On February 7, 2018 at 10:03, ericspencer said...
Assuming these are all RG6 shield constructions you are referring to, the statement that quad shield has lower loss is not completely accurate.
Belden 1694A dual shield solid copper center 6.3dB/100ft @1000MHz
Belden 7915A tri shield solid copper center 6dB/100ft @1000MHz
Belden 7916A Quad shield solid copper center 6dB/100ft @1000MHz
Belden 1189A Quad CCS copper center 6.55dB/100ft @1000MHz
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.