Strange behavior when using T-LS+ with T3 base

oajioka

Member
We recently started using the T3 base with our pair of T-LS+ rover units (previously we had been using the T-1M base). We tested it near the office and everything worked as expected. Recently we took it out to the field for a job and noticed some strange behavior.

1. After setting up the base and external radio (HPT435BT) I connected to the base with the rover and started it as normal. Typically I will wait for the UHF link to show "OK" on both ends before disconnecting, however the rover never showed "OK". I booted up our second rover unit and immediately got a UHF link and good fix. I then went back to the first unit and opened the UHF settings, and got a pop-up saying "the configuration file has been corrupted, restore factory default yes/no?" I picked yes, then went back to the base and used "from base" to restore the configuration on the rover, and started receiving corrections. Never seen this before, and it may be a one-off but I am curious how the configuration file got corrupted.

2. After working for a few minutes, we began to see a pop-up message on both rovers (see attached screenshot).
Capture.PNG

This message kept reappearing every couple of minutes. The message seemed to be related to the base guard settings, so I went back to check on the base but could not find anything out of place. The base station was set up ~20' from a fairly busy roadway, is the T3 sensitive enough that the passing traffic could be triggering these alerts?

3. After working for a few hours, I was ~1 mile from the base when I stopped receiving corrections. Thinking that I had gone out of UHF range, I called my partner and asked him to restart the base with a higher power output setting. When he connected to the base, where it would usually show "Stop Base" it said "Start Base" even though he was still receiving corrections. He restarted the base with a higher power output and I began receiving corrections again.

We never encountered any of these issues while using the T-1M, has anyone else encountered these issues while using the T3 before?
 

Matthew D. Sibole

Well-Known Member
5PLS
1. I am not sure. That is a question for the developers.

2. This is the base guard feature. You either need to increase the values or turn that feature off.

3. If he were to disconnect from the base and reconnect again it may have shown “Stop Base”. It also may have something to do with trying to connect to the base from a rover that did not tell it to start.
 

oajioka

Member
Thanks Matthew, I will take a look at our base guard settings.

Other than the above issues the T3 performed great, I was able to stake out and tie ~13 pins in varying degrees of oak canopy (mostly bare this time of year) while maintaining a good fix.
 

Shawn Billings - Javad

Active Member
JAVAD GNSS
The 2 inch value (I don't know why it is expressed in inches here), would exceed the 5cm default displacement value, so this was probably what triggered the warning. This is based on the doppler shift of the receiver. It's possible that traffic might have caused the perceived displacement.

As a reminder, make sure "Anti-Theft Guard" is off. This triggers false warnings often and is the weakest of the base guard tests. I think the best are those tied to the accelerometers (acceleration and tilt).
 
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