[mmaimcal]Re: Comment in ALMA memo 489

[Mark Holdaway]

On Tue, 6 Apr 2004, MORITA, Koh-Ichiro wrote:

> Dear Mark,
> 
> > Mark's new level
> > Yes, I am suggesting that to be a fair comparison, we need to use the
> > same total power data.
> > 
> > I have been informed by Larry that all the 12m (the ALMA 64 and the ACA 4)
> > antennas have the the same electronics for total power.  There are square
> > law analog detectors that can be used for fast total power continuum, or
> > the autocorrelation spectra from the correlators, which can still work
> > pretty fast.  The 4 antennas in the ACA are special in that they are the 
> > only ones which will have nutators.  
> 
> Yes.
> But, my question is "how do you control the antenna scan".
> To get good quality total power data, we need to scan every
> antennavery fast as you know very much.  But for
> interferometric observation, such a scan is too fast to
> take cross-correlation data.  So I do not know
> how to take total power data and interferometeric data
> simultaneously.

We do not need to take the data simultaneously.

   -M

> Koh-Ichiro
> 
> 
> 
> 
>