The reason is that the conventional GTB has profiles to suit 40mhz. But I am told that the optimum frequency for brushless actually interferes with 40mhz so isn't included.
But the Spektrum version, that has the better profiles, the ones that 'may' cause interference with 40mhz, but it won't with Spektrum.
I know of someone using one for Spektrum in a non spektrum car, and its been working fine.
I am using the none-spektrum GTB, only because thats what i got as I wasn't running spektrum when I got it, am now tho.
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