Abstract: Methods and systems for identifying a signal-of-interest in an over-the-air signal that includes a self-interfering signal. The over-the-air signal and the transmitted signal are sampled and passed to an adaptive filter. The adaptive filter processes a plurality of samples in parallel. The samples are subbanded by passing through an analysis filter, downsampled, and then used to update the adaptive filter coefficients. The updated filter coefficients may be updated based on a variable step-size that decreases as the system converges or a fixed step-size.

Abstract: A manifold combiner for a plurality of radio frequency electromagnetic signals includes a first RF bandpass filter element with input and output ports and a first junction element, wherein the first junction element includes a first port connected to the first filter output port, a second port connected to a shorted stub element, and a third port functioning as an output. The signal path toward the stub appears as an open to the first filter. The combiner further includes at least one additional filter element and junction element, with the second port of the additional junction element fed from the output of the previous junction element. Interconnecting sections couple the respective elements. Dimensions of interconnecting sections are selected such that each filter element output sees a single path out of the manifold, through the output of the last junction element, with all other possible paths appearing as open circuits.

Abstract: A manifold combiner for a plurality of radio frequency electromagnetic signals includes a first RF bandpass filter element with input and output ports and a first junction element, wherein the first junction element includes a first port connected to the first filter output port, a second port connected to a shorted stub element, and a third port functioning as an output. The signal path toward the stub appears as an open to the first filter. The combiner further includes at least one additional filter element and junction element, with the second port of the additional junction element fed from the output of the previous junction element. Interconnecting sections couple the respective elements. Dimensions of interconnecting sections are selected such that each filter element output sees a single path out of the manifold, through the output of the last junction element, with all other possible paths appearing as open circuits.

Abstract: An outer conductor connector for helically convoluted coaxial transmission lines is provided that bonds and seals an adapter to the coaxial line, preferably using solder, then attaches an O-ring sealed outer fitting that terminates in a standard flange. The outer conductor connector adapts a helically convoluted coax to a second O-ring seal in order to support dry nitrogen cable fill. Assembly with ordinary shop tools is facilitated. Center and outer conductors may be cut to the same length, wherein cut length is noncritical. The outer conductor connector includes an adapter that allows the use of a broad range of inner conductor connectors for nonconvoluted center conductor.