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The 40-749-521 from Pickering Interfaces is a PXI RF Multiplexer with Frequency DC to 1.3GHz, Power 40 dBm, Power 10 W, Current 0.5 A. More details for 40-749-521 can be seen below.
600 MHz RF PXI Multiplexers
SP6T & SP4T PXI Microwave Multiplexer Modules
6 Channel Single/Dual 40 GHz PXI Multiplexer
You can now find similar products from multiple companies on everything RF.