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==SSB slope tuning==In SSB slope tuning, one filter passband can be shifted up in frequency and the other filter passband can be shifted down in frequency, effectively narrowing the bandwidth of the combined filters. Basically you can narrow from either end and to what degree best helps to eliminate noise and near frequency interference. An excellent article on [http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/2001/02/page42/index.html How to maximize your receiver's effective selectivity] written by ham radio operator Rob Kalmeijer covers the use of slope tuning.