Impact on sensitivity to other ALMA bands - None!

To achieve the optimum sensitive for the mm-wave bands, one will want to use a reimaging system - the feeds will not be at the Cassegrain focus. The reimaging could be done with lens, but they would need to be cold to not impact the noise performance. Cold lenses require big dewar windows which would also affect reliability and possibly noise performance. Therefore, most likely highly accurate and large mirrors will be used. This means there could easily be room for the Band 1 pick-off mirror. Including Band 1 should not affect the sensitivity of the mm-wave bands. Again, in the interest of simplifying the optics. It is not necessary to use the WVM and Band 1 simultaneously.