"david" wrote in
:

it was good to see no negative comments about the JRC1000.
David


They're just hiding their true feelings....(c;

"david" wrote in message
...
Thankyou all for your help and advice a kind reader has sent me the manual
and I will mount it low as suggested.
it was good to see no negative comments about the JRC1000.
David


Several people have complained about the noise that the smaller JRC, Furuno,
etc., radars make when mounted directly on top of a thin fiberglass or metal
cabin roof. The roof/overhead tends to act as a acoustic diaphragm, making
the cabin noisy from drive motor/gear operation. The quick fix in most cases
is a very small amount of grease on the motor gear/ring gear teeth. Some
motors are shock mounted in rubber grommets, and permit loosening the
mounting bolt and tiny adjustment of the motor position can be done,
changing the depth of the gear teeth mesh, until a quiet point is found.
Possibly remounting the scanner dome on rubber or plastic washers would
reduce the noise also. Raymarine tends to use belt drive, so drive noise is
usually not a problem.
73
Doug K7ABX