Note
QST, Jan 1979, p. 168.
QST, Jan 1980, p. 188.
QST, Oct 1980, p. 138. (MFJ-752B)
The MFJ-752 series is comprised of two tunable audio filtering systems designed to clarity and remove interfering signals from both voice (SSB or AM) and code (CW or RTTY) signals. This is accomplished by a primary filter which is a two-section, four-pole variable filter which has PEAK, NOTCH, LOW PASS, and HIGH PASS functions, and by an auxiliary filter which is a single section two pole PEAK or NOTCH filter. These two independent filters allow you to remove interference while enhancing the desired signal
The 752B, C, and D versions are all incremental refinements of the original based mostly on cost saving and manufacturing techniques. Basic operation and specifications did not change.
