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Thread: Trimble 750 VRS

  1. #1
    Ujay
    Guest

    Trimble 750 VRS

    Trimble 750 VRS

    Having trouble with the VRS side of things, keeps logging out. Works OK for an hour or two then slams out, if turn 750 off and switch on again works for 10 minutes then slams out again. Then might be OK for an hour then out again, then another day OK.

    From what found out at moment and info got seems could be a software problem, people spoke to, not too sure what it is. I am using the earlier type modem 3000 that I hear is more stable than the latest modem.

    Status Box –GPS source RTK VRS

    GPS Status DGPS ( Egnos)

    Sats 11 ( hdop =0.8 )

    On bottom of screen when cuts out say’s

    VRS Login session Dropped, cannot engage , position Quality.

    VRS Error Disconnected Authentication.

    I am not having much luck with the 750’s I have 2 units, one has been replaced 3 times for different faults, the other one has a long on going fault that might have to be replaced if cannot fix it.

    I do have faith that Trimble will sort out these anomalies, but it is annoying when spent a lot of money to not being able to use it, or sort it out quick. Egnos does not seem to bad, but this high end accuracy side at the moment is a right pain in the butt.

    When you go onto Web looking for help via Trimble web site, difficult to fish through information to find if can find relevant information that is useful, to try and find a phone number to ring for guidance, NO keep getting shoved around and back to the same old thing RING DEALER. But to be fair to gen agriculture dealer poor fitter can only go so far then is struggling.

    I am lucky in some ways as got one unit through Ag Dealer, the other through a dedicated GPS Company that seem more on top of things by far, but then again that is all they do GPS stuff.

    But you feel so out of control when get a problem to get the info needed to sort it, or know what to do.

    Ujay

  2. #2
    R Wornham
    Guest

    Re: Trimble 750 VRS

    Have you tried cleaning the antenna

  3. #3
    back'o'beyond
    Guest

    Re: Trimble 750 VRS

    What correction signal are you using?
    I'd bet its Trimble VRS-Now.

    For more information about what's going on you need to watch the second info screen where it says CMR age and also Base ID.

  4. #4
    Andrew Kerr
    Guest

    Re: Trimble 750 VRS

    Egnos seems unreliable here too,using HP2 instead.

  5. #5
    Ross M
    Guest

    Re: Trimble 750 VRS

    Hi all,

    VRS is currently a very unreliable service in my opinion, and i wouldn't currently sell it. The issue isn't software or Trimble's fault, but the fact that the mobile phone network doesn't give priority to the data the modem needs.
    The modem uses a 2G signal, but as phones get more sophisticated, the mobile networks are giving data priority to 3G and now 4G devices. The AG3000 box will only do 2G i believe, but the new DCM300 will do 3G on the latest firmware. (v4 i think).
    However, as it's still only trying to download data, and in the opinion of mobile signal providers, not making them as much money as phone calls, text messaging and internet, it will remain on low priority. too many people on the network, and you are bottom of the food chain so too speak. to get RTK accuracy, i can only recommend the good old fashioned radio signal from a Base Station.

    As for the EGNOS signal being poor, make sure that you are looking for the AOR_E 120 satellite. (i think!!) and put it on balance quality, not favour accuracy or you'll get nowhere.

  6. #6
    cp
    Guest

    Re: Trimble 750 VRS

    Have to disagree with ross
    We are currently running RTK via the internet from the our new RTK network and not having any problem with the modems and signal
    If the Modem drops out the starfire drops to RTK-X for a minute and then back to rtk

    If we don't have any phone signal or the phone network fails we get SF2 fall back for 14 days now aswell

    We have the chocie of phone network and sim cards

  7. #7
    Ross M
    Guest

    Re: Trimble 750 VRS

    Unfortuantely, Trimble won't automatically fall back to anything yet, which isn't great. You have to manually change your correction type, which will only be EGNOS as the Omnistar wont kick in without paying! Orange SIM cards seem to be better than vodafone too.

  8. #8
    MrNoo
    Guest

    Re: Trimble 750 VRS

    Had similar problems with my 750 although not as bad as yours, Trimble VRS now package via Vodaphone, I am convinced it`s caused as said by the Vodaphone network dropping the data, RTK float seemed quite a common problem but also had the "session dropped" and the CMR age count up and kick you off VRS. I note during this summer that it seemed better late at night and worse 9am/5pm which leads me to think it was a Vodaphone issue, I did think to get an Orange sim on "pay as you go" but never got round to it.
    Fortunately my local specialist Andrew Collier has been on hand and via New Holland are trying their own VRS base station (42km away) and tried it yesterday whilst slug pelleting, the service was better but I am at the outer edge of it`s limit, it did kick out of VRS once.
    My thoughts are that New Holland seem to be on the case of a decent VRS signal which should be cheaper than the Trimble Now package, after all they are promoting it quite heavily at the moment, so they have an interest in getting it right.
    I think it`s still a "work in progress" but when it works it`s a bl**dy good piece of kit, wouldn`t be without it!

