[daip] Re: AIPS FRING

[Eric Greisen]

Yuri Y. Kovalev writes:

 > Task: FRING. I am doing global FRING.
 > For SNR cutoff = 4 I get for some scans the following message:
 > fourie> FRING1: Sorry, the data has partitioned into multiple
 > fourie> FRING1:    disjointed subarrays. Flagging some good
 > fourie> FRING1:    solns. silly, aint it?
 > fourie> FRING1: No path from REFANT to ANT #  1, blanking solution
 > fourie> FRING1: No path from REFANT to ANT #  3, blanking solution
 > fourie> FRING1: No path from REFANT to ANT #  5, blanking solution
 > fourie> FRING1: No path from REFANT to ANT #  7, blanking solution
 > fourie> FRING1: No path from REFANT to ANT #  8, blanking solution
 > fourie> FRING1: No path from REFANT to ANT # 10, blanking solution
 > 
 > It is strange and I do not understand very well, what does
 > it mean for my data which do not have multiple subarrays.
 > 
 > If I use SNR cutoff = 3, I do not get such messages at all.
 > 

It is this last remark that that suggests the source of the problem -
if you set the SNR cutoff high, then many baselines to the REFANT are
flagged and then there is no way to reference the phases to that
REFANT,  You could try a different REFANT or accept using data of
poorer SNR.

Eric Greisen