> Anyone else get similar results when checking this type of cable?
I've been building phased arrays recently, and I too have been
measuring the velocity factor of RG-6. Some Belden 1189A
used for end-fire phasing lines measures 83%, which is consistent
with the datasheet. On the other hand, 4 1000' lengths of surplus
"satellite TV" coax measure 83%, 78%, 75% and 76%. All of
these "RG-6 type" cables are foam. They make acceptable feed
lines when "adjusted" for constant propagation delay. "Electrical
length" is another way to express that concept.
Victor, K1LT
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