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Audio Notch Filter


Replaced by

Return to discontinued Filters

Discontinued Audio Filters 

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The MFJ-722 is an SSB/CW tunable 70dB notch filter. It has eight pole active IC filtering and uses cascaded low-Q stages.

In the CW mode, three bandwidths are featured: 80, 110 and 180 Hz.
The center frequency is 450 Hz up to 15 dB. 5.5 x 2.5 x 5 inches.

This item requires 9-15 VDC @300 mA. The optional MFJ-1312D power supply is suggested. Click here to view larger.

Order # Item Description Price Order
   MFJ-1312D 12 VDC 500mA AC Adapter Discontinued

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