[TG11] RV-100 Axiom9 depth issues

[Tom - Raymarine - Moderator]

Hello racerx,

Sorry for the delay replying.

Thanks for the videos, that's really helpful. What you're seeing in the Sonar channel and at the start of the video in DownVision is what we call 'Bottom Search' mode, when the sounder's cycling through different ranges and pulse-lengths in order to try to acquire bottom lock. Once the system does get a lock in the DV video, the bottom signal looks very weak, which explains why it took the time.

When you have a weak-looking signal, the problem is either that the bottom echo really is weak or that there's a high background noise that's causing the system to have to drop the gain - in order to try to keep the noise clutter off the screen - and is also ending up tuning out most of the bottom echo as well. In order to tell what's happening we need to run some tests in all Manual gain setup, as described in this FAQ.

Has the system always done this?

If you can have a look at that FAQ and then send us some images in the all-manual setup it describes, we'll be able to tell you more about what's going on.

Thanks,
Tom