain; converting the discrete-time IF signal to an RF signal; and transmitting the RF signal having a reduced number of cyclo stationary features.

Abstract: A wireless communications device may include an RF transmitter having an operating frequency range, an RF antenna having an electrical length less than or equal to one-tenth of a wavelength of a lowest operating frequency of the operating frequency range, and an RF matching network coupled between the RF transmitter and the RF antenna. The RF matching network may include a first RF matching transformer, a first inductor coupled between a first reference terminal and a reference voltage, a first resistor coupled across a first output terminal and the first reference terminal and configured to dissipate heat that would otherwise be dissipated by the first RF matching transformer to reduce an operating temperature of the first RF matching transformer, and a heat sink coupled to the first resistor.

Abstract: A wireless communications device may include an RF transceiver. The RF transceiver may have a first connector, an RF transceiver circuit coupled to the first connector, and a probe circuit coupled to the first connector and configured to place a DC supply voltage on the first connector. The wireless communications device may include an RF antenna assembly to be coupled with the RF transceiver. The RF antenna assembly may have a second connector configured to be mated with the first connector, an RF antenna element coupled to the second connector, and an antenna ID circuit coupled to the second connector and configured to be powered from the DC supply voltage and modulate the DC supply current indicative of an ID of the RF antenna element. The probe circuit may be configured to determine the ID of the RF antenna element based upon the modulated DC supply current.

Abstract: Systems (400) and methods for removing dither introduced into a transmitted RF signal. The method comprising: receiving, by a receiver, the transmitted RF signal; converting, by the receiver, the transmitted RF signal into a discrete-time IF signal comprising a sequence of samples, where at least a first sample of said samples has a first sample duration different than a second sample duration of at least a second sample of said samples; and performing operations by a sub-sample dither removal device of the receiver to modify a sample timing of the discrete-time IF signal by decreasing or increasing the first sample duration of the first sample using a digital signal processing technique in a digital domain.

Abstract: An electronic device may include a circuit board, an IC carried by the circuit board, and an RF shield above the IC. The circuit board may include a dielectric layer, and a thermally conductive body in the dielectric layer. The thermally conductive body may have a first heat transfer surface coupled to the IC. The thermally conductive body may extend laterally within the dielectric layer and outward past the RF shield and defining a second heat transfer surface. The electronic device may include a heat sink coupled to the second heat transfer surface.