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Discussion Starter #1
Hi!

I am new to AgOpenGPS and the Combine Forum. I looking to setup AOG and AOG Autosteer. I was wondering if this Trimble DGPS Receiver (The link didn't work, so search ebay for this listing number: 173899691130) would work with AOG. The manual reads: NMEA-0183 output to external NMEA devices (supported messages are ALM, GGA, GLL, GSA, GSV, VTG, and ZDA).

Thanks in advance for any help and/or advice!
 

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https://www.ebay.ca/itm/Trimble-DGPS-GPS-Receiver-V1-70-P-N-46090-11-W-Antenna-and-case/173899691130?hash=item287d3ab47a:g:v2UAAOSw~plc1mdF

I think that would be the link.

I looked quickly for the manual and could not find it. As long as it outputs nmea messages it will work, but...
Depending on what you want to do with aog there are a few things to consider.
If you want to just do light bar guidance and mapping a gps that has a refresh rate of 5hz and a connection speed to the computer of 19200baud you will be good. My limited experience with older survey gps systems is that is all they are capable of since they are not mapping moving equipment.
If you want to do autosteer I highly recommend a rtk system with a 10 hz update rate. Lets face it, aog and all other systems depend on a good gps position. I think I still have a lump on the side of my head from loosing rtk at 13mph and the sprayer trying to hit the "new" position. Not to mention it is also harder to tune aog if your location keeps moving.
 

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Discussion Starter #3
Thanks for that info!

So could point me in the direction of a GPS Receiver that would be better suited to to my application and work with AgOpenGPS and AOG Auto-steer. (My budget is $200, I am just looking for something to mess around with and get comfortable with AOG before I upgrade.)

Again, thanks for the advice!
 

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https://store.emlid.com/product/reachm-plus/

It is a bit more than your budget and you still have to buy a good antenna. Those little puck style one are pretty poor. So add about a 100 bucks for an antenna(which I still need one more). On the plus side of going this way you can get rtk corrections by using a service like rtk2go and your hotspot on the phone.
For really cheap and testing purposes something like this will work, but probably not very well for autosteer.
https://www.aliexpress.com/item/GPS-receiver-USB-driver-4M-FLASH-NMEA-0183-9600-bps-BS-72U-laptop-replace-SIRF-IV/33025889469.html?spm=2114.search0104.3.85.7a464119cToXtT&ws_ab_test=searchweb0_0,searchweb201602_6_10065_10068_10130_10547_319_10059_10884_317_10548_10887_10696_321_322_10084_453_10083_454_10103_10618_10307_537_536,searchweb201603_53,ppcSwitch_0&algo_expid=e476c021-b5af-4742-87ae-90eb95ba3aa1-15&algo_pvid=e476c021-b5af-4742-87ae-90eb95ba3aa1
There is also a simulator to get used to aog. Read through the rtk on a budget thread. Some ideas there too.
 

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Not sure where you're at, you're level of refinement vs willingness to tinker and if any correction signals are available.

Overall, if you're comfortable with a bit of web searching and following instructions to setup, I'd suggest an F9P based unit such as:
May be a little over you're budget, but they are rick slid RTK units when provided with correction signals.


https://www.digikey.com/product-detail/en/u-blox-america-inc/C099-F9P-2/672-1110-ND/9817935&?gclid=Cj0KCQjwrdjnBRDXARIsAEcE5YmfM-Cm4UNb96LNq0SoIUS9_a8N4UkYERFE03Dg7GBf6D0Evda8dg8aAohGEALw_wcB
or
https://www.ardusimple.com/product/simplertk2b-basic-starter-kit-ip65/
 

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Jb1, are those puck antennas that come with the f9p any good? I am guessing you still have to have a good ground plane. Or is a guy still in need of a better one?
 

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The F9P boards aren't exactly turn-key though. Emlid is releasing a F9P version of their nice rugged, self-contained units, but of course the price will be an order of magnitude more than the $200 he wants to spend.

Yes the antennas work best when they are stuck on a metal plate for a ground plane. But they work well enough without. I am currently using them without. I'm using the uBlox antennas that Ardusimple is now shipping standard.

For experimentation purposes, any GPS receiver that can output serial NMEA strings will get you started at least. Even if it's not RTK.
 

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Hi, similar question: I'm looking at just using AOG as a lightbar for now but maybe autosteer in the future. If I got the Ardusimple kit linked above how accurate is it without RTK? Does it get WAAS and be accurate to 6 to 8 inches like a Trimble AG15 antenna is advertised. Thanks for all the knowledge shared on this site about more affordable guidance systems.
 

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Discussion Starter #9
Thanks JB_1 and Torriem.

I was able to pick up a Trimble system for $75 total on ebay with Differential GPS, 5HZ refresh rate and claimed +/- 5cm accuracy to boot. In the future, when I implement autosteer, I think I will try building my own rtk receiver as described in the AOG wiki agopengps.gh-ortner.com/doku.php?id=gps:start Has any one had luck using this with autosteer or are there better options available for the price?
 

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Hi, similar question: I'm looking at just using AOG as a lightbar for now but maybe autosteer in the future. If I got the Ardusimple kit linked above how accurate is it without RTK? Does it get WAAS and be accurate to 6 to 8 inches like a Trimble AG15 antenna is advertised. Thanks for all the knowledge shared on this site about more affordable guidance systems.
No the Ardusimple uses the ZED-F9P which does not support SBAS systems like WAAS. So accuracy on their own is no better than 1.5 metres or worse. ZED-F9Ps are really designed for use in an RTK system, correcting with observations from a nearby base station.
 

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Just FYI, I learned today that the uBlox ANN-MB antennas that go good with the F9P require a ground plane. I needed to do some surveying and the Reach RS+ was just not working, so I jury rigged up one of my F9P boards on my laptop over usb with some Linux scripting duct tape and was very frustrated trying to get an RTK fix util I figured that out. Used a small piece of metal and suddenly it was working very well.
 

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I've been happy with the Antennas. I've planted 100 acres with them this spring across about 10 small fields (biggest field is 20 acres, smallest is 1.5) that have treelines or woods at the boundaries with no issues. Very few times does it drop to RTK Float. In comparison, the emlid reach would be in float about 40% of the time.

The C099 kit comes with a small ground plane disk as part of the kit. It's about a 100 cm diameter small piece of metal. The antennas have a magnet in them. I actually use a 6" stainless cover plate as my ground plane:
https://www.amazon.com/Oatey-42783-Stainless-Steel-6-Inch/dp/B0069L2MV4


Jb1, are those puck antennas that come with the f9p any good? I am guessing you still have to have a good ground plane. Or is a guy still in need of a better one?
 
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