[mmaimcal] [Almasci] B7 Change Requests

[Todd R. Hunter]

Hi Richard,

Q1: Yes, you would have to correlate USB with USB and LSB with LSB. In 
order to convert the baseline-based results to antenna-based results, I 
think you may want to include more than the 4 total power antennas in the 
correlation (to have confidence in the solutions).  This would seem to 
require a re-config of the correlator and the use of some of the other 
ALMA antennas as part of the observation set. Another issue to look out 
for is that there are no Galactic absorption lines in the band toward the 
chosen "calibrator".  (SMA has seen fairly deep, narrow CO absorption 
toward various 3C objects.  My recollection is that this was mostly 
noticed in 2-1, but will likely have some 3-2 component as well.)

A question I have is: will the differing atmospheric transmission (and/or 
ozone features) in the two sidebands affect the solutions?

Q2: I checked your algebra for U & L and get the same result. Your note 
that the method fails completely for a 3dB sideband ratio is worth 
stressing.  That is, this method will not work at all for a well-balanced 
DSB receiver (i.e. Band 9).

I'll try to confirm your equation for the propagation of uncertainty later 
today.

Regards,
Todd

On Tue, 24 Apr 2007, Richard Hills wrote:

> Thanks for yours.  Looks like we have parallel e-mail circulations going 
> on this.
>
> I just sent the attached to the list that I had been seeing.
>
> Best Richard