Abstract: A method of communicating between a rotary wing platform and a ground terminal via a satellite. The method comprises, at the rotary wing platform, receiving a forward link signal transmitted by the satellite; on the basis of the received forward link signal, estimating at least one obstruction characteristic associated with obstruction of a signal transmission path between the rotary wing platform and the satellite by one or more blades of the rotary wing platform; determining a plurality of time periods during which the at least one obstruction characteristic indicates that the signal transmission path will not be obstructed by the one or more blades of the rotary wing platform; and transmitting to the satellite a bursted carrier return link signal comprising a plurality of bursts, wherein each burst in the plurality of bursts is transmitted during one of the determined time periods.

Abstract: A circulator for radio frequency is provided. The circulator may include a ferrite stripline assembly, which includes a first ferrite layer, a second ferrite layer over the first ferrite layer, and a junction circuit between the first ferrite layer and the second ferrite layer. The circulator may also include a magnet over the second ferrite layer for providing magnetic bias.

Abstract: A method of communicating between a rotary wing platform and a ground terminal via a satellite. The method comprises, at the rotary wing platform, receiving a forward link signal transmitted by the satellite; on the basis of the received forward link signal, estimating at least one obstruction characteristic associated with obstruction of a signal transmission path between the rotary wing platform and the satellite by one or more blades of the rotary wing platform; determining a plurality of time periods during which the at least one obstruction characteristic indicates that the signal transmission path will not be obstructed by the one or more blades of the rotary wing platform; and transmitting to the satellite a bursted carrier return link signal comprising a plurality of bursts, wherein each burst in the plurality of bursts is transmitted during one of the determined time periods.

Abstract: Various improvements and configurations for magnetic musical instrument pickups. Many of the embodiments discussed herein include printed circuit board (pcb) coils, but other embodiments may involve conventional wire wound coils. In some embodiments, the coils (pcb and/or wire wound) are encased in rigid encasement material (see DEFINITIONS section) to reduce microphony and make a quieter pickup. Also, the use of pcb coils allows for many and various new coil shapes and/or configurations because the footprint and stacking of pcb traces are relatively easy to control and/or change. Also disclosed are electromagnetic field interference reduction techniques and integration of multiple coils directly into a single pcb substrate and/or scratchpate. Also disclosed is the use of Hallbach biasing magnet arrays in connection with wire wound and/or pcb coils.