I am trying to run my new GRX2 with my old Hiper+ receivers.
When I use a GRX2 as a base, the GRX2 rover returns the correct elevation while the Hiper+ rover is about 90 mm lower.
When I use a Hiper+ as a base, both the GRX2 and the Hiper+ rover return the correct elevation.
I have tested this with the same data collector in the same job with the same datum and geoid with the same rod heights set for both the bases and rovers.
I have checked that the rover and base rod heights were set to vertical distance.
I generally set the base rod height to zero upon establishing it on a 5/8 readi-rod for machine control, but I changed that height to 1 M thinking the zero height may be doing something but it still returned the same discrepancy.
The discrepancy seems to be about the distance from the phase centre to the vertical measure point.
I can't figure anything wrong with my configuration setup and am thinking it is in the receivers.
I am using Topcon Magnate Ver 4.2, but also notice it in our excavator with older Topcon Receivers.
Any help is greatly appreciated.
I know this is probably an old topic for you by now.. But I'm hoping you have found a solution to your problem.?ÿ I have the same issues except I have a GRX2 / Geomax Zenith35 combo. Please let me know if you have found a solution. I use a Carlson Surveyor2 DC running Survce 5.0.?ÿ If you'd rather, you can email me.. LSherman@powellcwm.com Thanks.
I saw the likely answer to your problem on another thread related to machine control using equipment from different manufacturers.?ÿ?ÿWhere the respondent noted:?ÿ ?ÿif your survey controller (or machine controller) doesn't recognise one of the antenna types, it assigns zero as the antenna offset.?ÿ ?ÿ
The solution when using mixed, different or unknown equipment types is to measure/set the base height to the antenna phase centre (APC) rather than to the bottom of the antenna mount or to the bumper (as these offsets are calculated and set internally by your survey/machine controller provided it has access to the offset data for your antenna).
Another less likely possibility is that your survey controller has a missing or corrupt Antenna.dat or Antenna.ini file.?ÿ
You might also check if your survey controller lists "Unknown Antenna Type" or "Unknown External" as an antenna option as this will probably force Zero antenna offset to be applied.?ÿ In which case you would measure base/rover heights to the antenna phase centre (APC).
