MAX2820_CHANNEL_CF_MASK  130 dev/ic/max2820reg.h #define	MAX2820_CHANNEL_CF_DEFAULT	LSHIFT(37, MAX2820_CHANNEL_CF_MASK)
MAX2820_CHANNEL_CF_MASK 4525 dev/ic/rtw.c   	    LSHIFT(freq - 2400, MAX2820_CHANNEL_CF_MASK));