On 7/8/2011 7:09 PM, TexasRF at aol.com wrote: > > Velocity factor is known to have variations from run to run, especially in > the foam dielectric types of coax. This makes published data an > approximation at best. Velocity factor also varies with frequency. See http://audiosystemsgroup.com/Coax-Stubs.pdf 73, Jim K9YC