[TowerTalk] EFHW core

Jim Brown jim at audiosystemsgroup.com
Wed Sep 30 13:36:05 EDT 2020


On 9/30/2020 9:00 AM, Jim Thomson wrote:
> ##  Danny  Horvat is beyond a smart cookie.   How many  CM chokes do you see that cover  160-10m,
> with 8-12 K of  RS..and  RS  >  XS  ?   No  Z  bumps  either.   Ingenious staggered core design.   And  no,
> you wont blow em up with  4 kw.

The obvious question is, "is the winding on the ferrite core a choke or 
a transformer?"  Their behavior is VERY different. That it's being used 
at a hi-Z feedpoint suggests the latter. N6RK, also a very smart 
engineer, has used Fair-Rite #67 for high power transformers.

NA6O, another very sharp engineer who has done some serious lab work of 
chokes inside enclosures, emailed me directly questioning the 
dissipation issues with practical windings on Fair-Rite #61 and #54.

73, Jim K9YC


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