[mmaimcal] Re: [alma-sw-ssr] question about frequency/band switching speeds and rates

[Bryan Butler]

i don't follow this.  why do you care what the magnitude of the phase 
center change is between discrete pointings, as long as the instrument 
is stable for each "pointing"?  it's just like "point-and-shoot" 
mosaicing, just moving the primary beams of the antennas while you do 
it, and going fairly fast...  now, if there is an unknown phase shift 
across the PB, then there would be trouble, but last i knew mark had 
worked out a way to calibrate that out...

	-bryan


On 2/4/05 13:08, Ed Fomalont wrote:
> Hello all,
> 
> 1.  Discrete changing of the phasing while doing an OTF is okay, as
> long as the phase change for a source in the beam doesn't change by
> more than about 10 deg between phase center updates - whatever
> time increment this is for the highest frequency and longest baseline.