Deere mRTK / Mobile RTK RTCM Corrections.....

[darrenjlobb]

Evening all...

As a long term open source GPS / Autosteer user in both my tractors, it pains me to have to post this, but anyway..

I have a Deere combine, which is factory autotrac ready, with yield monitor etc, so have always used a SF3000 reciever on SF1, which is more than enough accuracy for being in single fields in short periods in the combine and for the yield monitor etc..

However due to new 4g/5g signal interfearance issues, SF1 is no longer reliable... So I have aquired a reciever with both SF2 and RTK activations on it, and have put a m-RTK subsciption on it, in the hope I could send normal RTCM correction messages into its serial port (just like I do on my F9P setups in the tractors),to get an RTK fix, and therefore avoid the SF1 issues...

However having tried this, I cant seem to get it to get a fix... For testing i'm just using strsvr on a laptop as an ntrip client to my normal caster, and then outputting over serial, which I have hooked to the 4 pin deutch (the connector the stock deere RTK radio / modems connect to), which in turn is SF3000 pin 8 in the conncetor (RTK serial RX).

The data kb counter starts to increase in greenstar when i start sending corrections, but no sign of a fix.

Does anyone have any experiance with this? Im thinking maybe im missing a RTCM message, or sending messages it dosnt like, but cant find any useful documentation anywhere regarding what specific messages it requires... Most likely as they dont want you running your own non £££ paid for base stations!

If anyone has any experiance using m-rtk with a third party base station id love to hear...

Thanks!

 

[cquick]

I'm guessing you've already got over this hurdle if it's receiving corrections, but do you have "jdmrtk" somewhere in your caster address?
Another thought is maybe one of the descriptor messages needs to be something proprietary. What messages are you using, and does this correlate to JD's offering? Could there be a string in 1008 or 1013 that it's looking for?

 

[Northern farmer]

I'm guessing you've already got over this hurdle if it's receiving corrections, but do you have "jdmrtk" somewhere in your caster address?
Another thought is maybe one of the descriptor messages needs to be something proprietary. What messages are you using, and does this correlate to JD's offering? Could there be a string in 1008 or 1013 that it's looking for?

Do you mean RTCM 1033 instead of 1013?

I have no JD experience but been reading here success reports with the jdmrtk trick, no talks about any proprietary message. Wonder if it applies for older gear too.

 

[cquick]

Yeah I meant 1033!

 

[darrenjlobb]

So currently im not even trying to connet using the deere as ntrip client, Im just using my own ntrip client on laptop for testing (strsvr) and sending it straight into the serial input... (But yes you are correct, by creating a subdomain with jdmrtk.xxx. the deere screen allows you to connect then.
With regards to messages, I have tried all sorts, but this is really the main issue as I dont know what its expecting, and documentation is near enough non exisistent... Was really hoping I could find someone else with a working setup, or that pays for a jdmrtk sub, that could take a peak at the stream to see exctly what messages / format is being used...

 

[KerazyPete]

My RTKBase base station spits out the following RTCM messages which my two SF6000 RTK enabled receivers gladly listen to. No 'jdmrtk' subdomain, actually that's something new to me.

1004,1005(10),1006,1008(10),1012,1019,1020,1033(10),1042,1045,1046,1077,1087,1097,1107,1127,1230

This web page (translated from French) came in handy when configuring the receivers.

Hope that helps.

 

[Andy26]

This web page (translated from French) came in handy when configuring the receivers.

Just look at the different in ease of configuring a CNH versus John Deere.

 

[darrenjlobb]

My RTKBase base station spits out the following RTCM messages which my two SF6000 RTK enabled receivers gladly listen to. No 'jdmrtk' subdomain, actually that's something new to me.

1004,1005(10),1006,1008(10),1012,1019,1020,1033(10),1042,1045,1046,1077,1087,1097,1107,1127,1230

This web page (translated from French) came in handy when configuring the receivers.

Hope that helps.

Thanks for the reply,

Are these two SF6000 recievers both using a Deere 4g modem on the back of them? Or third party source / modem just connected to the seriel input?

Still got mixed inputs on wether or not the SF3000/6000 will actually listen to the serial input for correction if they cant see a proper deere modem connected...

 

[KerazyPete]

Correct, both receivers have the official John Deere LTE 4g modem bolted to the back. Below is how it is configured and what licenses are activated.
Note how there appears to be a separate RS232 Settings for the modem which appears to be configured, and the SF6000 receivers Serial Port which looks to be unconfigured.

 

[darrenjlobb]

I wonder if the issue is that the starfire units just ignore incoming serial RTCM data streams if its not connected / can see an "official deere modem".... Which may be why im not having much luck, but I have heard form others that it does work / have read stories of others using 3rd party radios, which again just input into the serial input, so I still want to think it is possible..

I have the same activations / mrtk subscription active, so should be good on that front...