[Elecraft] Balun Questions.

[Dave Cole]

Hi Dave G0WBX,
I used to deal with some of those prior to retirement, worked in a
broadcast shop for about 40 years...  What a difference digital has
made to TV broadcast! :)
-- 
73's, and thanks,
Dave

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On Tue, 2016-02-09 at 17:54 +0000, Dave B via Elecraft wrote:
> 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.
> 
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