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.