Hans, I have seen foam filled hardline with velocity factors in that range.
Your loss test shows that the cable is ok.
73,
Gerald K5GW
In a message dated 10/8/2014 10:19:35 A.M. Pacific Daylight Time,
towertalk@contesting.com writes:
Dear Ham Friends,
Recently I checked my feed lines to my tower. I have 1" hardlines, each 88
feet long. I checked the loss by measuring the SWR at various frequencies.
(~0.8dB @150MHz)
I decided to also check the velocity factor. I was a little puzzled to get
a factor of 0.8. Does that make sense? It's a foam filled coax. I expected
something around 0.9.
My resonances were 2.2, 6.767, 11.228, 15.673, 19.945, 24.335, resp. 28.53
MHz indication an electric 1/4 length of 33.73 meter or 110.67 feet.
88/110.67=0.795.
Any comments? Did I do anything wrong? The coax were open in the other
end. Does that give me the wrong value?
73 de,
Hans - N2JFS
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