Memo to:  GB Software Group
From: F. Ghigo
Date: 7 January 2003

Subject:  Requests for next M&C Release

1. Provide pointing peak-up capability with scanning in azimuth and elevation.
	This requires support from iards/aips++ as well as GO procedures.


2. Provide procedures for peaking up the subreflector position, to wit:

     a. move through specified range of subreflector Y, while holding 
	telescope RA/DEC position constant.

     b. A similar procedure is needed for the subreflector X coordinate,
	but here it is necessary to adjust the elevation as the X is changed.
	The procedure will have an X scale parameter for specifying 
	the relation between X and elevation.

     c. And finally, a similar procedure for the Z-coordinate.

     Actually, for all 3 procedures, you should be able to specify the 
     scale factor in both elevation and azimuth.

     These procedures also require support from iards, so that the 
     subreflector offsets can automatically be updated.

     These procedures will make it possible to improve the focus model,
     and to check any improvements to focus models.  The methods we have
     now are pretty cumbersome, and unable to give very accurate results
     at the higher frequencies.

     These procedures I regard as necessary for commissioning of 
     K-band and higher frequency receivers, and well as being needed for
     PTCS.  Accordingly, they should have very high priority.

3.   It should be possible to do pointing peak-up on planets.
	The primary need is for the correct RA/DEC position of the 
	mid-point of each scan to be stored in the GO fits file
	when observing planets, or using a user-defined ephemeris.
	
4.   The OnOff and OffOn procedures should insure that the "off" scan
	follows the same track in (az,el) as the "on" scan.
	At present one can only approximate this by specifying
	an offset angle between the on and the off based on the scan
	duration and an estimate of the setup time.

5.  The GO fits file should record the requested scan duration and all
	the procedure parameters for whatever procedure is being run.