Installing and using external 4G and GPS antennas on the AutoPi TMU

This is a step-by-step guide on how to install external 4G and GPS antennas on your AutoPi.

This guide will require a medium level of DIY abilities/skills, and it will envolve drilling into the plastic casing of the AutoPi TMU.

Step 1: First, you will have to make sure that you have access to the following:

  • The External Antenna Kit
  • AutoPi TMU 3rd Gen
  • A drill

Step 2: Disassemble the device by opening the four screws located on the backside.

Step 3: Turn the device around and lift the top part while being careful not to damage the antenna cable.

Step 4: Remove the black antenna cable by pulling straight up, while being careful not to damage the modem.

Step 5: Hold the OBD connector and lift the device slowly out of the enclosure.

BE CAREFUL: as the speaker and the battery are connected still to the device and the enclosure.

Step 6: Remove the speaker and the battery connector, while keeping in mind the location of the connectors.

Step 7: Now that you have separated the enclosure from the device, you will see that there are dots located around the casing. These dots show placement location for possible antennas.

Please note: there are 5 possible locations on the side opposite to the OBD port, and 1 on each side of the device.

Step 8: To drill, use a 6.5 mm drill bit, and drill directly on top of the dots.

Step 9: After drilling, insert the SMA cables through the holes you have created.

Step 10: Next, we are starting the reassembly process. First the battery and speaker will be connected, then the device will be slowly put in the enclosure, while being very careful not to pinch any wires.

Step 11: The next step is to reconnect the SMA cable to the modem by positioning them above the connector and pushing down gently until a click is heard. Please keep in mind that the GPS SMA cable will be in the middle of the three connectors. In the picture below, the GPS antenna is the GRAY SMA cable.

Step 12: The top lid of the enclosure will be mounted using the 4 black screws.

Step 13: Next, the antennas will be connected to the SMA cables, while keeping in mind not to mix the GPS antenna with the 4G antenna.

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I need more clarity here. Which one is the GPS cable and which one is the 4G? The illustration is showing 3 antenna connections?

I believe the middle one is meant for GPS. I’ve just taken my previous gen AutoPi apart and the grey cable connects to GPS antenna.

Hello James,

In step 11 you will see where the GPS antenna should go.

The GPS antenna is the grey one and it goes in the middle,while the 4g ones go on the sides.

Let us know if you have any questions.