[Difx-users] Correlating Overlapping Bands {External}

[Phillips, Chris (S&A, Marsfield)]

Hi Joe

This is really impossible to say without seeing the config files. Best to to tar up the minimum set of files needed to run vex2difx (the .vex and .v2d files at least and any files they refer to (e.g. filelists)

Cheers
Chris

> On 23 Feb 2022, at 04:50, Joe Skeens via Difx-users <difx-users at listmgr.nrao.edu> wrote:
> 
> Hi all,
> 
> I'm attempting to correlate data coming from two different types of antennas with different (but overlapping) frequency bands, and I'm having some trouble with setting up a zoom section in the v2d file to do this. 
> 
> As it stands, when running vex2difx, I get a warning saying, "Cannot find a parent freq for zoom band X of datastream Y for antenna Z," and the zoom band is dropped, leading to invalid records when the correlation proceeds. I've tried the ANTENNA parameters addZoomFreq and zoom, and both seem to lead to this outcome. I see in the freqId parameter in the SETUP section a blurb about selecting a parent band, but I'm not sure how this is applied--after selecting the freqIds of interest, there's no change in the warning message. (As a note, I have to select the freqIds of both antennas here because I'm unsure of how to apply different setups for different antennas to a single source if that is possible).
> 
> Am I committing an obvious blunder here or missing something in my setup? I should also note that I'm attempting to correlate complex data with real data, is this something that is supported in the current version of DiFX, or do I need to convert one of my datasets for compatibility? Any advice/expertise would be greatly appreciated!
> 
> Best,
> Joe
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