RTK fix not obtained when the corrections are transmitted through XBEE (LR) – SimpleRTK2B

Q&A forumCategory: QuestionsRTK fix not obtained when the corrections are transmitted through XBEE (LR) – SimpleRTK2B
prahaladh asked 2 weeks ago
Hi..
I\’m using SimpleRTK2B boards (each for base and rover). For transmitting RTCM corrections, I\’m using XBEE LR module. 
Details about the configuration:
Base:
UART2 – RTCM3 out – 115200
RTCM messages enabled – 1005,1074,1084,1094,1230
Fix mode – Survey-in, Min. observation time – 180s, Accuracy – 5m (initial testing)
GPS Rate – 1 Hz
 
Rover:
UART2 – RTCM3 in- 115200
GPS rate – 1 Hz
 
In MON-COMM, I\’m getting the data received from UART2 RX but it is getting updated in the \”Unknown\” category instead of \”RTCM3\” category.
The fix status in Base is \”Time\” and the fix status in Rover is \”3D\” and not \”3D/Fixed\” as it comes when corrections are transmitted through UART2 (direct wired connection)
Firmware version of U-center is 1.13
 
Kindly guide me…
Ardusimple
Staff replied 2 weeks ago

Hi Prahaladh,
From the description looks ok:
1. Are you using ArduSimple LR radios or bought somewhere else?
2. Did you change any parameter on the radio?

prahaladh
replied 2 weeks ago

Hii,

I’m using ArduSimple LR radios and as such I’ve connected to SimpleRTK2B (base & rover) – No LR radio configuration done

Ardusimple
Staff replied 2 weeks ago

Could you collect the following info and send to info@ardusimple.com?
1. Record a logfile with base and rover
2. Download the configuration from your board for base and rover
3. Picture of your boards and their connection

prahaladh
replied 2 weeks ago

Yes. I’ll send…

prahaladh
replied 2 weeks ago

Hi…

I’ve a query.

The Survey-In time of SimpleRTK2B is more when XBEE LR is connected to SimpleRTK2B than when SimpleRTK2B is used as standalone base.

What might be the reason ??

Ardusimple
Staff replied 2 weeks ago

Hi prahaladh,
That is only possible if you place the LR antenna right on top of the GNSS antenna, otherwise it should be something else triggering this delay.