Bill,
Don't waste your time on that old hardline. Lets arrange to have it shipped to
me. :-)
Bob
K6UJ
> On Nov 13, 2019, at 1:05 PM, Ralston, William <William.Ralston@viasat.com>
> wrote:
>
> Mike -
>
> I bought a 1000' spool of ½ inch hardline circa 2000 of unknown age (I don't
> recall the make, it wasn't Andrew, but it was compatible with the most common
> LDF4-50 connectors). I did note there was some oxidation of the copper near
> the cut ends, but cut off a few inches or more to get to clean copper.
>
> I wound up with two runs of approximately 430' each, and the loss measured
> out exactly as expected within the accuracy of my MFJ antenna analyzer.
>
> I am still using a 130' piece of that hardline now, and it measures within
> 0.2 dB of expected (again, limited by the accuracy of the MFJ259B).
>
> Assuming the jacket is intact and there aren't any kinks, it's probably fine
> at HF... can't speak to VHF.
>
> I don't if there are any theoretical concerns with aging of the dielectric or
> chemical outgassing from the dielectric oxidizing the copper. Any oxidation
> of the copper through the outer jacket is going to be on the outside of the
> cable, and thus not affect the electrical properties of the coax.
>
> --Bill N7VM
>
>
>
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