To do this configuration, it is necessary to open the GPS160. It is recommended that this operation is only carried out by an approved Digital Yacht Dealer/Distributor, any physical damage to the PCB will not be covered by warranty.

 

Before opening the GPS160, turn off all DC power to the unit and then remove the threaded mount by unscrewing the 3xM3 hex bolts using a suitable Allen Key. Then using a Torx T6 screwdriver, remove the three screws that hold the GPS enclosure together. Gently pull the enclosure apart being careful not to lose the O-Ring seals (1 large outer and 3 small screw pillar O-Rings).

 

Once the GPS160 PCB is exposed, locate PL3 which is on the underside of the PCB (see below). It is possible using a pair of tweezers to carefully move the “Jumper” from the default NMEA position to the 1PPS position. The second image below shows what a “Jumper” looks like and how it hangs down on the connector.

Once the “jumper” has been moved to the 1PPS position, re-assemble the unit, wire the Blue wire to whatever device needs the 1PPS signal and power up the GPS160. As soon as the GPS160 gets a valid position fix, the 1PPS signal will start to be transmitted.

 

This is the output stage of the 1PPS circuit, note it has a 50mA PTC Fuse that offers some protection, but care should be taken connecting it to other devices.