Date: Wed, 13 Oct 2010 15:49:22 -0400 (EDT) From: Jun-Hui ZhaoTo: Dan Marrone , melvyn wright Cc: smamiriad@cfa.harvard.edu, Peter Teuben Subject: Re: miriad beta trouble Hi Dan & Mel, I have made a new beta version (beta version 1.1.2.) (http://www.cfa.harvard.edu/sma/miriad/download/). The smalod now includes the five variables: > antaz :d: 23 > antel :d: 23 > chi :r: 23 > lst :d: 1 > freq :d: 1 Chi2 is not included and we can do it in a later time when someone wants to test Bob's programs. Please help us to test them. Also, in this beta version, a new program SmaSplt has been added, which splits SMA DB data into a subset for different purposes to match users' requirement. This program includes the function of select=window(...) as that in other miriad programs (uvaver, uvcal ...) but with simple usage. Please also test this program and let me know if you want any other options to be included. Jun-Hui >>>>>>>>>>>>> inline doc for smasplt <<<<<<<<<<<<<<< Task: smasplt Responsible: Jun-Hui Zhao SMASPLT special for SMA 4GHz mode data, splitting the uv dataset into either ch0 or 48 spectral chunks Keyword: vis The name of the input uv data sets. The input data must be SMA 4GHz data with 49 spectral windows (ch0 + 48 spectral chunks). No default. Keyword: out The name of the output uv data set. No default. Keyword: options This gives extra processing options. Four options can be given: ch0 Means taking the first channel (ch0) data for continuum, equivalent to select=window(1). Default is the 48 spectral chunk data. all Means all the 48 spectral chunk data, equivalent to select=window(2,3,...,49) or select=-window(1). if1 Means the first IF in the sideband--the first 24 spectral chunk data, equivalent to select=window(2,3,...,25). if2 Means the second IF in the sideband--the rest 24 spectral chunk data, equivalent to select=window(26,27,...,49). On Wed, 13 Oct 2010, melvyn wright wrote: > Hi Bob, > > Thanks for explanation. Handling polarization switching on the SMA is > a compelling > argument for an additional uvvariable for the SMA. > > cheers, > > Mel. > > On 10/12/10, Dan Marrone wrote: > > Hi Bob, JH, > > > > It's true that I didn't have much success with the particular code that was > > put together to handle the special SMA polarization situation. I didn't > > recall that the code handled the pol-switching case better though, I'll have > > to re-look at that. > > > > The OVRO antennas do have only one rotation, by this convention. The > > receivers tilt with the elevation, as you recalled. > > > > Dan > > > > > > On Oct 12, 2010, at 6:24 PM, Bob Sault wrote: > > > >> Jun-Hui, Mel, > >> > >> For the SMA's nasmyth mount, the rotation of the feeds with respect to the > >> sky > >> happens in two stages. At both stages, polarimetric leakage can be > >> introduced. > >> Because these two rotation points change independently, in principle you > >> need to > >> account for them separately in the polarimetric calibration. There are two > >> > >> rotation angles. > >> > >>