[Elecraft] loss of RX sensitivity

[Don Wilhelm]

Andy,

The PL259 to SO239 connector "end face" contact is provided only by 
pressure - it is not a sliding contact as you would find in a BNC or an 
N connector.  The pressure is provided only by the tightening of the 
threaded portion of the PL259.

I ask you - just how much resistance can be expected if you just touch 
two ends of wires together without further positive contact?

The "insulating spacer" is any oxidation on either the SO239 or the 
PL259.  That is why I like silver plated UHF connectors.  They may look 
a bit corroded, but the silver oxide is conductive even though it can 
appear brown or black.  If you are shopping for UHF connectors at 
hamfests, avoid all those nickel-plated ones that a not Amphenol, but 
flock to those that are oxidized, and silver plated with Mil Spec 
designations on them.

73,
Don W3FPR

On 9/17/2018 6:39 PM, ANDY DURBIN wrote:
> " the threads of the PL259 are providing the only contact with the SO239"
> 
> 
> In the connectors that you are mating how do you prevent contact between the end face of the PL259 body and the end face of the SO239 body? You would need an insulating spacer for your statement to be true.