In all electronic circuits present current and voltage. First of all you need to know power consumption for your USB-radio, my guess is it about ~200 mA.
If you don't know the power consumption of your radio, you can measure it by tester:

----USB-pin1--------------<     <---------------to radio
----USB-pin2--------------<     <---------------to radio
----USB-pin3--------------<     <---------------to radio
----USB-pin4--------------< <TESTER in amp mode<   <--------------- to radio 

If the power consumption >100 mA you are can't use OTG port without additional power. It may be USB hub or external power from board power supply, or from USB Host.

And why you are don't wanna use USB Host?


On Wed, Apr 18, 2012 at 5:01 PM, <> wrote:
Its my understanding that the radio doesnt draw any current.. so im not sure how that applies to this situation.  Im a programmer and maybe not understanding the problem.

-----Original message-----
From: Nikolay Rogoshchenkov <>
"General mailing list for gumstix users." <>
Wed, Apr 18, 2012 20:20:32 GMT+00:00
Re: [Gumstix-users] USB OTG port not supplying enough power? Or am I using the wrong cable?

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