DRS4W issue help please?

[Brent]

Wondering if anyone can offer me some advice.

I have just installed a new Furuno DRS4W on top of my cruiser. Running it in the marina and you will see the first screenshot, it is exactly what i expect to see, based on the environment. As each revolution happens though, it seems to reduce the the information on the screen, and with in 80 seconds or so there is not much info left at all. You will see my three pics from the start, then about 30 seconds in and then about 60 seconds in.

I don’t think this should happen should it? I thought the first image should stay constant, given it was a static environment? any help really appreciated.

inhave also attached my installation for reference.

 

[FishTech]

What you are seeing is indicative of reflections too close to the radar causing it to de-tune in an attempt to protect itself.
It could be the light bar and VHF antenna right up against the back of it. You could start by setting up a Sector Blank. This is found in the Picture Menu on the fourth page. A good starting point would be 20°. I'll put an example picture below. This would stop the radar from transmitting into the light bar and VHF antenna.
It could also be all the vessels in close proximity around you.

 

[Johnny Electron]

Looks like those whip antennas behind the radar are a bit close as NMEA 0400 installation standards require at least 3 feet or more distance. Not sure if that is the problem but @FishTech is correct the way the radar is reacting is that it is getting reflections causing the auto clutter to filter out.