Sheilding a transducer cable

[Got One]

I have a HDS 8 and Icom 304 radio in a new boat. I took it out this weekend for the first time and was calling a friend and he heard every third or forth word I said. I also noticed a spike on my sonar whenever I transmitted. Today I ran a seperate 8 ga. hot and ground to the dash to isolate each unit. When I turned on the weather I heard every ping from the sonar on my ship to shore. They have my transducer cable in a bundle with everything else running to the back. It will take time to seperate but I feel thats my only option. What would be the best thing I could cover the transducer cable in after I seperate ? I can move it about 5 inches away from the rest of the wires for about 85% of the run when I re-install. Thanks

[blueicecpa]

I think Airmar makes them for Lowrance.

I would look at the cable to make sure it is not frayed.

http://www.airmar.com/pdfs/cat/marine/cables.pdf

Shielding
Airmar cables use three shielding techniques: aluminum foil
wrap with drain wire, tinned braided shield, and tinned spiral
shield. Aluminum foil provides very good shielding at a low
cost. However, stretching and kinking of the cable also
stretches and kinks the wrap which can result in the fine tearing
of the aluminum foil. Because of the larger number of copper
strands, braided and spiral shields strengthen the cable so it is
much less affected by stretching and kinking.
Braided and spiral shields are usually stated in percentage of
shielding, i.e., the amount of braid coverage as a percentage of
circumferential area. Airmar braided and spiral cables range
from 60% to 96% shielded. Some other transducer brands have
braided shields, but the coverage can be as low as 35%.
For commercial use, a braided shield and durable jacket material
are essential. In recreational applications, aluminum foil
provides good shielding. In multiconductor cables, braided
shield is a high quality alternative.

[perchjerker]

How close is the sonar display to your vhf antenna? If its too close that could cause it also

[JDP]

I would listen to Perchjerker's suggestion...My Lowrance sonar would blow a fuse whenever I transmitted on my marine radio. I altered the marine radio antenna mounting - problem solved.

JDP