Abstract: A method to perform an in-situ analysis of a downhole communication system includes generating a transmission waveform of a transmission signal, and amplifying the transmission waveform by a digital to analog converter and an amplifier that are configured to modify a property of the transmission waveform. After generating the transmission waveform, the method includes transmitting the transmission waveform to a tool of a communication system. The method further includes filtering a response waveform from the tool, the response waveform being a waveform of a signal transmitted by the tool in response to receiving the transmission waveform. The method further includes performing an in-situ analysis of the tool based on the response waveform.

Abstract: Some implementations may include a subassembly configured for attachment to a tubular in a borehole. The subassembly may include a tuning module configured to tune a first antenna to a first frequency based on a design requirement of the first antenna or a desired distance between the first antenna and a second antenna. The subassembly also may include the first antenna configured to transmit or receive a signal at the first frequency to or from the second antenna.

Abstract: Embodiments of a method, system, and apparatus for using non-collinear and non-orthogonal sensors to measure downhole tool dynamics are disclosed. In one embodiment, a method includes receiving data from a first sensor mounted on a chassis of a downhole tool; receiving data from a second sensor, wherein the second sensor is mounted on the chassis and is positioned non-collinear relative to the first sensor; mathematically transforming the received data from the first and second sensor such that the transformed data represents the first sensor and the second sensor as if positioned orthogonal relative to each other; and determining motion data in a wellbore from the transformed data.

Abstract: A method to perform an in-situ analysis of a downhole communication system includes generating a transmission waveform of a transmission signal, and amplifying the transmission waveform by a digital to analog converter and an amplifier that are configured to modify a property of the transmission waveform. After generating the transmission waveform, the method includes transmitting the transmission waveform to a tool of a communication system. The method further includes filtering a response waveform from the tool, the response waveform being a waveform of a signal transmitted by the tool in response to receiving the transmission waveform. The method further includes performing an in-situ analysis of the tool based on the response waveform.

Abstract: The disclosed embodiments include multi-channel communications filters, multi-channel communications systems, apparatuses that utilize a tunable multi-channel communications filter for antenna tuning, and methods to perform multi-channel communications filter tuning. A multi-channel communications filter includes a coupled inductor having a primary winding that is coupled to a power source, and magnetically coupled to one or more secondary windings. The multi-channel communications filter also includes a tuning bank formed from a first set of capacitors; and a first set of switches that are configured to adjust capacitance of the first set of capacitors to impede signals having a first frequency range from flowing through the multi-channel communications filter. The tuning bank and the first set of switches are coupled to the one or more secondary windings.

Abstract: Systems for synchronizing downhole subs are disclosed. Some system embodiments may include a first downhole sub including a clock signal generator configured to generate an unmodified clock signal. The first downhole sub may also include a modification circuit configured to modify the clock signal. The system may also include a second downhole sub comprising a phase-locked loop circuit configured to receive as input the modified clock signal and output a second clock signal synchronous with the unmodified clock signal.