range of compact multi-resonator milled aluminum bandpass filters is ideal for use where space is restricted or at a premium and where a 19inch rack mounting facility is available. The symmetrically sharp skirt response and low passband insertion loss make these filters ideal for use as pre-selectors in receiver systems or as post filters cleaning up low power transmitter carriers or Tx sub-bands. Internal DC grounding in the input/output ports provide natural voltage surge protection. The temperature stable resonators provide a wide operational temperature range ensuring important electrical specifications are maintained in extreme temperature conditions.