On February 7, 2018 at 11:18, Brad Humphrey said...
Hmmm... yes it does. And you just showed it true. Notice how the loss per foot goes down with each increase in the amount of material for the outer conductor. Which is just really common sense.
The last one gets worse because it is copper clad steel center conductor. That is the limiting factor on that cable, all else being equal.
One last attempt... Belden explains .. Note: no mention of reduced attenuation.
Duobond II (Foil/Braid)
Combines all the features of Duobond with an outer braid applied for greater protection against interference and to increase the overall tensile strength.
Duobond III (Tri-Shield)
Duobond III utilizes the Duobond II design (foil/braid) plus an additional surrounding layer of Duofoil. This extra layer of foil improves shield reliability and provides an additional interference barrier.
Duobond IV (Quad Shield)
Duobond IV adds a second layer of braid to the Tri-shield design (foil/braid/foil/braid). This extra layer of braid shield provides improved strength and durability.