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Modulation error ratio

At the optical transmitter I measure 36db mer but when I get to the node this level has changed to 32db. This is 256 qam. I am not sure what is causing a drop of 4db. I would expect some impact but not this much. Any ideas or what I might be missing would be helpful.
This is CABL.com posting #149919. Tiny Link: cabl.co/mNad
There are 4 replies to this message
Re: Modulation error ratio Joe50 7/19/2005 9:53:00 AM
Re: Modulation error ratio RF2Lite2RF 7/19/2005 6:26:00 AM
Re: Modulation error ratio Houston Link 7/18/2005 10:53:00 PM
Re: Modulation error ratio cabledog 7/18/2005 2:45:00 PM