Some years back, I purchased a 500' reel of Belden 9913 and used a bit here and
there over the years. Now I needed four 70' runs to the base of my tower but
didn't know how much 9913 remained on the reel.
My DVM can measure capacitance so I connected it to the free end of the reel
and measured 6300 pF. Belden says that 9913 capacitance is 24.6 pF/ft so
dividing that into 6300 pF implied that I had 256 ft remaining. That was
enough for three 70' runs but not enough for four, oh well.
I cut three 70' lengths from the reel, 45' of cable remained. (3 x 70) + 45 =
255. That is just 1 ft less than what was predicted by the capacitance
measurement !!! Isn't it nice when the numbers work out so well. Will I rely
on that technique in the future? Nope, gotta see it work out like that a few
more times first!
-Mike-WA6ZTY
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|