Brian, It appears the customer may have been using 4x interleaving instead of 2x per the config file I sent. This is one reason why they are seeing some of the spurs I did not. The 2x interleaving mode also disables the offset corrector block by default. This may be why they saw the 1000MHz tone attenuate so much as this block will be enabled in 4x mode. Regards, Jim
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