I fully agree.
In a co-co you are using the coaxial sheath as one of the receiving elements anyway, it’s not shielding.
This is partly correct.
The shield performs both the receiving as well as shielding functions.
The OUTER SURFACE of shield receives the RF signal when Radio wave from aeroplanes strikes it, but remaining thickness of the shield prevents the Radio waves to penetrate it and reach the core wire.
The core wire acts as phasing element, and to perform optimally, it should not intercept any Radio wave arriving from the aeroplanes.
Most dual shielded (1 foil+ 1 braid) coax have about 95% shielding and allow less than 5% RF signal to reach the core, hence perform well.
This is the most commonly used coax for Satellite/DBS and also used for coco making, and generally gives good performance both as coco & medium length TV/Dish cable.
The quad-shielded (2 foils + 2 braids) coax has shielding higher than 95%, and is used for transmission of RF signal where RF noise is high.
This is costlier compared to dual shield. If used in coco, it will somewhat improve the performance of coco, but not much.
EVOLUTION OF A COCO / HOW A COCO WORKS
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