Marine PC's & WIFI by IslandTime PC

The block diagram at the right shows shows the parts of a system.  Click on the diagram to see it full size.

The wiring consists of 1 run of UV rated Cat5 cable from the antenna to a dry location below below that has access to 12 volt power and a second run of indoor Cat5 cable (patch cable) that connects to the ships computer or wireless router. The 2 cable runs are connected by a POE (Power Over Ethernet) injector which allows 12 volt power to be sent up to the antenna.  
IslandTime HP Block Diagram

Cat5 (ethernet) cable consists of 4 pairs of 24 gauge wire. The outdoor cable uses solid copper conductors.  The Cat5 cable from the POE to the computer uses 24 gauge stranded wires. Both cables have RJ45 plugs on both ends and are terminated according to the EIA 568B standard shown at the right.

Cat5 cable is about .25" (6mm) in diameter but the plug requires a 9/16" (16mm) hole to pass through.  Cable clams such as those made by Blue Sea Systems are a good choice for passing cables through decks without cutting off plugs.

Where and how to mount your antenna is the main decision required in a system installation.   

Higher is always better for a Wifi antenna but there is a "law of dimensioning returns" working here.  For all the effort involved in placing the antenna at the top of your mast you may find that your neighbor with his antenna mounted on his radar arch can make the same connection that you have 90-95% of the time.

The base of the antenna should be at least 10-12 feet (3m) off the water for best performance and the antenna should have a 360 degree view of the horizon.  You don't need to be concerned about masts and poles unless you are within a few feet of them.  Other antennas such as VHF or GPS antennas will not cause any problems.

IslandTime has 2 systems available which provide different mounting options. 

The Standard System has an antenna with a built-in aluminum bracket that will allow u-bolting to vertical poles between 1.25" and 2" in diameter or bolting to vertical surfaces.

The In-Line system uses a PVC tube with 1"-14 threads at the base to mount the antenna on a standard, 1"-14 thread marine antenna mount such as those shown at the right.


IslandTime PC * 243 W. Orange Ave. * Wewahitchka, FL 32465 * USA