[Elecraft] KPA-1500 failed!

[Drew AF2Z]

Stiction of non lubricated threads can give a false sense of tight 
connection. PL259/SO239 in particular can have poor contact through the 
ground conductors while the thread seems tight.

When the threads are lubricated stiction does not occur and hand 
tightening always ensures that the front ring of the plug is butted 
against the mating surface on the SO239; and that the rear lip of the 
shell is firmly butted against the short threaded section at the back of 
the plug. These two narrow ring surfaces with relatively small contact 
area are essential to good ground connection in the PL259.

73,
Drew
AF2Z




On 02/16/19 23:22, Jim Brown wrote:
> On 2/16/2019 3:07 PM, Drew AF2Z wrote:
>> This allows very tight snugging by hand, no need of wrenching. 
> 
> What's the logic behind that?
> 
> 73, Jim K9YC
> 
> 
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