SparkFun

SparkPNT GNSS Disciplined Oscillator Plus

Name: SparkPNT GNSS Disciplined Oscillator Plus
Brand: SparkFun
SKU: SF-GPS-30777

· MPN: GPS-30777

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SparkPNT GNSSDO+ is a high-precision time and frequency reference built around the Septentrio mosaic-T GNSS module and a Rakon STP3593LF double-oven OCXO. It...

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SparkPNT GNSSDO+ is a high-precision time and frequency reference built around the Septentrio mosaic-T GNSS module and a Rakon STP3593LF double-oven OCXO. It is intended for demanding timing applications where stable 10MHz and pulse-per-second references are needed, including labs, server racks and remote equipment.

The mosaic-T provides multi-constellation, multi-frequency GNSS timing with AIM+ resilience for challenging conditions such as jamming or spoofing. The onboard ESP32-WROVER disciplines the OCXO and controls the Qwiic OLED display, while remote configuration is available through the ESP32 serial console over TCP.

Connectivity is practical and robust: the GNSS antenna, PPS output, disciplined 10MHz output and EventA input are all on SMA connectors, with additional IO on a 3.5mm cage-screw header. Power can come from USB-C, Power-over-Ethernet or an external DC source, and the unit is housed in a custom extruded aluminium case with machined end panels and slotted flanges for mounting.

The included active L1/L2/L5 antenna is certified by the National Geodetic Survey, and AtomiChron® service is delivered over-the-air using the same GNSS antenna with no internet access required. Supporting documentation and files include a quick start guide, schematic, product manual, hardware repository, ESP32 firmware and firmware binaries.

Features:

High-precision GNSS timing: Based on the Septentrio mosaic-T module.
Multi-constellation support: Uses all-constellation multi-frequency capabilities.
L1/L2/L5-ready: Designed for use with the included active L1/L2/L5 antenna.
AIM+ resilience: Helps maintain timing performance under GNSS jamming or spoofing conditions.
Disciplined OCXO: Uses the Rakon STP3593LF Double-Oven OCXO for clock stability, accuracy and holdover.
10MHz reference output: Provides a disciplined 10MHz output via SMA.
Pulse-per-second output: Provides a PPS output via SMA.
Event input: Provides an EventA input via SMA.
Multiple host interfaces: Includes USB-C with Ethernet-over-USB, multiple UARTs and full Ethernet connectivity.
Power-over-Ethernet: Can be connected directly to an Ethernet network with PoE support.
Remote configuration: Provides access to the internal ESP32 serial console via TCP.
Selectable IO voltage: IO voltage can be selected between 3.3V and 5V.
Serviceable storage: The microSD card edge protrudes slightly for easier removal and reinsertion.
Mountable enclosure: Custom extruded aluminium case with machined end panels and slotted flanges.
NGS-certified antenna: Included antenna has National Geodetic Survey certification.
AtomiChron® delivery: Delivered over-the-air using the supplied GNSS antenna, with no internet access required.
Not RTK-capable: The mosaic-T does not support RTK Rover, RTK Base or RTCM output operation.

Specifications:

GNSS module: Septentrio mosaic-T
GNSS capability: Multi-constellation, multi-frequency, L1/L2/L5-ready
Time pulse precision: 5ns
Time pulse precision with optional Fugro AtomiChron® subscription: better than 1 nanosecond
Event accuracy: better than 20ns
Processor: Espressif ESP32-WROVER
Flash: 16MB
PSRAM: 8MB
Oscillator: STP3593LF Double-Oven OCXO from Rakon
Oscillator family: ROX5242T1N Family
Disciplined oscillator output: 10MHz
Frequency calibration at 25°C: better than 50ppb
Frequency stability ageing: ±0.2ppb per day
Frequency stability with temperature: ±0.03ppb
Frequency stability temperature range: -32°C to +70°C
OCXO control: digital control via I²C
Allan Deviation with AtomiChron® enabled: below 1E-14 at 10000 seconds
mosaic-T USB connectivity: USB-C
USB networking: Ethernet-over-USB
UART connectivity: multiple UARTs
Ethernet connectivity: full Ethernet connectivity
Remote console access: internal ESP32 serial console via TCP
GNSS antenna connector: SMA
Pulse-Per-Second output connector: SMA
Disciplined 10MHz output connector: SMA
EventA input connector: SMA
IO connector: 3.5mm header with cage screw connections
Selectable IO voltage: 3.3V and 5V
Internal display: Qwiic OLED display
Power option: mosaic-T USB-C connection
Power option: ESP32 USB-C connection
Power-over-Ethernet input: 36V to 57V
External DC power source: between 9V and 36V
USB-C power adaptor: included 65W Power Delivery Wall Adapter
GNSS SMA antenna power: 3.3V
Included antenna: active L1/L2/L5 antenna
NGS antenna listing: SFESPK6618H
RTK support: not supported
RTK Rover configuration: not supported
RTK Base configuration: not supported
RTCM output: not supported

Use it where a stable GNSS-disciplined frequency reference is required, but note that it is a timing product rather than an RTK positioning receiver.

Jargon buster

Plain-language definitions for the technical terms used above.

ESP32: ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
GNSS: GNSS stands for Global Navigation Satellite System, covering positioning systems such as GPS and similar satellite networks. It matters here because high-precision GNSS modules can output lots of serial position data that this product can send wirelessly to a computer or phone.
L5: A modern GNSS signal band used by several satellite systems for more accurate and robust positioning. Dual-band receivers that include L5 can often perform better than single-band receivers, especially for RTK and areas with reflected signals.
microSD card: A microSD card is a small removable memory card used to store files such as audio tracks. For this product, the card is where the sound files live, so its capacity and formatting can affect how many sounds you can use.
OLED: OLED stands for organic light-emitting diode, a display type where each pixel produces its own light. It matters because OLED screens are thin, high-contrast and easy to read for small status displays, but they can be more sensitive to image burn-in than some other display types.
PoE: Power over Ethernet lets one Ethernet cable carry both network data and electrical power. This is useful when installing a device where running a separate power adaptor would be difficult.
Qwiic: Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
RTK: Real-Time Kinematic positioning is a GNSS technique that uses correction data from a base station to greatly improve location accuracy. It matters if you need centimetre-level positioning for robotics, mapping, surveying, or tracking rather than ordinary metre-level GPS accuracy.
SMA: A threaded coaxial connector commonly used for antennas. It matters because you need antennas with matching SMA connectors, or suitable adapters, for the LTE and GNSS antenna ports.
UART: UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
USB-C: A modern reversible USB connector used for power and data connections. On this product it matters because it can connect directly to a computer as well as to a microcontroller project.