[CA] RD424HD "No Radar Source Found"

I'm getting an unexplainable "No Radar Source Found" message on my a98 (software v.19.03) when communicating to a RD424HD.

I've Googled-searched this issue and read that the problem is generally linked to a poor power/battery supply. I don't think this is the case here. I have 2 new 24-series Interstate marine batteries; a new electrical system with new fuse block and new bus bars. Dielectric grease at every connection. Heat shrink on every terminal. Batteries are continuously being fed by shore-power. I'm fairly certain that I'm not having a power supply issue here.

The RD424HD was previously connected to a E140w through an SR6 weather station and one of the 6 SeaTalk HS ports and worked fine in this setup. Of course, the power/communication radar cable has an RF45 connection on the data portion when connected to the E140w. Subsequently, to use this same cable on the a98 (which has no connection port for RF45) I purchased an A80247 adaptor (female RF45 to SeaTalk HS).

The SR6 is no longer in the setup. That unit was removed (and I'll be happy to give it to anyone who can fix my radar issue!!). There is no cross-over cable. Right now I have a really simple connection from the radome to the radar cable to the A80247 adaptor to the a98 display.

The power side has the red (positive) 12 gauge cable fed directly to a Blue Seas fuse distribution panel (15-amp fuse) and the black (negative) goes to the negative bus-bar. The drain wire is independently wired but goes to the same negative bus bar.

I'm at a loss of what to look at next. Your thoughts?

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