[Elecraft] Windows 8.1 tablet power

[Jack Brindle]

You should be looking for a USB-C docking adapter. It supplies power for charging and extends the USB for devices to connect.
They are relatively new - there aren’t that many USB-C systems out so far, so you should expect them to be somewhat expensive.
But, the adapters are available. I know that Apple sells one for their MacBook, which uses USB-C. Might be a good starting point,
but keep looking to find what you really want.

A standard USB hub will not provide what you need...

73,

Jack, W6FB

> On Jul 7, 2015, at 8:57 AM, Mark N2QT via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> 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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