All true! NL7Y was referring to coated wire, though, which is certainly different than the velocity factor of coax propagating TEM waves.
I didn't know that Cebik's site is still up. That's good to know! Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Roger Parsons Sent: Sunday, December 30, 2012 5:01 PM To: Topband Subject: Topband: Fw: Short Bogs Tom was not referring to the sheathing on a cable but to the velocity factor of coax. Not the same thing at all. It is well established that covering a cable with a dielectric will change its electrical length. The late LB Cebik's site (which is still accessible) quantifies exactly how much with different dielectrics. It can range up to about 7 %, and in my experience LB's figures are spot on. 73 Roger VE3ZI _______________________________________________ Stew Perry Topband Distance Challenge coming on December 29th. _______________________________________________ Stew Perry Topband Distance Challenge coming on December 29th.
