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Designed and manufactured in Boulder, Colorado, USA, the SparkFun RTK mosaic-T is the perfect solution for your high-precision timing needs. Based around the multi-constellation, multi-frequency, L5-ready mosaic-T from Septentrio, this is our most accurate GNSS timing product to date. It features a disciplined 10MHz Digitally-Controlled Temperature-Controlled Crystal Oscillator (DCTCXO). The mosaic-T also has built-in on-module support for the Fugro AtomiChron L-band timing service.
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Designed and manufactured in Boulder, Colorado, USA, the SparkFun GPS Disciplined Oscillator (GPSDO) is the perfect solution for your high-precision timing needs. Based around the multi-constellation, multi-frequency, L5-ready mosaic-T from Septentrio, this is our most accurate GNSS timing product to date. It features a disciplined 10MHz Digitally-Controlled Temperature-Controlled Crystal Oscillator (DCTCXO). The mosaic-T also has built-in on-module support for the Fugro AtomiChron L-band timing service.
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* SMA Connections:
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* GNSS Antenna (L1/L2/L5/L-Band) - provides 5V for an active antenna
* CTS can be configured as a 3.3V / 5V power output via a solder jumper
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*EventA & EventB inputs - 3.3V / 5V switchable
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*Pulse-Per-Second output - 3.3V / 5V switchable
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* EventB input - 3.3V / 5V switchable
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*Secondary I<sup>2</sup>C bus (SCL and SDA) - 3.3V / 5V switchable
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* Power Options:
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* USB-C
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* Power-over-Ethernet (PoE)
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* 9V-36V DC input (fully isolated)
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Under the hood, the RTK mosaic-T is based on the mosaic-T GNSS module from Septentrio, plus the Espressif ESP32-WROVER processor (16MB flash, 8MB PSRAM). The mosaic-T has USB-C connectivity (with Ethernet-over-USB), multiple UARTs and supports full Ethernet connectivity. You can connect the mosaic-T directly to your Ethernet network - our product supports Power-over-Ethernet too. The ESP32 rides shotgun: disciplining the DCTCXO and controlling the OLED display. The RTK mosaic-T has multiple power options including USB-C, PoE and 9V-36V DC, making it easy to connect it to a battery-backed supply.
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Under the hood, the GPSDO is based on the mosaic-T GNSS module from Septentrio, plus the Espressif ESP32-WROVER processor (16MB flash, 8MB PSRAM). The mosaic-T has USB-C connectivity (with Ethernet-over-USB), multiple UARTs and supports full Ethernet connectivity. You can connect the mosaic-T directly to your Ethernet network - our product supports Power-over-Ethernet too. The ESP32 rides shotgun: disciplining the DCTCXO and controlling the OLED display. Remote configuration is possible, the ESP32 console can be accessed via TCP. The GPSDO has multiple power options including USB-C, PoE and 9V-36V DC, making it easy to connect it to a battery-backed supply.
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RTK Base
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--------------
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Documentation
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--------------
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***[Product Manual](http://docs.sparkfun.com/SparkFun_RTK_mosaic-T/)** - Product manual for the RTK mosaic-T hosted by GitHub pages.<br>
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***[Product Manual](http://docs.sparkfun.com/SparkFun_GPSDO/)** - Product manual for the GPSDO hosted by GitHub pages.<br>
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[](https://squidfunk.github.io/mkdocs-material/)[](https://github.com/sparkfun/SparkFun_RTK_mosaic-T/actions/workflows/mkdocs.yml)
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***[/Front_Sticker](/Front_Sticker/)** - DXF and PDF files for the front sticker
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***[/Rear_Sticker](/Rear_Sticker/)** - DXF and PDF files for the rear sticker
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***[/Firmware](/Firmware/)** - Arduino source code and binaries for the firmware which runs on the ESP32-WROVER
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***[/Test_Sketches](/Test_Sketches/)** - Additional code used to validate and test the RTK mosaic-T
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***[/Test_Sketches](/Test_Sketches/)** - Additional code used to validate and test the GPSDO
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***[/Documents](/Documents/)** - Component datasheets etc.
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icon: material/video-input-antenna
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---
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The RTK mosaic-T is L5-capable but, because the GPS L5 service is currently pre-operational and marked as "unhealthy", it takes some extra configuration steps to enable L5:
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The mosaic-T is L5-capable but, because the GPS L5 service is currently pre-operational and marked as "unhealthy", it takes some extra configuration steps to enable L5:
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---
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!!! warning
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When assembling the RTK mosaic-T, users should attach any power connections last. While there shouldn't be any issues with hot-swapping peripherals, it is common practice to power electronics as the last step of the assembly process *(and the power should be disconnected before removing components)*.
