Actually it works quite well with all the Ubiquiti radios I've tried including the nanobridge. I think that a laptop USB only puts out 2..5 W until the attached device negotiates for 5 W. I think the key is that the power ratings specified for the Ubiquiti are maximums not typical. I can imagine that the radio burns much more power when it is heavily utilized but not so much when it's just being programmed.

On Mon, Apr 6, 2015 at 10:51 PM, Marc Juul <marc@juul.io> wrote:

On Fri, Mar 27, 2015 at 12:21 AM, Martin <dcmk1mr2@gmail.com> wrote:
Really handy for installs:
http://www.streakwave.com/itemdesc.asp?ic=TP-DCDC-2USB-24

Useful, but only if your laptop can deliver enough power. A nanobridge takes about 6.5 watts and normal USB 2.0 ports are minimum 2.5 watts (though apparently many are rated at 5 watts?). USB 3.0 is 9 watts and the yellow "always on" USB 2.0 ports are also capable of providing enough power.

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marc/juul