The 431-123P-52S from Amphenol RF is a RF Connector with Frequency DC to 26.5 GHz, Operating Temperature -65 to 165 Degree C, PIM -166 dBc, Return Loss 32 to 36 dB, VSWR 1.05:1, 1.50:1. Tags: Standard. More details for 431-123P-52S can be seen below.