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Northern Indiana | A few points to address here, been some good advice in this thread so far
The CRG is a pretty good receiver, but it seems like it is and always will be aftermarket solution with good and bad characteristics - a flexible RTK product but can have issues and just is not as reliable as OEM Deere StarFire receivers. Also, at least at this time, when you drop RTK you go to WAAS - not the case with Deere radio or cellular RTK. I am also not a fan of the Emlid products as permanent base stations, that's really not what they're made for. Something like a Novatel base station would be a much higher quality option.
A Deere base does not have to be high up, in fact I'm against high up bases as they tend to move in the wind and be in bad locations for GPS reception issues like shading and multi pathing off metal structures like bins and barns. A way to get around this is with a repeater mounted high and the base down lower. Any Deere dealer can program a 450 radio to be a repeater. It's hard to beat radio if your entire operation is within 12-20 miles of your base.
Yes, 450 requires an FCC license. Most any radio shop can help with this. Roecomm in Michigan has been a go-to source for FCC licensing, signal strength projection maps, etc for Deere dealers for a long time. They will also help consult for producers https://www.roecomm.com/. FCC fee less than a couple of hundred dollars per 5 years.
There are also other options to use cellular RTK with a Deere StarFire 7000/7500, as it will accept instusty standard RTCM3 RTK corrections with a permanent RTK license (what used to be called RTK Ready on 3000s and 6000s). OEM receiver and still having 14 days of RTK fallback while using free or low cost RTK corrections is an amazing combination.
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Agra-GPS
