In the June 2008 eNews we reported that in almost all cases spectral line data at 12.5 MHz bandwidth show a noise level too high by a factor of at least 2. We are still not entirely sure when this problem started to occur, but know it was some time after December 2006. Our earlier impression that turning off the correlator self- test eliminated the problem could not be confirmed by subsequent tests. Until further notice we therefore strongly recommend that all observers planning to use the 12.5 MHz bandwidth in their spectral line observations should select a different bandwidth.
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