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Southern Illinois | I've set up a network over part of the state of Il.
For a single base are you going to operate 40 miles from your base location or you are spread that far around? With a Trimble and using GPS and GLONASS corrections you can expect to see 2.5" horizontal best case at 30 miles. Now this will remain repeatable year to year. The best case is dependent on the quality of the base.
You need a static IP from your internet provider. You can use a free Caster program like BKG's or Lefebure's. These will run single baseline data. You need a base capable receiver. It is possible with some work and free software to use something as simple as a commercial unit like an AgLeader 6500 or Novatel SmartL-6 and connect it to the computer. However using a survey grade antenna mounted to your house and coax to the receiver is better. Once you figure out how you want the base you just set up your rover to log into your static IP and run. You will want to use a router as a firewall. Routers will let you configure any port number to be passed directly to a computer on the inside.
For best results read the tech specs on your prospective base. I only use OEM modules that measure the satellite range to 1mm or better. Digi can not do this because the absolute best base the plug in their system are CHC. These use Trimble OEM boards on the inside witch can do about 2mm best case. They also are rated 1 sigma which means they will output data with 68% accuracy. I use 3 sigma receivers which only output corrections for a sat if it passes 99% accuracy.
You can buy many survey grade antennas. Most are actually made by one company. If you go with old tech base units you may want a choke ring added to it but that will add a couple of thousand dollars. Modern tech can take out multipath to where even government agencies measuring tectonic plates movements with bases do not bother with buying choke rings anymore. A all system all frequency survey antenna will cost you around $800.
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