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Check the listing for details. LF-13GHZ RF Digital Step Attenuator (Core Board) Supports Parallel Port Mode. Condition: New. Listed at 72.42 USD. LF-13GHZ 0-31.5DB 9KHz-13GHz RF Digital Step Attenuator (Core Board) Supports Parallel Port Mode. - Core board size: 5cm x 5cm/2" x 2". - Input and output impedance: 50 ohms. - 1 x Core Board. - Input and output interfaces: 26.5G SMA female connectors.