w8ji.tom wrote:
>Like you and Roy Lewallen, I have measured the baluns and tested them for
>performance AND life. I've been using them for 25 years or longer and have
>NEVER had a balun failure. Just don't exceed the bending radius rating of
>the coax, or overheat it, and it will last the life of any coax in the same
>environment.
>
A TV transmitter engineer told me about a length of RG213 that was being
used as a UHF attenuator, so it was intentionally running quite hot in
continuous broadcast service. Even then, it took 7 whole years for the
inner to migrate to touch the outer.
In normal amateur HF use, it will simply never happen within the
lifetime of the coax and/or the operator.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.demon.co.uk/g3sek
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