  9. #9
    fergie35
    Guest

    Re: Trimble 750 VRS

    Where is that base located then? We are near Stow and would prefer a local base as even VRS now has issues at times.


    Quote Originally Posted by MrNoo View Post
    Had similar problems with my 750 although not as bad as yours, Trimble VRS now package via Vodaphone, I am convinced it`s caused as said by the Vodaphone network dropping the data, RTK float seemed quite a common problem but also had the "session dropped" and the CMR age count up and kick you off VRS. I note during this summer that it seemed better late at night and worse 9am/5pm which leads me to think it was a Vodaphone issue, I did think to get an Orange sim on "pay as you go" but never got round to it.
    Fortunately my local specialist Andrew Collier has been on hand and via New Holland are trying their own VRS base station (42km away) and tried it yesterday whilst slug pelleting, the service was better but I am at the outer edge of it`s limit, it did kick out of VRS once.
    My thoughts are that New Holland seem to be on the case of a decent VRS signal which should be cheaper than the Trimble Now package, after all they are promoting it quite heavily at the moment, so they have an interest in getting it right.
    I think it`s still a "work in progress" but when it works it`s a bl**dy good piece of kit, wouldn`t be without it!

  10. #10
    Clive
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by cp View Post
    Have to disagree with ross
    We are currently running RTK via the internet from the our new RTK network and not having any problem with the modems and signal
    If the Modem drops out the starfire drops to RTK-X for a minute and then back to rtk

    If we don't have any phone signal or the phone network fails we get SF2 fall back for 14 days now aswell

    We have the chocie of phone network and sim cards
    I think it is very area dependant

    if you are near major road network and there is a crash or delays the first thing to get switched off is data as voice calls get priority on the network, a friend who works on mobile masts reliably tells me

  11. #11
    MrNoo
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by fergie35 View Post
    Where is that base located then? We are near Stow and would prefer a local base as even VRS now has issues at times.
    It is a test base situated at their Marlborough depot I think. If you pm me I can give you Andrew`s number and you can have a chat with him, he knows more about it than me! There maybe one being put up Ciren way if they decide to go ahead with it.

  12. #12
    Ujay
    Guest

    Re: Trimble 750 VRS

    Checked Arial clean, was OK, checked all connections etc all seem ok

    Had tractor in yard all day yesterday with VRS on, did not drop out at all?

    On Trimble VRS-Now, will have to pay greater notice of second page of info.

    I have one unit running on Egnos, the other on VRS-Now, Egnos on both units not too bad. One of the updates I put on certainly improved the Egnos regards did not log out no were near as much under or by trees, and seemed to come back if did very quick.

    Had one of the first 500 when they came in, had a fair bit of software grief for first 18 months then Trimble in the end ironed out most of the clichés and was not bad at all, that is why got faith that trimble will eventually sort the 750 out.
    Trouble is they have used a new operating system to stay compatible with there tablet they have produced, after moving away from Ag-Leader tablet, so think this is why 750 is not as stable as 500.

    I am going to put the 195 ( or 19 something ) into the 750, when I put the 2.2 ( or something like that, I think there is 2 up dates in the 2’s that is when my 750 froze, and had to be replaced, trouble is need the later updates to be able to use the foot switch. But from what heard, been told fair few clichés in the 2’s updates? Best to leave it for a while till been fine tuned.

    There has been a RTK base station installed aprox 3 miles from me,, so in the spring might well use the base station instead of VRS, will have to look into.

    Will be drilling this weekend, lets hope it has settled Down!!!!!!!!

    On drilling today, had a Benny for a couple of runs, then been going perfect for last 4 hours.

    Thanks for info in all your Post’s all makes a lot of sense, and useful info.

    How can your tell if it is Phone Signal Drop causing problem, is it on the second page cmr count as when going OK around 1 – 2 but when gets up around 20-40 trouble. I am using Voda phone, farm next to me is using Orange / T mobile but think he gets issues at times.

    Ujay

  13. #13
    fergyfarmer
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by Ujay View Post
    Checked Arial clean, was OK, checked all connections etc all seem ok

    Had tractor in yard all day yesterday with VRS on, did not drop out at all?

    On Trimble VRS-Now, will have to pay greater notice of second page of info.

    I have one unit running on Egnos, the other on VRS-Now, Egnos on both units not too bad. One of the updates I put on certainly improved the Egnos regards did not log out no were near as much under or by trees, and seemed to come back if did very quick.

    Had one of the first 500 when they came in, had a fair bit of software grief for first 18 months then Trimble in the end ironed out most of the clichés and was not bad at all, that is why got faith that trimble will eventually sort the 750 out.
    Trouble is they have used a new operating system to stay compatible with there tablet they have produced, after moving away from Ag-Leader tablet, so think this is why 750 is not as stable as 500.

    I am going to put the 195 ( or 19 something ) into the 750, when I put the 2.2 ( or something like that, I think there is 2 up dates in the 2’s that is when my 750 froze, and had to be replaced, trouble is need the later updates to be able to use the foot switch. But from what heard, been told fair few clichés in the 2’s updates? Best to leave it for a while till been fine tuned.

