[evlatests] delays with widar

[Keith Cummings]

Ken Sowinski wrote:
> IF based delays (the DIGITIZER* terms) have been set for using
> the delays measured at Widar.  The largest delay error at the
> moment is 2 ns and most are less than 1 ns.  This is now close
> enough to zero that we should be able to easily tell when there
> is a change of delay.  Antennas/IFs which are not working today
> may still have large residual delay errors.
>
> Delays can be monitored on the fringe display for any scan which
> has ScanIntent set to CALIBRATE_xxxxx regardless of xxxxx.
>   
A minor correction: The Fringe display will only show delays (and other 
relevant data) for the following scanIntents:
CALIBRATE_AMPLI
CALIBRATE_DELAY
CALIBRATE_FLUX
CALIBRATE_FOCUS
CALIBRATE_PHASE
CALIBRATE_POINTING
CALIBRATE_POLARIZATION

-Keith
> As expected delays at bands other than X band are all small as
> they have already been registered with respect to X band using
> the old correlator and any band differences arise in the antenna.
> Delays have now been measured at L, C, S and X bands.  The high
> frequency bands are next.
>
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