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Leon,
USB2 cabling can extend to a maximum of 25 metres by using 5 lots of 5m USB2 cable - but only if its
1) the type that have inbuilt repeaters and
2) so long as the terminating device has normal / low current demands
Whereas a normal 5 metre USB cable is $20 - a cable plus repeater (which is the size of a cigarette lighter at the end of the cable) costs between $30 - $50 (Jaycar are the cheapest)
Secondly a device like say a Meade DSI needs alot of current - more than normal USB 2 cable supplies - so they use a 25 gauage (vs 16 gauge) 2 metre cable.
The solution for this type of situation is run 25 metres of repeater based cable into a cheap A/C powered hub, and run the 2 metre heavy gauge cable from the hub to the imaging device. A normal unpowered hub won't do it!
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