On 10/23/2024 10:47 AM, Art Greenberg wrote:
I'd have to decoil it to get a length measurement as well.
You can estimate the length within several feet by measuring the
diameter of a typical loop (they must all be approximately the same size
loops within a couple inches, although you can estimate a correction for
slightly-different loop sizes) then multiplying that in your head by 3.
Then add in another tenth and a bit more to make up the additional 0.14,
which is the same as calculating a typical loop's circumference by
multiplying the diameter times 3.14 with a calculator (it's easier to
calculate in your head in terms of feet rather than inches). Then
multiply the resultant estimated circumference by the number of turns of
cable; and hey el presto: that's about how long the hunk of cable is. I
usually manage to come within a few feet of a coil's actual length of
100 - 200 feet of coax by doing this.
When estimating the length of something that is extremely flexible such
as rope or small cable, simply grab the cable coil at opposite ends,
pull each end of the coil out so you flatten it, then estimate the
length of the flattened sides. Multiply by two to get the approximate
length of a loop, then times the number of loops,and hey el presto
again: you know the approximate length of the coil of rope.
Of course, when estimating cable or rope lengths like this, it's always
best to assume the coil is slightly LESS than what you've estimated, so
that it turns out to be a bit LONGER than you needed 8-)
Steve, K0XP
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