Topband: Coax velocity factor

[Charles Bibb]

Hi, All

I'm installing an end-fire pair of phased Beverages here and decided 
to actually measure the velocity factor of my coax (RG-6, foam 
dielectric) before cutting the phasing line.  Measured out a given 
length near 50 feet, known to the nearest inch, shorted the end and 
swept for the first Z minimum with my trusty Auteck RF-1.  Made half 
a dozen or more Z measurements and then double checked the length of 
the cable.  Every time I get the same results: VF=84%.  This just 
seems a tad high to me, especially when 75% is the published value 
for RG-6, though I know the VF of foam cable is higher.  Could the 
frequency display on the RF-1 be off, or is this value typical?

Anyone else get similar results when checking this type of cable?

73,
Charles - K5ZK