[Elecraft] KPA1500 in the IARU Contest Last weekend

[CUTTER DAVID]

Size is the most important parameter. 
 
I've read your tutorials several times and they are an inspiration but it's just like linear amplifiers: you can't say an amplifier designed for intermittent service like ssb or cw is poorly designed because it doesn't pass the BOK test. It's horses for courses. A properly designed choke for an ocfd will not over-heat but these are few and far between it seems.

David G3UNA/G6CP

> On 15 July 2020 at 21:07 Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> 
> On 7/15/2020 11:46 AM, CUTTER DAVID via Elecraft wrote:
> > Ferrite-cored chokes (balun) heat up and change apparent swr.
> 
> Not if they are properly designed and properly applied. And not all 
> antennas can be choked -- in general, only resonant antennas can be 
> effectively choked. Chokes applied to non-resonant and/or poorly 
> balanced antennas (like OCF wires) are, in general, NOT effective, and 
> WILL likely overheat.
> 
> I suggest a study of
> k9yc.com/RFI-Ham.pdf and
> http://k9yc.com/2018Cookbook.pdf
> 
> 73, Jim K9YC
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