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@@ -259,10 +260,10 @@ Feel free to look at and make a copy of the [SparkFun example](https://docs.goog
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52mm off a professional mark is a clear indicator we are *very close* to the limit of our equipment. The sheer amount of geoscience, coordinate math, and relativistic physics that very smart people have contributed to enable any part of this experiment is awe-inspiring. It gave me great satisfaction and reassurance that our base at SparkFun HQ is set up well, and that, in the hands of a professional, the RTK product line is quite capable of providing *very* accurate readings.
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## How do I get 14mm?!
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## How do I get 10mm?!
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- Use the best equipment. Our mechanical setup was rickety and cheap. Use a surveyor’s bipod setup, with a bubble level, and a prism pole to accurately level the RTK receiver and measure the distance to the monument.
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- Use an antenna that is NGS calibrated to obtain accurate ARPs. The [SparkFun TOP106 antenna](https://www.sparkfun.com/products/17751) has been calibrated and we are in the process of calibrating the RTK Facet and RTK Facet L-Band.
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- Use an antenna that is NGS calibrated to obtain accurate ARPs. The [SparkFun SPK6618H antenna](https://www.sparkfun.com/gnss-multi-band-l1-l2-l5-surveying-antenna-tnc-spk6618h.html) has been calibrated and we are in the process of calibrating the RTK Facet and RTK Facet L-Band.
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- Use an accurate base. A temporary or ‘survey-in’ base will not be accurate. The base needs 24 hours of logging with a [PPP analysis](https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station/all#gather-raw-gnss-data).
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- Be within 10km of your base. A baseline that is more than 10km will introduce inaccuracies to the RTK fix readings.
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- Correction services are not as accurate as a fixed base. While services such as Skylark and PointPerfect are *convenient*, they use models to estimate the overall isotropic disturbance. A local, fixed base will outperform a correction service.
- Torch: [:material-radiobox-blank:{ .support-none }]( title ="Feature Not Supported" )
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@@ -191,7 +191,7 @@ Compatibility Icons
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</figcaption>
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</figure>
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Serial radios, sometimes called telemetry radios, provide what is essentially a serial cable between the base and rover devices. Transmission distance, frequency, maximum data rate, configurability, and price vary widely, but all behave functionally the same. SparkFun recommends the [HolyBro 100mW](https://www.sparkfun.com/products/19032) and the [SparkFun LoRaSerial 1W](https://www.sparkfun.com/products/19311) radios for RTK use.
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Serial radios, sometimes called telemetry or packet radios, provide what is essentially a serial cable between the base and rover devices. Transmission distance, frequency, maximum data rate, configurability, and price vary widely, but all behave functionally the same. SparkFun recommends the [HolyBro 100mW](https://www.sparkfun.com/products/19032) and the [SparkFun LoRaSerial 1W](https://www.sparkfun.com/products/19311) radios for RTK use.
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<figuremarkdown>
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Note: All SparkFun RTK devices contain a radio capable of direct Rover-Base communication over 2.4GHz called ESP-NOW. The RTK Torch is currently the only RTK device with a built-in Long Range (LoRa) radio.
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