Abstract: An exercise machine with a more natural gait and computer gaming interface which, in some embodiments, further allows for a variable stride length while in use. In one configuration, each side of the exercise machine has a first crank assembly connected at an upper location on a pedal arm and a second crank connected at a middle location on the pedal arm, and a pedal is attached to a lower location of the pedal arm. The first crank assembly is connected to the pedal arm by a crank arm. The second crank assembly is connected to the pedal arm via a crank arm pivotally attached to a crank link. The path of each pedal is determined by the lengths of crank arms and crank links of the first and second crank assemblies rotating in synchronous motion.

Abstract: The present disclosure includes an embodiment of a miniaturized antenna system and methods for compact multi-band transmission and reception of radio signals in a high-frequency (HF) band. An embodiment of the antenna system may include a plurality of shortwave antennas arranged in an antenna cluster, one or more controllers, and one or more monitors. The embodiment of the antenna system may allow the antenna cluster to operate effectively without a plurality of switches over a plurality of HF band frequencies. An embodiment of the one or more controllers may include a frequency testing and acknowledgement circuit that may determine and confirm which frequencies are propagating.

Abstract: The described disclosure presents embodiments of an efficient shortwave radio technique using a network of multiple sites located in and around an operating region (e.g., continental USA), calibrated distributed beacons, a detailed knowledge of ionospheric behavior, and sophisticated operational tools and software, that geo-locates targets without depending on satellites. The embodiments of the technique described herein, for example, accurately may locate a target by utilizing remote field units, a network of radio receive sites, receivers that accept and time stamp pertinent signals, demodulators that recognize and extract meaningful data from received signals, communications from all receive sites to a Network Operations Center (NOC), communications from NOC to field units to keep shortwave channel choices relevant and effective, and a processor within the NOC that analyzes and evaluates data.

Abstract: The present disclosure includes an embodiment of a miniaturized antenna system and methods for compact multi-band transmission and reception of radio signals in a high-frequency (HF) band. An embodiment of the antenna system may include a plurality of shortwave antennas arranged in an antenna cluster, one or more controllers, and one or more monitors. The embodiment of the antenna system may allow the antenna cluster to operate effectively without a plurality of switches over a plurality of HF band frequencies. An embodiment of the one or more controllers may include a frequency testing and acknowledgement circuit that may determine and confirm which frequencies are propagating.

Abstract: The present disclosure includes embodiments of a two-way wireless data communication system and associated methods. An embodiment of a system can include a network operations center (NOC), a plurality of fixed-location receive base stations (RBS) in communications with the NOC, and an intelligent shortwave communication network in communications with the NOC and the plurality of RBS and including a plurality of remote intelligent transceiver units (ITU). In an embodiment, for example, the NOC can be operative to a) compute rapidly a protocol under which nationwide communications is to be completed via coordinated operations of the linked ITU and RBS, b) determine propagating and clear electromagnetic wavelengths over an entire 3 MHz to 30 MHz shortwave band, and c) send a continuous stream of data indicating times and frequencies at which remote units can rapidly and efficiently transmit data and at which antenna sites can reliably and efficiently receive that data.

Abstract: The described disclosure presents embodiments of an efficient shortwave radio technique using a network of multiple sites located in and around an operating region (e.g., continental USA), calibrated distributed beacons, a detailed knowledge of ionospheric behavior, and sophisticated operational tools and software, that geo-locates targets without depending on satellites. The embodiments of the technique described herein, for example, accurately may locate a target by utilizing remote field units, a network of radio receive sites, receivers that accept and time stamp pertinent signals, demodulators that recognize and extract meaningful data from received signals, communications from all receive sites to a Network Operations Center (NOC), communications from NOC to field units to keep shortwave channel choices relevant and effective, and a processor within the NOC that analyzes and evaluates data.

Abstract: The present disclosure includes embodiments of a two-way wireless data communication system and associated methods. An embodiment of a system can include a network operations center (NOC), a plurality of fixed-location receive base stations (RBS) in communications with the NOC, and an intelligent shortwave communication network in communications with the NOC and the plurality of RBS and including a plurality of remote intelligent transceiver units (ITU). In an embodiment, for example, the NOC can be operative to a) compute rapidly a protocol under which nationwide communications is to be completed via coordinated operations of the linked ITU and RBS, b) determine propagating and clear electromagnetic wavelengths over an entire 3 MHz to 30 MHz shortwave band, and c) send a continuous stream of data indicating times and frequencies at which remote units can rapidly and efficiently transmit data and at which antenna sites can reliably and efficiently receive that data.

Abstract: The present disclosure includes embodiments of a two-way wireless data communication system and associated methods. An embodiment of a system can include a network operations center (NOC), a plurality of fixed-location receive base stations (RBS) in communications with the NOC, and an intelligent shortwave communication network in communications with the NOC and the plurality of RBS and including a plurality of remote intelligent transceiver units (ITU). In an embodiment, for example, the NOC can be operative to a) compute rapidly a protocol under which nationwide communications is to be completed via coordinated operations of the linked ITU and RBS, b) determine propagating and clear electromagnetic wavelengths over an entire 3 MHz to 30 MHz shortwave band, and c) send a continuous stream of data indicating times and frequencies at which remote units can rapidly and efficiently transmit data and at which antenna sites can reliably and efficiently receive that data.

Abstract: The present disclosure includes embodiments of a two-way wireless data communication system and associated methods. An embodiment of a system can include a network operations center (NOC), a plurality of fixed-location receive base stations (RBS) in communications with the NOC, and an intelligent shortwave communication network in communications with the NOC and the plurality of RBS and including a plurality of remote intelligent transceiver units (ITU). In an embodiment, for example, the NOC can be operative to a) compute rapidly a protocol under which nationwide communications is to be completed via coordinated operations of the linked ITU and RBS, b) determine propagating and clear electromagnetic wavelengths over an entire 3 MHz to 30 MHz shortwave band, and c) send a continuous stream of data indicating times and frequencies at which remote units can rapidly and efficiently transmit data and at which antenna sites can reliably and efficiently receive that data.