I have Spirit, Spirit Pro and Spirit GTR (haven't used the GTR yet).

In the Jeti (DS-12), under Timers/sensors and then sensors/logging; I see S Vibes and S RPM - Am I correct that they are telemetry values from Spirit?

I want also Battery Voltage as a telemetry variable - will the GTR have that? is there any other way beside adding an MUI or unisense, or related add-on?

Thanks

Yes, S xx values are telemetry values from Spirit units.
For voltage values and similar, you have to use a MUI sensor or a speed controller that has telemetry (and you either send it to the Spirit unit or to the Jeti receiver to the EXT port), the instructions are here:
http://manual.spirit-system.com/index.php?title=ESC_telemetry

_________________
Spirit System (Spirit W1, RS & GTR & all the others)
Spirit Wave & JETI DS 12
http://www.habada.cz

Thank you for your reply. I should have mentioned, this is a gasser heli (no esc). Still, the approach is the same. I need a MUI or equivalent.

Regards,

For glow or gasoline engines, either the voltage indicator of the receiver in the radio is enough to monitor the on-board battery, or to monitor multiple batteries, e.g.:
http://support.jetimodel.cz/en/katalog/Duplex-2-4-EX/Measure-Sensors-EX/@produkt/MU3-EX/
RPM sensor:
http://support.jetimodel.cz/en/katalog/Duplex-2-4-EX/Measure-Sensors-EX/@produkt/MRPM-HALL-EX/
http://support.jetimodel.cz/en/katalog/Duplex-2-4-EX/Measure-Sensors-EX/@produkt/MRPM-EX/
other:
http://support.jetimodel.cz/en/katalog/Duplex-2-4-EX/Measure-Sensors-EX/@produkt/MFlow2-G800-EX/

_________________
Spirit System (Spirit W1, RS & GTR & all the others)
Spirit Wave & JETI DS 12
http://www.habada.cz