[Elecraft] K4D for bargain price on eBay

[Jim Brown]

On 3/12/2024 9:29 AM, jerry wrote:
> On 2024-03-12 08:56, evert at pa2kw.com wrote:
>> If someone could tell what manufacture/type/model these cores are, I'm
>> sure you can get this done for $20
>>
> 
> *** Generally, it's well known what mix is required.  Here's a good 
> article by Palomar Labs:
> 
> https://palomar-engineers.com/ferrite-products/ferrite-cores/ferrite-mix-selection

These people have NO CLUE about how ferrites work at HF. This piece is 
useless!

I wrote the book on this. k9yc.com/RFI-Ham.pdf

73, Jim K9YC