[Elecraft] Power oscillation problem (KPA500+KAT500)

[Jim Brown]

On 11/20/2023 8:00 PM, Rick NK7I wrote:
> In that search, high on the list of suspects (right up there with 
> failure of any antenna elements) is damage from tiny livestock (mice, 
> rats, birds that may have gotten into the attic or bugs like mud wasps); 
> chewed wires, cables and insulators.

More possibilities. Back in Chicago, I traced an intermittent in an 
antenna to a junk connector adapter. After getting back on the air in 
2003 after 20+ years off, I made the mistake of restocking my parts 
stash with junk adapters from a Chicago flea market. Over the next five 
years, I traced a half dozen failures to them as a cause. My definition 
of a junk connector is one that isn't stamped "Belden," or with a MIL 
part number, or one of the types made for hard line.

Perhaps a ferrite choke that is poorly designed, under-rated for the 
specific use, or used with a badly imbalanced antenna has failed. They 
do that. :) And, of course, loose connectors.

73, Jim K9YC