LPS node TX problem

All discussions related to the Loco Positioning system
Post Reply
Posts: 7
Joined: Thu Apr 01, 2021 1:25 pm

LPS node TX problem

Post by cmh0818 »

HI there!
I have a LPS TX issue.
i use 6 LPS nodes as TDOA2 mode.
But some of that, they don't often give data.
i mean it didn't light up the TX led.
When LPS node operate well, we can watch the 4 led lights(RXOK, SFD, RX, TX).
But Some LPS nodes the led was often off...... and i don't know why....
Is it sensor problem? should i change the sensor as a new one?
plz help....
Posts: 525
Joined: Tue Jun 30, 2015 7:47 am

Re: LPS node TX problem

Post by kristoffer »


In TDoA2 anchor 0 is the master anchor that the other anchors synchronize to. If the other anchors do not receive anchor 0 they will not know when their time slot is so they will not transmit. I suspect that your anchors may be too far away from anchor 0 and that is why you get this problem.
You can verify by moving the "silent" anchor(s) closer to anchor 0 and check that it starts to transmit.

The long term solution is to increase the TX power of the anchors, see viewtopic.php?f=16&t=4731 to cover a larger flight space.

You may also be interested in switching to TDoA3 that does not use one single anchors for synchronization and is more robust from that point of view.
Post Reply