Abstract: A programmable uninterruptible power supply for coupling battery powered systems associated with a mobile site, such as a vehicle, to the primary electrical system of the mobile site operates to selectively couple the battery powered systems to the electrical system of the mobile site and to a secondary, or back-up battery separate from the primary battery associated with the electrical system of the mobile site. Various system control functions are performed, including reverse battery protection, over voltage and under voltage protection, battery drain protection, battery charging detection, reverse current detection and uninterruptible power switching. For detected adverse operating conditions, the load is disconnected from the electrical system of the mobile site and the back-up battery is used to operate the battery powered systems which are to be protected from such adverse operating conditions.

Abstract: A programmable uninterruptible power supply for coupling battery powered systems associated with a mobile site, such as a vehicle, to the primary electrical system of the mobile site operates to selectively couple the battery powered systems to the electrical system of the mobile site and to a secondary, or back-up battery separate from the primary battery associated with the electrical system of the mobile site. Various system control functions are performed, including reverse battery protection, over voltage and under voltage protection, battery drain protection, battery charging detection, reverse current detection and uninterruptible power switching.

Abstract: A wideband signal distribution unit for receiving a plurality of inputs and having a plurality of outputs is provided. The distribution unit features a first combiner having an output and being connected to a first subset of the plurality of inputs. A second combiner having an output is connected to a second subset of the plurality of inputs. A phase shifting combiner having inputs each connected to the outputs of the first and second combiners supplies a combined signal to an output connected to a splitter which is connected to the plurality of signal distribution unit outputs. The phase shifting combiner is designed to apply a phase shift to one of its inputs.