Try 0.66 and measure a piece of the same cable with a ruler and the VNA.
Adjust VF until the two agree.
If you can see the dielectric, use the VF for another cable with the same dielectric.
Glenn
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On 2/7/2022 10:15 AM, Jim Lux wrote:
On 2/6/22 8:33 PM, lobos305 via groups.io wrote:
What velocity factor would you use to measure the physical length of a cable when you don't know the cable type?
You have no way to know, unless you make another measurement to compare physical and electrical length.
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Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
