> > When a short coax patch lead comes with it's own calibration certificate you just know it's expensive! My good attenuators come in a wooden case, with NIST traceable curves, specified to two decimal places. :) APC-7 connectors. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist