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The 490-330490-002 from M2 Global Technology is a Waveguide to Coax Adapter with Frequency 3.30 to 4.90 GHz, Insertion Loss 0.3 dB. More details for 490-330490-002 can be seen below.
1.85mm, 2.4mm and 2.92mm Waveguide to Coax Adapters Operating Up to 65GHz
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