Manually choose frequencies for osmotrx

[Enzo Damato]

Hello. I am working on setting up an osmoTRX based base station. Where I 
am in the US, between 902 and 928 MHz is part of the ISM spectrum, and 
unregulated. Therefore, I would like to configure my base station to use 
both an uplink and down link frequency within this range. However, none 
of the pre-existing ARFCN options have both the uplink and downlink 
frequencies within this band. Is it possible to manually shift the 
frequency used by the base station, or manually select the up/down 
frequencies so that both remain within this range?

Thank you for your help,
Enzo Damato