[mmaimcal] pads for test interferometer

[Min Yun]

Just a quick thinking on the longest baseline of 1 km or longer.
The only reason for having one is to test the phase correction
schemes such as fast switching or radiometric phase correction.
1 km is often where the knee of the phase function is, so it
might make sense to go out even further, say 3 km, if the cost
of cabling etc is not too high or not limited by the correlator, etc.



					-- Min
					
					
> Date: Thu, 3 Feb 2000 16:40:42 -0700
> From: Bryan Butler <bbutler at aoc.nrao.edu>
> To: mmaimcal at cv3.cv.nrao.edu
> Subject: [mmaimcal] pads for test interferometer
> Mime-Version: 1.0
> 
> 
> all,
> 
> peter and i had a discussion this morning, and i thought i should
> bring some of this out for open debate...
> 
> peter would like to know if we have any recommendations as to where
> we should put the pads for the test interferometer.  the current
> plan, after some discussion, is to have one set of pads which are
> 100 meters apart, for construction (so that they aren't getting in
> each others way during building), which can then of course also be
> used for interferometry testing.  but, to do short spacing tests,
> a shorter spacing is needed, and we thought that 25 meters would
> be OK.  you want to be far enough away to avoid shadowing if possible,
> but close enough so that strong sources (planets, e.g.) aren't
> heavily resolved.
> 
> peter would like to know if we can make a cogent argument for
> having the shorter baseline even shorter still (15 meters?), or
> a bit longer (30 meters, 40 meters???).  also, he'd like to know
> if we envision a use for a much longer baseline, even if it is
> further down the road (after the D&D phase).  like 1 km, or
> even 10 km.
> 
> 	-bryan