Excerpted from the earlier discussion “Furno Radar Install” at:
Furno Radar Install
Radar Scanner Cable Splices:
The problems associated with scanner cable splices are legion, even tho’ subtle. Perhaps Rick
(and now EngNate) might elaborate.
Unshielded terminal strips are likely to create problems with signal loss, timing delay, signal interference, and/or EMI radiation.
There are (a dozen or so) small wires, difficult to work with, and it’s difficult to keep untwisted and/or unshielded lengths to minimum, while spreading out to mate on terminals.
I’d (when practicable) prefer to use a proper, weather-proofed, barrel-type locking, shielded plug set, comparable to the OEM set supplied with the cable - or a manufacturer’s cable extension set.
Junction Box Splice Cautions:
1. Screened conductors: The screen or drain shield must be spliced adjacent to it’s core conductor, and the unscreened length of core kept to a minimum (<1.25").
2. Connect all power, data, & co-ax cables in the same sequence (on terminal strip) as used for manufacturer’s connector or terminal. Send & receive conductors will normally be adjacent to each other.
3. Small conductors: Take extraordinary care not to damage very small conductors.
4. Ferrites: Most manufacturers will recommend a specific ferrite bead, to be installed on each end of the splice.
Protection: Protect all cables from moisture, UV & weather exposure, mechanical abrasion, heat, etc. Avoid tight bends.
I’m certain Furuno provides cable length, connection & splicing cautions & instructions in their manual.