This base frequency units combines with the
cd11IfRfStartChannelFrequency to define the
actual frequency of the channel and combines
with the cd11IfRfFrequencySpacing to define the
minimum frequency spacing between two adjacent
frequency channels.
For example, frequency spacing of 5 MHz is
'mHz' in cd11IfRfFrequencyUnits and 5 in
cd11IfRfFrequencySpacing.