[Elecraft] Balun Questions.

[Dave B]

On 09/02/16 17:15, elecraft-request at mailman.qth.net wrote:

<Snipped>
> > If you lose, it is never good when the center conductor shorts to the
> >shield at Kilowatt power levels.  Use loops large enough to stay within
> >the bending radius of your coax.  Now if this is QRP, you could
> >probably get away with it.

There are coax cables out there that can run safely too hot to handle.   
Teflon dielectric and FEP outer cover.

It's used in multi kW industrial amps and power combiners, wrapped 
around many ferrite cores, often with fan cooling, for the ferrite, not 
the cable!

Commercial (Broadcast) baluns too are sometimes immersed in oil, much 
like power transformers, for cooling.  That's at the 10's of kW power 
level.   But the coax is the high temperature stuff again.

Use suitable cable for the job, not cheap polyethylene stuff.

Dave G0WBX.