[evlatests] X-band subband ordering

[Walter Brisken]

Looking at some VCI documents with Adam earlier today we were surprised to 
see LSB used for all bands where I would have thought X-band to need the 
opposite sideband sense...

-W

On Fri, 19 Feb 2010, Rick Perley wrote:

>    A quick perusal of X-band data shows that the ordering of the
> subbands is reversed:
>
>    The correct spectral features (and continuity of phase) are
> recovered if the subbands are ordered {4,3,2,1}, rather than their
> current ordering {1,2,3,4}.  Note that this is not the same as simply
> reversing the frequency axis.  It appears the frequency ordering within
> each subband is correct (and runs 'backward').
>
>    Data quality looks good, but a closer inspection is needed.
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