So I took the upper back cover off my N810 to fix the intermittent on the left speaker (and did that with no trouble). While I had it off, I noticed a little tiny coax connector with no cable connected to it, and on examination, the center pole connects to the ground plane, so it's a reverse-polarity connector. These are commonly used on WiFi and such because FCC regulations prohibit use of industry standard connectors on devices certified only with their provided antenna, and reversing the polarity is enough to be nonstandard, but allows them to use standard parts. So I'm strongly suspicious that it's an external WiFi/BT antenna, and if not, it has to be GPS.

Anyone seen this connector before? Can anyone confirm what radio it's for, and/or identify the connector designation so I can order a connector or pigtail? It'd be really awesome to be able to add an external antenna jack to my N810, for either WiFi or GPS.

If nobody has input over the weekend, I'll be able to measure it at work Monday and look up what it is. But I'd rather have parts ordered by then...