[Elecraft] Windows 8.1 tablet power

[Mark N2QT via Elecraft]

Actually the issue is the tablet is able to supply power to external devices, which must be
disabled when the unit is being charged from an external source.  Best I can tell in some
devices The direction of power is either negotiated by a digital message upon connection 
of an external device or by shorting or opening the data lines when the unit is to be 
charged.  It looks like Dell tablets can operate with specific adapters but there is no 
guarantee this would work on another brand (and lots of review comments saying it doesn't).

This was all a surprise to me, I just figured I could hook things up and go. 

Mark. N2QT

> On Jul 7, 2015, at 11:50 AM, Tom <tomb18 at videotron.ca> wrote:
> 
> Hmm, that's interesting. Have you tried a powered USB hub? I would think that should work. 
> 73 Tom 
> va2fsq.com
> 
> Sent from BlueMail
> 
>> On Jul 7, 2015, at 10:57 AM, Mark N2QT via Elecraft <elecraft at mailman.qth.net> wrote:
>> I bought a win 8.1 (not RT) tablet from Cowboom for $59, hoping to interface it using its
>> micro USB port.  However the USB port is the only way to provide power to the thing,
>> and battery life is such I'd like to leave it on charge while operating, while not losing the
>> USB port data functionality. 
>> 
>> The unit is sold by Best Buy under the Unbranded name. 
>> 
>> Anyone have luck powering such a tablet without losing the USB data capability?  
>> 
>> Mark. N2QT
>> 
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