Sourcing appropriate power cable for Raymarine digital radar?

[Cardo]

Sorry about the title, I appreciate it's a bit of a mouthful!

Issue is thus:

I installed a new radar on the boat, a Raymarine digital radome. It has a genuine Raymarine cable running down the mast and through the deck fitting. When it comes into the boat, the cable is continued using DIY cables. I have an ethernet cable for the signal and an appropriately sized 2 core power cable for the, uhm, power. These cables run down the compression post along with all the various other cables, including the cable for the VHF radio antenna.

Unfortunately, when I turn on the power to the radar, I get a lot of noise (a hiss?) through the VHF. I have a feeling it's EM interference picked up from the radar power cable as the cables run up the compression post. The Raymarine cable is shielded, but I haven't been able to find any shielded power cable of the appropriate size for the bit inside the boat. I could always get a Raymarine extension cable, but at £140 for 10m, I'm looking for other solutions first!

Has anyone experienced this and have any thoughts or solutions? Have I got it completely wrong and is the problem likely to be something else?

Cheers all.

 

[ostell]

Have you checked the outer on the coax for the radio? Is the ethernet cable screened, and the screen connected? Tried some ferrite beads on the power leads?

 

[brokethebox]

Please excuse my ignorance for i am no technical whizz, but you could try those wee ceramic spacer things you put around cables to keep them from touching... I'm sure someone on here will give a better definition of what i mean!

J

 

[ostell]

you could try those wee ceramic spacer things you put around cables to keep them from touching... I'm sure someone on here will give a better definition of what i mean!J

Ferrite beads. Supplied in several styles

 

[brokethebox]

brilliant, thanks ostell.