The centre frequency of the centre fine channel of a coarse channel equals the centre frequency of the coarse channel.
Even Fine Channel per Coarse Channel Notes
In the "even fine channel per coarse channel" case, for the ease of processing the data, the 0th fine channel is included. This fine channel combines two non-contiguous
fine channel halves from each end of the coarse channel, so a single start and end frequency are not meaningful. However we still assign this channel a centre frequency
(equal to the start of the coarse channel), so that all fine channels are equally spaced within the coarse channel.
- Legacy MWA Correlator with 20 kHz fine channel width: In this case the fine channel frequencies are offset by +5 kHz
- Legacy MWA Correlator with 40 kHz fine channel width: In this case the fine channel frequencies are offset by +15 kHz
These exceptions result in the fine channel frequencies of 20kHz and 40kHz Legacy MWA data NOT being the same as 20kHz and 40kHz MWAX data.