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Saskatoon, Canada | I have a trimble 750 firmware 7.71 with trimble RTX rangepoint in a MF 9560 combine that was autosteer ready. When I get 3/4 the way down the half mile heading north I lose satellites down to 6 and and the NAV autopilot disengages. The status gps icon is yellow. Any other dircection east, west, south works good and have 15 or 16 satellites. Trimble did resend the passcode for rangepoint that did not help.
I was wondering if anyone have any ideas where I could start fixing. |
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SWMN | Where is the globe located? Possible getting shadowed by the grain tank? |
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Saskatoon, Canada | At the front of the cab. It could be getting a shadow. from the center of the gps globe to the top of the hopper is 5ft away.
Edited by rheuch 9/27/2017 23:28
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Saskatoon, Canada | pic
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 20170927_213403.jpg (42KB - 75 downloads)
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Red River Valley | I would say you are getting shadowed from the hopper. Try installing the globe higher or further in front of the cab. |
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| Look up in grain bin where the (factory antenna) would have been mounted, on front panel when unfolded. Threads are the same as the AG 25. Re do your antenna position measurements and steering calibration's this isn't too bad. That bin does move a little when empty but have been running auto steer on combine and yield mapping with 2050 and works pretty good. Have had more issues with steering angle sensors and hyd steering valve's and getting a good calibration on this series of machine.
You can build your own antenna mast to raise it up higher. Other posts are correct that your bin is shadowing your antenna. Your correction signal is coming from the south so when you are driving north your bin can interfere with your signal which is why you are seeing less satellites and also you could be dropping your correction signal more importantly. You need at least 4 satellites to operate and 5 when you first power up. |
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| To add on to what ih_jon said, your differential satellites (133, 135, and 138 if memory serves me correct) are located above the equator as stationary satilites, unlike the WAAS and GLONASS that orbit the Earth. Being in Canada puts them lower in the southern sky causing you to lose signal going north. Another reason to move the receiver to the grain tank, is that you are probably getting some satellite reflection off of the grain tank too, while a lot of people do it and it works fine, it can cause some errors with the signal quality. |
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roaming | premoj - 9/28/2017 10:32
To add on to what ih_jon said, your differential satellites (133, 135, and 138 if memory serves me correct) are located above the equator as stationary satilites, unlike the WAAS and GLONASS that orbit the Earth. Being in Canada puts them lower in the southern sky causing you to lose signal going north. Another reason to move the receiver to the grain tank, is that you are probably getting some satellite reflection off of the grain tank too, while a lot of people do it and it works fine, it can cause some errors with the signal quality.
...unlike the WAAS GPS and GLONASS that orbit the earth.
The OP said he's using RangePoint RTX; I don't know where the RangePoint correction is broadcast from, but I would bet it's from one or more geostationary satellites located somewhere over the Equator, like WAAS. |
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Trimble 750 -lose GPS signal driving north only
