There are 2 sizes of coaxial power connectors - 2.1mm center pin and
2.5mm center pin.
All Elecraft gear uses the 2.1mm size. If you have used the power
connector supplied by Elecraft, then it should be correct.
OTOH, if you used a different power plug (perhaps salvaged from a
wall-wart), check the size of the center pin. If you have some #12
solid wire you can do a quick test. The #12 wire will fit into the
center of a 2.5mm plug, but will not fit into a 2.1mm plug. (#14 wire
will fit snug in the 2.1mm plug).
I recommend using #16 wire from the power supply to the KX3, especially
if the length exceeds 4 feet. While the #18 wire supplied by Elecraft
is quite adequate, #16 wire will have less voltage drop during periods
of higher current (Transmit conditions).
73,
Don W3FPR
On 12/27/2014 5:03 PM, Mark, KE6BB via Elecraft wrote:
The problem is often with the coaxial power connector. If the operator isn't
using the cable supplied by Elecraft, it may not make reliable connection with
the radio. There are a lot of connectors on the market that are close to
2.1mm, but really don't work. I found one that had all the right diameters,
but was simply too short.
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