[evlatests] Some other curiosities
Rick Perley
rperley at nrao.edu
Tue Oct 9 18:57:31 EDT 2007
The aliasing tests I reported on were in fact made at a variety
of bandwidths -- 12.5, 6.25, 3.125, 1.56, and 0.78 MHz. For three of
these bandwidths, the data looked completely normal (other than the
aliasing, just noted). For the other two, two worrisome problems were
seen.
a) All was normal at 12.5, 3.125, and 0.78 MHz bandwidths.
b) At 6.25 MHz bandwidth, a 'global' delay error between the EVLA
and VLA of 200 nsec (exactly!) was seen. This is easily visible in all
the bandpass spectra.
c) At 1.56 MHz bandwidth, the EVLA and VLA were completely incoherent!
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