[Elecraft] K3 power supply question

[Paul Christensen]

> problem.  You probably can make a decent connection without a special 
> tool--it's just harder to do.

I would suggest that if someone does not have a precision APP crimp tool 
that they simply solder the pins, despite the fact that in the long run, 
cable flexing and vibration will eventually become problematic.  If the 
crimp is not performed correctly, the flat mating surface will oftentimes 
become distorted and out of alignment with the crimped portion.   If this 
occurs, one will usually see a bend in the overall pin.  The bend carries 
over to the mating surface when steated into the shell.  If that pin is also 
mated with a similar bended pin, then all bets are off.

The APP connection is marginal for 20A DC circuits -- the kind of current 
when the 100W K3 is transmitting at full power.  If the connector manages to 
come loose while transmitting, the pin surface can form a weld spot.  The 
underlying principle and quality of connection is 100% dependent on the 
alignment of the two flat surfaces.   I absolutely detest APP connectors and 
I have the best cable prep tools available.  However, I suppose use of the 
connector can be forgiven in light of its growing popularity.  Even Collins 
used riveted RCA jacks for the RF ports on the S-Line.  Nobody is perfect.

Paul, W9AC