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The 187-255A-6 from L-3 Narda-ATM is a Waveguide to Coax Adapter with Frequency 3.95 to 5.85 GHz, Power 200 W, Peak Power 3 KW, Insertion Loss 0.16 dB. More details for 187-255A-6 can be seen below.
1.85mm, 2.4mm and 2.92mm Waveguide to Coax Adapters Operating Up to 65GHz
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