The 40-877 is a 50Ohm 2x2 RF matrix available with 1 or 2 banks in a single PXI slot. Loop-thru connections are provided on both the X and Y axis allowing the attachment of terminations for unused signals or for expansion to other matrices. Larger matrices are easily built with varied X and Y dimensions, such as 8x2 and 4x4 using multiple 40-877 modules. All versions exhibit low insertion loss and VSWR through the use of modern RF relay technology at an affordable cost. Each matrix has been carefully designed to ensure excellent and repeatable RF characteristics to frequencies of 2.5GHz. The injection of noise and unwanted signals into the signal paths of the 40-877 has been minimized by careful attention to the mechanical and electrical design.