[ntp:questions] GPS 18 LVC (Ground Wire Question)

Steve Kostecke kostecke at ntp.org
Mon Mar 15 15:20:17 UTC 2010


On 2010-03-15, Alby <google at empire.org> wrote:

> I'm attempting to build my own Stratum-1 Server using a Garmin GPS 18
> LVC.
> After splicing out the wires, I have the following:
>
> Thin Yellow Wire
> Thin White Wire
> Thin Green Wire
> (2) Thin Black Wires
> Thick Black Wire
> Thick Red Wire
>
>  My question is based on the (2) Thin Black Wires. Why do I have 2
> thin black wires and not (1) thin black wire?

The GPS18 pinout is documented on page 14 of
http://www8.garmin.com/manuals/425_TechnicalSpecification.pdf

GPS 18 LVC & GPS 18-5Hz PINOUT
 GPS 18 Pin #  Color           Signal Name         Wire Gauge
      1        Yellow     Measurement Pulse Output     28
      2         Red                 Vin                26
      3        Black              Ground               28
      4        White           Transmit Data           28
      5        Black              Ground               26
      6        Green           Receive Data            28

The GPS18x pinout is documented on page 12 of
http://www8.garmin.com/manuals/GPS18x_TechnicalSpecifications.pdf

2.1 GPS 18x LVC & GPS 18x -5Hz PINOUT
     GPS 18x Pin   Color               Signal Name          Wire Gauge
          #
          1        Yellow         Measurement Pulse Output       28
          2         Red                     Vin                  26
          3        Black                  Ground                 28
          4        White               Transmit Data             28
          5        Black                  Ground                 26
          6        Green               Receive Data              28

> Should I splice both thin black wires together and use them a 1 wire?
> Or does each thin black wire serve a purpose and I need to figure out
> which one is Ground and which one the other is used for?

Based on the pinout information shown in the GPS18/18x manuals the black
wires are all ground wires. If you're not sure about this you should
check with Garmin Support:

http://www.garmin.com/garmin/cms/home/support/supportcontact

-- 
Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/




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