Hi @BooD, welcome to the forum 
What was the charger’s current capacity for the enclosure electronics? We normally use a 5V6A supply in the enclosure, which is more than many chargers supply.
The Technical Details of the Tether page have a stated resistance of 0.127Ω/m, which would be ~38.1Ω for 300m, so that’s as rated.
Assuming you’re running Companion’s Network testing, that’s an indication of ‘remaining capacity’ (beyond the ongoing operations, like the camera + telemetry streams) rather than ‘total capacity’, so it can depend on what else is running on your ROV. Network performance can also depend on the network capabilities and other ongoing network activities on your topside computer, as well as things like nearby sources of electrical noise and whether the tether is coiled up or unrolled.
Running our latest companion software (0.0.30), over ~3m of tether, I get
If I then use the webterminal (http://192.168.2.2:8088) to quit the running screen sessions (beyond the webui/webterminal, so basically turn off video + telemetry + other services):
for SESSION in $(screen -ls | grep "(" | cut -f2 | grep -v web)
do
screen -S $SESSION -X quit
done
that then moves up to
(normal functionality can be restored by rebooting the Companion computer)
Bypassing the Fathom-Xs and tether with a 2m CAT6 ethernet cable directly from the Companion (Raspberry Pi’s) ethernet port to my computer, that then gets a touch higher to
Understandably a longer tether will have worse performance than my short test length, but testing with an ethernet bypass will at least give you some sense of the network performance your computer can achieve with the Companion. If that’s close to your current performance then it perhaps makes sense to try a different topside computer.
If that does help significantly then we can try to help figure out which part of the communication system is reducing the performance. If you’ve got an FXTI box my initial guess would be to try swapping out the internal ethernet to USB converter, or just bypassing it with an ethernet cable (between the internal Fathom-X board and your computer).
