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For better shield performance, some cables have a double-layer shield. [5] The shield might be just two braids, but it is more common now to have a thin foil shield covered by a wire braid. Some cables may invest in more than two shield layers, such as "quad-shield", which uses four alternating layers of foil and braid.
It's not 100% Shield, 1/2" Hardline is 100% shield and it's only a touch better than #9913 @100 feet. I've seen Mil-Spec coax with 2 shields and a mylar foil wrap that aren't any better then a good chunk of Belden #9913 or Pro-Flex both of which are air dielectric. Before I go editing I'm going to do some research on it.
3C-2V is commonly marked on low cost coaxial cable used for domestic TV signals. It is one of the options of the Japanese cable standard JIS C 3501. The 3 indicates approx diameter of the conductive core plus the dielectric (diameter of conductive core =0.5 mm, dielectric thickness =1.3 mm) The C indicates a characteristic impedance of 75 ohms
Cross-section through a coaxial cable showing shielding and other layers. One example is a shielded cable, which has electromagnetic shielding in the form of a wire mesh surrounding an inner core conductor. The shielding impedes the escape of any signal from the core conductor, and also prevents signals from being added to the core conductor.
A common type of 75 ohm coaxial cable is cable television (CATV) distribution coax, used to route cable television signals to and within homes. CATV distribution coax typically has a copper-clad steel (CCS) center conductor and a combination aluminum foil/aluminum braid shield, typically with low coverage (about 60%). 75 ohm cables are also used in professional video applications, carrying ...
The outer (shield) conductor is connected to a quarter-wavelength conducting sleeve into which the cable is inserted, and the inner conductor protrudes vertically above the sleeve for a quarter-wavelength. Also, additional quarter-wavelength sections may be connected to the outer conductor to form a better ground plane.