Today i moved my whole setup outside.
I tried two cables, both 5 Meter, both five-times shielded, both with similar dimensions of shield and core.
But one cable with copper/steel core, the other with pure copper core.
The message rate shows the difference, over the time the amount of aircraft in range was similar.
looking at it seem to be that i have to reduce the gain now. The messages > -3dB has been increased with the new wire, even if the amount of aircraft is pretty low currently.
Itâs just a coincidence. The 1GHz signal travels only on the surface of the wire anyway (skin effect). The penetration depth of 1GHz is 2 micrometers.
The insulation between the core and the shield makes much more difference (transversal losses).
DC losses are different, but not applicable in your case.
Also, if water gets into the end of the cable, the steel core will rust quickly.
The RG specs are basically dimension specifications. CCS cables tend to be a cheaper alternative, since steel is much cheaper than copper - they often use an aluminium braid instead of copper as well.
Itâs pretty common for CCS cables to not have as good screening as a âgoodâ coax as they have less coverage by the braided screen. A decent copper coax with good braid coverage will likely outperform a cheaper CCS coax.
There might be also some lack of quality control of dimensions and materials.
Manufacturers (of cheap cables made in a certain country) will sometimes claim specs that are just copied from generic ones, but in reality they are really off.
The advantage of copper core cables might be also that the material itself is more expensive and therefore very unlike to be used in that kind of factory, oriented on cheap products with thin profit margins.