Bai: If you have a Network Analyzer, just connect the cable to the two port of the analyzer through a BNC-SMA adpator. Measure the reflection coefficient (S11 or S22) and the 75 ohm cable should have a larger reflection. That's my expensive way of doing it.:-)
Alternatively, if the two cables are made of the same material, maybe you can check the ratio of outer conductor radius vs. that of inner conductor. The one with larger ratio should have high impedance. Regards Qu Pingyu > -----Original Message----- > From: Leslie Bai [SMTP:leslie_...@yahoo.com] > Sent: Wednesday, 14 July 1999 1:36 > To: emc-p...@majordomo.ieee.org > Subject: 50 ohm & 75 ohm > > > > Dear members, > > Anyone there can share the experience to measure > cables' impedance thus to identify whether a BNC > is a 50 ohm or 75 ohm cable. > > Thanks, > Leslie > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
