I had a video transmission failure yesterday. Working at a remote site, I found that I had intermittent loss of video signal, and lag of upwards of four five seconds, and digital compression artefacts. ROV control signal and feedback was still working. (Tested lights, helming commands and camera up/down) The ROV could be operated, but no useful video. The mission was scrubbed.
I’ve just tested back on the bench. Same faults as in the field. Connecting directly to the board by ethernet, all good. Swapped out tether to a test cable, issues persist. Swapped out topside Fathom X to my remaining spare, faults rectified. That’s two Fathom X boards I’ve had die, or part fail.
I’m presuming that something has happened to the board, dropping the available bandwidth or data transmission rate to below a rate that can support the video stream.
Lesson learned: don’t leave your spare Fathom X back in a vehicle when working 30nm away on a boat.