I've successfully split the power coming out of my chain driven USB genator. What i did was purchase a 4-way USB splitter that does not require a supplemental power source. Then I attached two retractable USB cables and plugged the remaining ports with USB cable attachments (like the ones that come with the retractable cable in a kit).
I did that so the ports would be plugged with something inert (doesn't complete an electrical connection). Afterwards, I used all weather electrical tape and I sealed every connection and exposed metal ends.
The employee at Radio Shack in Mentor of Lake County told me today that the store is getting rid of the rest of their un-supplimentally powered USB hubs and that they plan on discontinuing their stocking of this type product. That's because they're not powerful enough to keep peripherals stable when trying to establish a data connection to a desktop or laptop computer. But when all you need is to split power to multiple devices, they'll do fine. I've used one in the car before.
My smartphone is mounted to my handlebars, whereas; my field GPS is mounted with 3 loose zip ties on the top bar of my bike. One of them is looped around the center column. I use my belt clip where I secure through one of those, then I use a mesh strap with a spring loaded buckle to tie the bottom of the lower portion of the belt clip. The problem is that the USB retracting cable has an attachment that is placed on the end to make it fit into the field GPS's USB port. Unfortunately, it is way too long to fit between the backside of the GPS and the top bar of the bike. Either one of two things will have to happen. Either I'll find an "L" shaped attachment, or I'll have to cut a new field GPS mount from something like wood and mount it to 1" rubber foam pipe insulation using some zip ties that will allow access to the USB port.
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