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The 284-258A-6 from L-3 Narda-ATM is a Waveguide to Coax Adapter with Frequency 2.60 to 3.95 GHz, Power 975 W, Peak Power 3 KW, Insertion Loss 0.14 dB. More details for 284-258A-6 can be seen below.
1.85mm, 2.4mm and 2.92mm Waveguide to Coax Adapters Operating Up to 65GHz
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