On 6/26/18 7:18 AM, Jim Thomson wrote:
## Forget what amphenol states. A teflon PL-259 will hi pot test a heck of
a lot higher
than a Type N. Type N uses a puny center pin, identical to a BNC.
Actually not - .120" (N) vs 0.053" (BNC) - you're looking at that
tapered guide pin, but that's not the current carrying part.
The center pin
on any PL-259 is huge by comparison. There is no RF on the center pin any way.
The
RF travels down the outside of the mating female of the SO-239.
Uh.. Current in the center conductor is equal to the current in the
shield. technically, current in the outer surface of the center
conductor matches the current in the inner surface of the shield.
The current *density* is higher on the center conductor (since the
conducting "layer" thickness is the same on both, and the center
conductor is smaller than the shield - so the heating limit (which is
one of the power limits for coax) is set by the inner conductor size and
the thermal conductivity to the outside.
Maximum power handling is kind of a tricky thing - voltage breakdown
usually isn't the limit unless the connector's insulating surface is
dirty. Thermal limits are more the problem. Think about it... the hot
part of a coax connector or cable is the "inner conductor" which is
surrounded by a nice thermal insulator like PTFE or foamed silica or
foamed PTFE.
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