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I built my 4 port power/USB hub by savaging the innards of a 4 port hub and building in a +5V power supply of 2.5A for the USB hub power.
A bit of overkill but it runs: USB DSLR; Autoguider USB; USB focus controller; and USB webcam all at once with them all active. Also recognised and runs USB/RS232 converter just fine. Connected back to lappy on 5m lead.
So USB hubs...try to use a powered one not a self powered as these may not have enough current capacity.
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