LX S100 with Powermouse+ GPS issues

[David Blažek]

Hello everybody!

I would like to ask this question as I have just finished the installation of my new panel and couldn't find the answer for this... S100 connected with Powermouse+ via RJ cable and so on further to the Sotecc splitter and Flarmview display. Working as expected but until second GPS antenna is connected to the S100. Right after that the Powermouse loses the GPS data. If I keep the GPS antenna on S100 only it doesn't work either. Is this standard behavior when S100 is getting this data only from Flarm? It is not mentioned in the manuals./ Thanks for your opinions!

[Alastair Mutch]

I have a similar set-up in my glider with a Powermouse and S100. It needs both GPS aerials but keep them as far apart as you can to avoid interference. 

Alastair

[Adam Sayer]

Here's a couple of suggestions but purely speculative:

Is the PowerFlarm connected to the RJ12 of the S100 or the RJ45 (See 9.6.1.2 of the English S10/S100 manual). Ensure it is connected to the RJ12.

Confirm the cable between the S100 and the PowerMouse is correctly wired (see 9.4 of the English manual). It looks like  V7-GPS-PF is the correct cable.

Try disabling the GPS NMEA sentences from the S100? (see 5.7.13.7.1 of the English manual)

good luck!

On Sun, 16 Nov 2025 at 06:47, David Blažek <info.dav...@gmail.com> wrote:

Hello everybody!

I would like to ask this question as I have just finished the installation of my new panel and couldn't find the answer for this... S100 connected with Powermouse+ via RJ cable and so on further to the Sotecc splitter and Flarmview display. Working as expected but until second GPS antenna is connected to the S100. Right after that the Powermouse loses the GPS data. If I keep the GPS antenna on S100 only it doesn't work either. Is this standard behavior when S100 is getting this data only from Flarm? It is not mentioned in the manuals./ Thanks for your opinions!

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[David Blažek]

Hey Adam! Thank you for your seggestions. Will do the check once again when I get back to the field. Anyway, it is connected as it should be, S100 RJ12 (GPS/FLARM port) to Powermouse+ RJ45 (Port 1) and everything is working fine without the S100 GPS aerial. Might be the interference of these two antennas as Alastair mentioned in his message. I have to try it again. Not really sure about the GPS NMEA as I would like to keep getting these information via BT straight to my Oudie N from S100 instead of Powermouse+.

[Richard Pfiffner]

Move  the GPS antennas at least 6 " apart and on top of the instrument panel cover.

Richard

www.craggyaero.com

[David Blažek]

So the problem was finally solved by getting rid of one GPS antenna´s cable loop stored near to the second antenna´s cable routing. I believe some portion of inductance was involved in this. Everything is now running as expected with both aerials connected. Cables will be shortened once SMC connectors arrive.