# USB Drop camera **URL:** \ **Category:** DIY USVs\ **Created:** [March 28, 2022, 9:49am UTC](https://discuss.bluerobotics.com/t/usb-drop-camera/11827 "2022-03-28T09:49:57Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [March 30, 2022, 5:46am UTC](https://discuss.bluerobotics.com/t/usb-drop-camera/11827/6 "2022-03-30T05:46:19Z")
> [@FairweatherIT](#): > > How long is the subcon tether? USB 2 can work up to ~30 m and USB 3 can work up to 18m. That’s with an active/repeater cable - for a single passive USB 2.0 cable length is limited to ~5m ([source](https://www.yourcablestore.com/USB-Cable-Length-Limitations-And-How-To-Break-Them_ep_42-1.html)). From [the USB 2.0 specification](https://www.usb.org/document-library/usb-20-specification) (section 6.1) high-speed and full-speed cables should have a twisted pair for the signal wires (as @Outland suggested), and also shielding (as @FairweatherIT suggested). Given you have quite a long cable, which most likely has straight wires and no shielding, it’s not too surprising that it’s having signal issues. > [@Alex\_UJI1](#): > > I am using the Low-Light HD USB Camera (same as BlueROV) which is fitted inside a small acrylic cylinder, and I need to connect it to the Raspberry Pi3 inside the electronics enclosure. This makes it seem like the cable would only need to be quite short - would you be able to describe your setup in some more detail? It seems a little odd to be using SubConn bulkheads and connectors for this unless the setup is going very deep, and given the costs I’d probably expect a connector on one end and a penetrator on the other. You might want to look into [Cobalt Connectors](https://discuss.bluerobotics.com/t/new-waterproof-connectors-from-blue-trail-engineering/7296) - @damonblue has [previously mentioned](https://discuss.bluerobotics.com/t/usb-bulkhead-connector/11275/8) that they offer USB-compatible bulkheads and cables 🙂 --- _[View the full topic](https://discuss.bluerobotics.com/t/usb-drop-camera/11827)._