Hi,
I tried the setting OBSSEL3=37 on a CC2511 which should according to the documention output the fref = 24MHz. But the chip outputs actually fxosc which is 48MHz. Seems to be a typo.
The debug output seems to output fxosc rather than fref: fRef = fxosc for CC2510Fx and fRef = fxosc/2 for CC2511Fx
regards
spachner