[Discuss-gnuradio] OFDM Frequency Spacing

Hello GNURadio Users,

Is it possible to specify the frequency spacing of the carriers in the OFDM Transmitter Block or Carrier Allocator block? My assumption is the carrier spacing is calculated from the sampling rate and the FFT length (e.g, if sampling rate is 640k and fft length is 64, is the frequency spacing 10 kHz). It would be nice to have the capability to manually define the frequency bin spacing. 

Thanks,

ARob