Hi there,

Is it possible to use GTR unit with a receiver, spesifically Frsky receivers?

Cheers
Kagan

No, the units RS / GTR are only for Jeti transmitter (the Jeti receiver is built-in).

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

Okay, I know this already, but the thing I wanted to know that if it's possible to make it by a firmware change or little bit tinkering ? Or is it completely impossible?

As I best understand it, the Spirit RS and Spirit GTR (the Spirit units with the antennas) are only compatible with Jeti radios, and one CANNOT connect an external receiver to them (Futaba, Spektrum, Graupner, JR, open source, etc.) to work with a non-Jeti radio. I don't know if this is a hardware or a software limitation. Perhaps this limitation may be do to some sort of legal agreement with Jeti. Interestingly, both of these flight controllers (RS and GTR) will accept the soon to be released Spirit WAVE receiver and work with the soon to be released Spirit WAVE radio, which makes me think this external receiver incompatibility is a software lock limitation and not a hardware limitation.