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The 618 from Narda Microwave is a Waveguide to Coax Adapter with Frequency 2.6 to 3.95 GHz, Power 200 W, Peak Power 3 KW, Weight 0.8 Kg. More details for 618 can be seen below.
1.85mm, 2.4mm and 2.92mm Waveguide to Coax Adapters Operating Up to 65GHz
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