Steel, being magnetic, is quite lossy at RF.
OTOH, aluminum at RF is only 28% lossier than copper.
However, no RG-6 (AFAIK) has a copper clad aluminum conductor.
Rick N6RK
Jim Brown wrote:
> On 1/23/2013 2:58 PM, donovanf@starpower.net wrote:
>> 1.8 0.3 0.6 350
>> 3.5 0.4 0.6 500
>
> Yes, and you can see this difference in mfr data sheets that are
> sufficiently detailed (Belden, for example). The differences are
> greatest at the lowest frequencies.
>
> Note also that copper clad aluminum does not suffer nearly as much from
> this, so I suspect it's the effect of the steel on the distribution of
> current. For example, loss in LMR400 (Cu clad Al) is quite close to
> solid Cu of the same diameter (Commscope 3227, #10 solid copper, same
> shield as LMR400) on 160M.
>
> 73, Jim K9YC
> _________________
> Topband Reflector
>
>
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