From the Rockwell Collins website…
Rockwell Collins Filter Products specializes in designing mechanical filters to meet your unique and evolving requirements. We produce two different types of mechanical filters. For frequencies between 100 kHz and 700 kHz, we create filters made from rods resonating in a torsion mode. For frequencies below 100 kHz, we use flexure mode bar resonators. Our filters can achieve bandwidths from 0.05 to 5 percent.
Over the past several years, we have seen a dramatic reduction in demand for narrowband analog filters. Due to this and other economic reasons, Filter Products will be discontinuing its mechanical filter products in the near future.
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