    There has been a RTK base station installed aprox 3 miles from me,, so in the spring might well use the base station instead of VRS, will have to look into.

    Will be drilling this weekend, lets hope it has settled Down!!!!!!!!

    On drilling today, had a Benny for a couple of runs, then been going perfect for last 4 hours.

    Thanks for info in all your Post’s all makes a lot of sense, and useful info.

    How can your tell if it is Phone Signal Drop causing problem, is it on the second page cmr count as when going OK around 1 – 2 but when gets up around 20-40 trouble. I am using Voda phone, farm next to me is using Orange / T mobile but think he gets issues at times.

    Ujay
    As soon as your trimble cmr count gets to 39 its done all it can to run 40 seconds without recieving any correction updates and so cuts out.

    If your getting anywhere past 10 seconds IMO you need to try another provider.

    We was on vodaphone and it was terrible.

    Now running 02 its near as perfect as one can ask.

    Have a look on there websites they all show coverage areas. Make sure you click on DATA map and not calls.

    vodaphone was mainly red around us when i had a look, apart from one end of the farm where it was orange. The vodafone sim worked OK there, so the maps must be pretty accurate.

    02 Map shows between orange and mainly green around us.

    FF

  14. #14
    Ujay
    Guest

    Re: Trimble 750 VRS

    My 750 that was returned for repair has been returned, it had a new Mother Board, and was loaded with updates up to 2.5. When fitted it to tractor still had the same VRS issue’s as had with the new borrowed one while mine being repaired, same updates loaded. At least this indicated that poss not 750 issue, unless it was software issue.

    VRS was messing about when calibrating steering in field of repaired 750, dropping in and out, next morning started drilling, went all to rat’s would not log onto vrs or egnos. So left it on drilled free hand, than all sudden was OK for next 10 hours, only logged out once but came straight back. Just not putting Tram’s in, will put them in later when sure things settled down.

    So think poss it is phone signal issue, as suggested might well have to look into another Net Work, will sort it out in the end, only one way is up???

    Ujay

  15. #15
    AFS
    Guest

    Re: Trimble 750 VRS

    have you tied using the Private APN as apposed to the vodafone APN?

    'Priority' is a dangerous issue, the voice network and coverage is different to that of a data network, i've been in a field where i could make a phone call crystal clear and issues with no data.

  16. #16
    moldengineer
    Guest

    Re: Trimble 750 VRS

    We had issues earlier in the year. We are on Essentialsnet but in this area they use the OS base station the same as Trimble VRS use. This was caused by a connection problem at the Ordnance Survey base station. I t took over a week to sort out, the problem was that the system thought the base was online and was intermittently outputting the correct signal but not for long enough. We switched to another base but this was too far away. As far as I am aware Trimble uses a signal from the most local source.

    So there could be an issue with the local base. Essentialsnet provided a base that we installed at the farm and connects to their network over our existing broadband connection. Its still not perfect and will look at the cost of putting our own RTK base and radio system up next year.

  17. #17
    Clive
    Guest

    Re: Trimble 750 VRS

    This thread has confirmed to me that we did the right thing investing in a base station

    Rtk over crappy mobile phone signal never did fill me with much confidence as anything other than fallback when outside radio range which we can do from our base station on the rare occasion we go beyond 25mile away

    Base stations are expensive but it looks like you get what you pay for with rtk

  18. #18
    cp
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by Clive View Post
    This thread has confirmed to me that we did the right thing investing in a base station

    Rtk over crappy mobile phone signal never did fill me with much confidence as anything other than fallback when outside radio range which we can do from our base station on the rare occasion we go beyond 25mile away

    Base stations are expensive but it looks like you get what you pay for with rtk

    Clive you will get that with your SF3000

  19. #19
    Clive
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by cp View Post
    Clive you will get that with your SF3000
    Fall ack to sf2 is a nice feature of the 3000 for sure but the topcons fallback to network rtk from our base which is better still

  20. #20
    Ujay
    Guest

    Re: Trimble 750 VRS

    AFS, I have never heard of an APN, would not have a clue to where or how get one, cost, etc etc.

    CASE have brought introduced a help line service for it’s Trimble customers, ( AFS SUPPOERT CENTER ), so I have been corresponding with Germany via phone and E Mail. I am very impressed with the information and help they have given me, person I have been dealing with certainly seems very dedicated, thorough in investigating and getting to the bottom of my problem. Certainly know their stuff, and seem to be able to get high level Tech knowledge.

    Ujay

  21. #21
    AFS
    Guest

    Re: Trimble 750 VRS

    Quote Originally Posted by Ujay View Post
    AFS, I have never heard of an APN, would not have a clue to where or how get one, cost, etc etc.

    CASE have brought introduced a help line service for it’s Trimble customers, ( AFS SUPPOERT CENTER ), so I have been corresponding with Germany via phone and E Mail. I am very impressed with the information and help they have given me, person I have been dealing with certainly seems very dedicated, thorough in investigating and getting to the bottom of my problem. Certainly know their stuff, and seem to be able to get high level Tech knowledge.

    Ujay
    Pm'd

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