Hardware Assembly

Important: Read Before Use!

ESD Sensitivity

The mosaic-G5 P3 GNSS receiver is sensitive to ESD. Use a proper grounding system to make sure that the working surface and the components are at the same electric potential.

Info

As recommended by the manufacturer, we highly recommend that users take the necessary precautions to avoid damaging their GNSS receiver.

The All-band GNSS RTK breakout board features ESD protection on the USB-C connector and breakout's I/O:
- USB data lines
- I/O PTH pads
- JST connector and BlueSMiRF header pins
The mosaic-G5 P3 GNSS receiver features internal ESD protection to the ANT_1 antenna input.

Active Antenna

Never inject an external DC voltage into the SMA connector for the GNSS antenna, as it may damage the mosaic-G5 P3 GNSS receiver. For instance, when using a splitter to distribute the antenna signal to several GNSS receivers, make sure that no more than one output of the splitter passes DC. Use DC-blocks otherwise.

USB Programming

The USB connection is utilized for programming and serial communication. Users only need to plug their All-band GNSS RTK breakout board into a computer using a USB-C cable.

All-band GNSS RTK breakout board USB connection — The All-band GNSS RTK breakout board with a USB-C cable attached.

Info

Once connected to a computer, the mosaic-G5 P3 module emulates two virtual COM ports. These can be used as standard COM ports to communicate with the GNSS receiver.

GNSS Antenna

In order to receive GNSS signals, users will need to connect a compatible antenna. For the best performance, we recommend users choose an active, L1/L2/L5/L6 GNSS antenna and utilize a low-loss cable.

All-band GNSS RTK breakout board antenna connector — Attaching a GNSS antenna to the SMA connector on the All-band GNSS RTK breakout board.

Active Antenna

Never inject an external DC voltage into the SMA connector for the GNSS antenna, as it may damage the mosaic-G5 P3 GNSS receiver. For instance, when using a splitter to distribute the antenna signal to several GNSS receivers, make sure that no more than one output of the splitter passes DC. Use DC-blocks otherwise.

Tip

Don't forget that GNSS signals are fairly weak and can't penetrate buildings or dense vegetation. The GNSS antenna should have an unobstructed view of the sky.

JST Connector

The JST connector on the All-band GNSS RTK board, breaks out the COM2 UART port of the mosaic-G5 P3 GNSS receiver. In most circumstances, users will utilize the JST connector to interface with one of our radio transceivers for RTK correction data.

Pin Connections

When connecting the All-band GNSS RTK breakout board to our radios, only the RX, TX, and GND connections are required as outlined in the table below. By default, flow control is disabled on the mosaic-G5 P3 GNSS receiver and the connections are not available through the JST connector.

Board	RX	TX	GND
Radio	TX	RX	GND

All-band GNSS RTK Breakout Board

When connecting the All-band GNSS RTK breakout board to other products, users need to be aware of the pin connections between the devices. and voltage ranges of the products. Below, is a table of the pin connections for the JST connector on the All-band GNSS RTK breakout board.

JST pins — The pin connections of the JST connector.

Pin Number	1 (Left Side)	2	3	4 (Right Side)
Label	`+`	`T`	`R`	`-`
Function	Voltage Output - Default: 3.3V - Selectable: 3.3V or 5V	`UART2` - Transmit	`UART2` - Receive	Ground

VSEL Pin

By default, the power pin (i.e. + or Pin 1) of the JST connector is connected to 3.3V and configured as a power output. An input voltage can be supplied through the pin; however, users should be mindful of any voltage contention issues.

Jumper

By default, the VSEL jumper is connected to 3V3 pad for a regulated 3.3V output. However, users can modify the jumper to utilize the voltage supplied from either the USB or VIN inputs.

LoRa Radios

As documented in the LoRaSerial product manual, the pin connections between a host system (i.e. All-band GNSS RTK breakout board) and the LoRaSerial Kit radio is outlined in the image below.

Flow Control — The connections for the LoRaSerial radio to a host system.

Below, is a table of the pin connections for the JST connector on our radios.

Pin Number	1 (Left Side)	2	3	4	5	6 (Right)
Label	5V	RX - SiK RXI - LoRaSerial	TX - SiK TXO - LoRaSerial	CTS	RTS	GND
Function	Voltage Input - SiK: 5V - LoRaSerial: 3.3 to 5V	UART - Receive	UART - Transmit	Flow Control Clear-to-Send	Flow Control Ready-to-Send	Ground

Breakout Pins

The PTH pins on the All-band GNSS RTK board are broken out into 0.1"-spaced pins on the outer edges of the board.

New to soldering?

If you have never soldered before or need a quick refresher, check out our How to Solder: Through-Hole Soldering guide.

How to Solder: Through-Hole Soldering

Headers

When selecting headers, be sure you are aware of the functionality you require.

Hookup Wires

For a more permanent connection, users can solder wires directly to the board.

Soldering wires to the All-band GNSS RTK breakout board.

BlueSMiRF Header

To pair the All-band GNSS RTK breakout board with a mobile device, users will need to connect a BlueSMiRF v2 to the available header pins.

Connecting a BlueSMiRF v2 to female headers soldered on the All-band GNSS RTK breakout board.