Noise margin setting is a logarithmic scale, not a straight line. I don't know your router, but most tweaking is by setting a percentage of the value your ISP has set at the exchange end.
I think the standard Sky setting is 7dB. 100 therefore has no effect.
I can't do logs in my head
, but on the more usual 6dB setting 50 would give you 3dB, 200 would give you 9dB. If you started from a base setting of 12dB by your ISP then 50 would give you 9dB, and 200 would give you 15dB.
With your base figure of 7dB, the results you are getting look about right.
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Edited by RobertoS (Tue 07-Feb-12 13:33:14)