> Brilliant!
> Just trust Tom that dielectric in the coax doesn't contribute to
> losses. Some "evaluation" of Force 12 products.
>
> Yuri
Dielectric losses in typical coaxial cables do not contribute
significantly to loss at HF.
The primary loss mechanism is conductor loss.
The reason various dielectrics might *seem* to produce different
losses is because the manufacturer, for a given overall diameter
cable, can use a larger conductor when the dielectric has a larger
percentage of air. Higher velocity factor cables, for a given diameter
and impedance, have less loss because the center conductor is
larger.
This really is well-known and widely published, but it is probably
worth repeating because the myth that the dielectric is somehow
responsible for dissipating significant (or even a majority of) power
keeps popping up.
73, Tom W8JI
W8JI@contesting.com
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