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When assembling the GPSDO, users should attach any power connections last. While there shouldn't be any issues with hot-swapping peripherals, it is common practice to power electronics as the last step of the assembly process *(and the power should be disconnected before removing components)*.
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??? info "What is in the Box?"
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The RTK mosaic-T comes packaged as a complete kit, with all the accessories you'd need to set it up.
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The GPSDO comes packaged as a complete kit, with all the accessories you'd need to set it up.
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<figure markdown>
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[{ width="300" }](https://cdn.sparkfun.com//assets/parts/2/4/0/7/2/23748-RTK-Mosaic-X5-Kit-All-Feature.jpg "Click to enlarge")
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<figcaption markdown>
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Everything that is included in the RTK mosaic-T kit.
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Everything that is included in the GPSDO kit.
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</figcaption>
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</figure>
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Inside the box, users will find the [GNSS antenna](https://www.sparkfun.com/products/21801), RTK mosaic-T in its aluminum enclosure, and another box containing additional accessories. Inside, the accessory box, users will find the [CAT-6 Ethernet cable](https://www.sparkfun.com/products/8915), [USB cable](https://www.sparkfun.com/products/15424), [SMA to TNC cable](https://www.sparkfun.com/products/21740), [USB power supply](https://www.sparkfun.com/products/11456), [WiFi antenna](https://www.sparkfun.com/products/145), and [32GB SD card](https://www.sparkfun.com/products/19041).
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Inside the box, users will find the [GNSS antenna](https://www.sparkfun.com/products/21801), GPSDO in its aluminum enclosure, and another box containing additional accessories. Inside, the accessory box, users will find the [CAT-6 Ethernet cable](https://www.sparkfun.com/products/8915), [USB cable](https://www.sparkfun.com/products/15424), [SMA to TNC cable](https://www.sparkfun.com/products/21740), [USB power supply](https://www.sparkfun.com/products/11456) and [32GB SD card](https://www.sparkfun.com/products/19041).
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<div class="grid" markdown>
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<figure markdown>
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[{ width="300" }](./assets/img/hookup_guide/packaged_box.jpg "Click to enlarge")
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<figcaption markdown>
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The contents of the RTK mosaic-T package.
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The contents of the GPSDO package.
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</figcaption>
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</figure>
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## USB-C Ports
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The USB ports are utilized to configure the mosaic-T module and ESP32 firmware settings. Additionally, the USB ports can also be used as a power source for the RTK mosaic-T.
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The USB ports are utilized to configure the mosaic-T module and ESP32 firmware settings. Additionally, the USB ports can also be used as a power source for the GPSDO.
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<divclass="grid"markdown>
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-usb-mosaic.jpg"Click to enlarge")
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<figcaptionmarkdown>The RTK mosaic-T with USB-C cable being attached.</figcaption>
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<figcaptionmarkdown>The GPSDO with USB-C cable being attached.</figcaption>
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</figure>
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</div>
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-usb-esp32.jpg"Click to enlarge")
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<figcaptionmarkdown>The RTK mosaic-T with USB-C cable being attached.</figcaption>
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<figcaptionmarkdown>The GPSDO with USB-C cable being attached.</figcaption>
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</figure>
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</div>
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<divmarkdown>
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In order to receive [GNSS](https://en.wikipedia.org/wiki/Satellite_navigation"Global Navigation Satellite System") signals, users will need a compatible antenna. With the parts included in this kit, connect the L1/L2/L5 (tri-band) GNSS antenna to the RTK mosaic-T using the TNC-to-SMA cable.
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In order to receive [GNSS](https://en.wikipedia.org/wiki/Satellite_navigation"Global Navigation Satellite System") signals, users will need a compatible antenna. With the parts included in this kit, connect the L1/L2/L5 (tri-band) GNSS antenna to the GPSDO using the TNC-to-SMA cable.
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-gnss-tnc.jpg"Click to enlarge")
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<figcaptionmarkdown>Attaching a tri-band GNSS antenna to the TNC-SMA cable.</figcaption>
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</figure>
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-gnss_antenna.jpg"Click to enlarge")
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<figcaptionmarkdown>Attaching a TNC-SMA cable to the SMA connector on the RTK mosaic-T.</figcaption>
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[{ width="400" }](./assets/img/hookup_guide/assembly-gnss_antenna.jpg"Click to enlarge")
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<figcaptionmarkdown>Attaching a TNC-SMA cable to the SMA connector on the GPSDO.</figcaption>
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</figure>
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</div>
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Users should mount their GNSS antenna outside, where it will have a clear, unobstructed view of the sky. Avoid areas with nearby buildings, EMF structures (i.e. radio towers or power lines), and vegetation (i.e. trees). These objects can increase errors due to signal muti-path, interference, and elevated noise plane.
