DIY GPS Puck for Uniden Homepatrol Scanners

Yes Uniden makes a GPS kit for their scanners.  It’s $80.  You can DIY one up for less than half the cost.  And it’s fun to make your own stuff and you’ll learn a thing or two as well.

Here’s what you need.

  • GPS Puck – I used a GlobalSat BR-355S4 $35 approx
  • USB cable – USB A to USB Mini Type B (4pin) $4.50.  You will not walk in a store and find one of these. They are just a little hard to find.  I used a Promaster #3696 cable.
  • Skillz – Mad Skillz

Promaster #3696

Cut the data cable in half and strip both ends.  The cable wire color codes are standard for this kind of cable.

  1. Red = Voltage +
  2. Black = Ground –
  3. White = Data Wire + (This is the Receive RX on the GPS)
  4. Green = Data Wire – (This is the Transmit TX on the GPS)

On the end that has the regular old ordinary USB connection we are all familiar with (USB A) you only need the red wire, and black wire.  Red for +5 volts, Black for ground

On the end that has the very bizarre choice of the Mini Type B 4 pin male you need the Red, White, and Black wires.

Cut the connector off of the GPS puck cable end. On the GPS puck you need all four wires.  Red, Black, White, Green.

Now wire it together like this.  Work across the rows (i.e. the green wire on the puck goes to the white wire on the serial cable to the scanner)

GPS PUCK WIRES4 PIN CONNECTOR TO SCANNERUSB A POWER 
GREENWHITEData wires
WHITEBLACKData wires
BLACK REDBLACKGround
REDRED+5 v

And then test it before you solder and clean up the connections.

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