Ward

Member Since: August 21, 2008

Country: United States

  • It’s the one with the on-board antenna, EDI1.SPON.AL.S (System-On-Modules - SOM Edison Module IoT Internal Antenna) per Casey. From the Intel documentation, “Onboard antenna or external antenna (SKU configurations)” (emphasis mine), which leads me to believe that the version sold here will not be compatible with an external antenna. Looking at the photo, I see a u.fl connector and an antenna populated, with a tuning network between the two. If that’s the case on the shipping modules, you could in theory plug an external antenna in, but it would be in parallel with the on-board antenna which would present a non-50-ohm impedance to the wireless transceiver and impair performance. I suspect that you could depopulate the first (series) component after the u.fl and recoup that performance.

  • Thank you, CaseyTheRobot!

  • 1.5mm standoff: http://octopart.com/partsearch#!?q=DF40C-70DS-0.4V(51) Digi-Key has 51904 in stock, Mouser has 5261

    2mm standoff: http://octopart.com/partsearch#!?q=DF40C(2.0)-70DS-0.4V(51) Digi-Key has 8100 in stock, Mouser has 2613

    3mm standoff: http://octopart.com/partsearch#!?q=DF40HC(3.0)-70DS-0.4V(51) No stock

  • And I’m with ruffy, Intel’s documentation is unhelpful to say the least. In the data brief they state “Onboard antenna or external antenna (SKU configurations)” (emphasis mine). No guidance as to what SKU maps to what antenna configuration.

  • This is ridiculous. It shouldn’t be a hard question to answer, what version of the module did you order from Intel? It’s not a trivial question either, some versions of the module have the onboard antenna disabled. That’s kind of a big deal if you’re planning on using it. Conversely, if you’re planning to use an external antenna, buying a module with the onboard antenna enabled would be disappointing.

  • Funny, when I started my post below yours hadn’t hit the comment stream yet. Great minds…

  • Surplus Gizmos (http://surplusgizmos.com) in the Portland, OR area. They’re nominally electromechanical surplus, but they do carry kits.

  • Take another look at the RF connectors…they’re not actually u.fl, they’re switch jacks. In normal operation, the RF signal passes through them to the antennas, but when a coaxial probe is inserted into the socket it breaks the circuit and the RF energy is directed down the coax instead. It’s an and easy way to do RF test, a bit more expensive than a coaxial testpoint but the offsets are more consistent because the test gear isn’t in parallel with the antenna.

    On the battery, the third wire is a temperature feedback line for charging. Many lithium chemistry chargers have provision for this, as an added safeguard in the event of cell failure.

  • Sooo…it’s a $35 tachometer. Meh.

  • Indeed, that’s a fine solution!

No public wish lists :(