[mmaimcal] draft results of holography sensitivity calculations

[Bryan Butler]

i haven't been following this entire discussion very closely, but in 
skimming jeff's last reply ran across the appended statement, with which 
i disagree.  seems to me you will always want to do the final panel 
setting via interferometric holography.  gets you around some of the 
potential errors from doing it from a tower (near field; ground clutter; 
optics differences [if done with a special holography rx]; etc...). 
with the sensitivity of ALMA, you'll be able to find bright enough 
sources (certainly the SiO masers at least).

whether you want to set the panels up at the high site or not is an 
operational/safety issue...

	-bryan


On 12/5/04 08:49, Jeff Mangum wrote:
> 
> As I said above, interferometric holography serves only one purpose,
> to check the elevation dependence of the surface.  I believe that this
> can be done with low-spatial resolution measurements.
>