Jim Lux writes:

W4NNG wrote:
Hello everyone

Like Mike, I also have the MFJ-1800. And boy was I surprised when
none of my shack full of type N to SMA adapters didn't work. I
can't believe they reversed the polarity of the center pins for
WIFI SMA connectors. Urrrrgh !!!

Required by Part 15..Has to be a connector with is "not commonly
available". Reverse Polarity SMA and TNC connectors are pretty
standard for this application, to the point where you can get adapters
and jumper cables pretty easily.

And soon, we're going to get radios which use reverse polarity
connectors, because they're more easily available :-)

LA4RT Jon