> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # SparkFun RTK Express Kit **Type:** Product page · **SKU:** GPS-18380 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia) **Page:** https://core-electronics.com.au/sparkfun-rtk-express-kit.html ([markdown](https://core-electronics.com.au/sparkfun-rtk-express-kit.html.md)) The RTK Express Kit has everything you need to get centimeter level global positioning measurements using GNSS RTK. We've created a handy carrying case to... ## Pricing - **Price:** $1,189.95 (inc GST) — $1,081.77 AUD, exc GST - **Quantity discounts:** 5+ $1049.32 (exc GST) · 25+ $1027.68 (exc GST) · 100+ $984.41 (exc GST) ## Availability & dispatch - Out of stock — the product page offers email notification when it returns. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GPS-18380:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/GPS-18380:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description The RTK Express Kit has everything you need to get centimeter level global positioning measurements using GNSS RTK. We've created a handy carrying case to protect the most expensive bits, allowing you to quickly attach the L1/L2 antenna and RTK Express housing to the pole or tripod of your choice. The kit includes all the antenna bits, cables and chargers you need to jump right into the field. The [RTK Express](https://core-electronics.com.au/search/?q=18442) is a Bluetooth enabled multi-band GNSS receiver based on the ESP32 from Espressif and the ZED-F9P from u-blox. Power it up and you'll have 300mm approximate accuracy out of the box and 18mm accuracy with RTCM corrections. This kit provides the L1/L2 antenna, adapters, interface cables, and chargers needed for general GNSS use. We generally recommend using your cellular phone as the radio back haul for RTCM but if you prefer to use radios, these [Serial Telemetry radios](https://core-electronics.com.au/sik-telemetry-radio-v3-915mhz-100mw.html) can to be purchased separately. You can also use your own, higher power radios as long as they support 57600bps. Sparkfun also recommend logging all data to your phone over Bluetooth. This is as simple as checking a box within SW Maps. But if you prefer to do long surveys, or need to deal with RAWX measurements where a phone will not be present, a microSD card should be purchased (any size up to 32GB). Please keep in mind that you will need to provide your own mono-pod or tri-pod as well as a cell-phone type holder for securing the RTK Express to your mono-pod or tri-pod. We've found [this style clamp](https://www.amazon.com/gp/product/B072DSRF3J) and [this style clamp](https://www.amazon.com/gp/product/B07VF4H6KW) work well. Your mileage may vary. **Note:** The L1/L2 antenna has a 5/8" thread which will fit most surveying platforms. The kit includes a 5/8" to 1/4" adapter as well which will fit most camera mono-pods and tri-pods. You may need additional adapters for your specific equipment. **GNSS Receiver: ZED-F9P** - Concurrent reception of GPS, GLONASS, Galileo and BeiDou - Receives both L1C/A and L2C bands - Current: 68mA - 130mA (varies with constellations and tracking state) - Time to First Fix: 25s (cold), 2s (hot) - Max Navigation Rate: - PVT (basic location over UBX binary protocol) - 25Hz - RTK - 20Hz - Raw - 25Hz - Horizontal Position Accuracy: - 2.5m without RTK - 0.010m with RTK - Max Altitude: 50km (31 miles) - Max Velocity: 500m/s (1118mph) **Bluetooth® Transceiver: ESP32 WROOM** - Xtensa® dual-core 32-bit LX6 microprocessor - Up to 240MHz clock frequency - 4MB of flash storage - 520kB internal SRAM - Integrated 802.11 BGN WiFi transceiver - Integrated dual-mode Bluetooth® (classic and BLE) - Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096) - 2.5 µA deep sleep current **Overall Device** - Internal Battery: LiPo 1300mAh with 500mA charging - Radio Port: 3.3V TTL Serial (57600bps RTCM TX/RX) - Data Port: 3.3V TTL Serial (115200bps NMEA) - Embedded OLED Display for available satellites, data logging, and more. - Push button controls - Weight: 162g (entire device including battery) - Dimensions: 132mm x 101mm x 32mm (5.2in x 3.9in x 1.2in) - 1x [Qwiic](https://www.sparkfun.com/qwiic) Connector **GNSS Multi-Band L1/L2 Surveying Antenna** - Gain: =5dBi - LNA Gain: 40dB - Reception Frequencies - L1: 1555 to 1615MHz - L2: 1198 to 1278MHz - 50 Ohm Antenna Impedance - Overall antenna weight: 335g - Bare antenna element weight (including MMCX connector, with RF shield): 160g - Dimensions: 148 x 55mm - Waterproof IP67 - Connector: Female TNC Documents - [RTK Express Schematic](https://core-electronics.com.au/attachments/localcontent/SparkFun_RTK_Express_-_Schematic_226402c5a1d.pdf) - [RTK Express Hookup Guide](https://learn.sparkfun.com/tutorials/1857) - [TOP106 GNSS L1/L2 Multiband Antenna](https://core-electronics.com.au/attachments/localcontent/TOP106_GNSS_Antenna_946868792b1.pdf) - [RTK Express Firmware Repo](https://github.com/sparkfun/SparkFun_RTK_Firmware) - [RTK Express Hardware Repo](https://github.com/sparkfun/SparkFun_RTK_Express) - Certified OSHW: US002050 [![alt text](https://core-electronics.com.au/attachments/localcontent/OSHW_Certification_2050_20218c079e5.jpg)](https://core-electronics.com.au/attachments/localcontent/OSHW_Certification_2050_20218c079e5.jpg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_3354.jpg)