I'm trying to determine a SMA to IPEX adapter impedance using a LCR meter following SQRT(L/C) . I'm a hobbiest, and do not have access to expensive impedance measuring equipment. I've had success with this on standard size coax cables but the not with the smaller IPEX to SMA cables, like in the picture below. I've tested 3 different "Chinese" brands which are supposed to be 50ohm but I'm receiving values in the range of 140-170 ohms. I'm following the procedure laid out here . Am I doing something wrong? Assuming the impedance is in the range of 150ohms, can I assume that signal loss is negligable since these connectors are extremely short?