AFAIK, the "channel" numbers (1-2-3) of an RFX9200 are logical channels, and do not relate to the radio frequency being used.
As can be observed with a tool like Wi-Spy (
http://www.metageek.net/), the RFX9200 always operates on IEEE 802.15.4-2003 WPAN channels 11, 15, 21 or 25, irregardless of the logical channel being set.
Center frequencies for these WPAN channels:
Channel 11 : 2460 MHz
Channel 15 : 2480 MHz
Channel 21 : 2510 MHz
Channel 25 : 2530 MHz