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<figure markdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-gnss-mount_location.jpg "Click to enlarge")
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[{ width="400" }](./assets/img/hookup_guide/assembly-gnss-mount_location.jpg "Click to enlarge")
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<figcaption markdown>The tri-band GPS antenna, mounted outside with an unobstructed view of the sky.</figcaption>
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</figure>
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??? tip "Connector Polarity"
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When selecting antennas and/or cables for the RTK mosaic-T, double-check the polarity of the connection.
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When selecting antennas and/or cables for the GPSDO, double-check the polarity of the connection.
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## Ethernet Jack
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There is a single ethernet jack on the RTK mosaic-T, which can be used to provide network access to the mosaic-T module. It supports [power over ethernet (PoE)](https://en.wikipedia.org/wiki/Power_over_Ethernet"PoE") to power the device.
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There is a single ethernet jack on the GPSDO, which can be used to provide network access to the mosaic-T module. It supports [power over ethernet (PoE)](https://en.wikipedia.org/wiki/Power_over_Ethernet"PoE") to power the device.
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The jack to the mosaic-T allows users to provide internet access and power; it supports [PoE](https://en.wikipedia.org/wiki/Power_over_Ethernet"Power over Ethernet"). To provide network access, users should connect the RTK mosaic-T from the `ETHERNET (PoE)` jack to their local network with the (CAT-6) ethernet cable provided in the kit.
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The jack to the mosaic-T allows users to provide internet access and power; it supports [PoE](https://en.wikipedia.org/wiki/Power_over_Ethernet"Power over Ethernet"). To provide network access, users should connect the GPSDO from the `ETHERNET (PoE)` jack to their local network with the (CAT-6) ethernet cable provided in the kit.
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* To power the device, a PoE network switch or PoE injector should be installed in between the network connection to the RTK mosaic-T.
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* To power the device, a PoE network switch or PoE injector should be installed in between the network connection to the GPSDO.
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-ethernet-mosaic.jpg"Click to enlarge")
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<figcaptionmarkdown>The RTK mosaic-T with ethernet cable being attached to the `ETHERNET (PoE)` jack.</figcaption>
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<figcaptionmarkdown>The GPSDO with ethernet cable being attached to the `ETHERNET (PoE)` jack.</figcaption>
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</figure>
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??? tip "Configuration: mosaic-T Settings"
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An µSD card slot is available for users to log and store data, locally on the board. Users will need to insert a compatible SD card and configure the mosaic-T module for data logging.
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-sd_card.jpg"Click to enlarge")
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<figcaptionmarkdown>Inserting an SD card into the RTK mosaic-T.</figcaption>
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[{ width="400" }](./assets/img/hookup_guide/assembly-sd_card.jpg"Click to enlarge")
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<figcaptionmarkdown>Inserting an SD card into the GPSDO.</figcaption>
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</figure>
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!!! info "SD Card Compatibility"
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## IO Terminals
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Users can easily attach accessories to the RTK mosaic-T by wiring them into the terminal blocks on the back of the enclosure.
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Users can easily attach accessories to the GPSDO by wiring them into the terminal blocks on the back of the enclosure.
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<figuremarkdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-terminal_block2.jpg"Click to enlarge")
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??? tip "Multiple Connections"
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For multiple connections or wiring harnesses, users can disconnect the terminal block from its socket on the RTK mosaic-T.
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For multiple connections or wiring harnesses, users can disconnect the terminal block from its socket on the GPSDO.
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<figure markdown>
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[{ width="400" }](https://cdn.sparkfun.com/assets/parts/2/2/5/2/5/22461-_PRT_10-Way_Terminal___Socket-_01.jpg "Click to enlarge")
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<figure markdown>
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[{ width="400" }](./assets/img/hookup_guide/assembly-terminal_block-attach.jpg "Click to enlarge")
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<figcaption markdown>Attaching the terminal block to its socket on the RTK mosaic-T.</figcaption>
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<figcaption markdown>Attaching the terminal block to its socket on the GPSDO.</figcaption>
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</figure>
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</div>
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</div>
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!!! warning
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To avoid shorts or damaging the RTK mosaic-T, verify the wiring with the labels on the back of the enclosure.
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To avoid shorts or damaging the GPSDO, verify the wiring with the labels on the back of the enclosure.
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