[BC] Wave lengths (has migrated to coax construction)

[Phil Alexander]

On 20 Feb 2006 at 14:50, Dave Dunsmoor wrote:

> All this discussion on velocity factor, then coax construction caused me to
> wonder,
> 
> 1)    could a broadcast version of triax be built,

It would violate no physical laws, thus it becomes a commercial question.

> 2)    would it be practical and,

Probably never become cost effective considering the power handling
differential would be fixed by the size of the outer/outer.

> 3)     would it be useful...?

To a limited extent IF fittings were comparably priced, which is most
unlikely.

> Triax being the inner conductor of the 3" or 6" coax being hollow, could
> then have it's own inner conductor to comprise a second coax of much smaller
> size... to be used for STL, Marti, whatever....

The problem would be the limited specialized applications and the
expense of adapters/connectors etc. Manufacturing expense would
be high as a function of low volume. The trend is to less variety
and higher manufacturing volume, not the reverse.

Thirty or forty years ago, this might have been a very good idea.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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