MFJ-784B Instruction Manual
Introduction Error! Main Document Only.-3
Product Overview
The MFJ-784B tunable DSP filter is a highly selective audio filter suitable for
most amateur applications. The MFJ-784B contains 5 tunable filters, 5 pre-
set filters, a tunable manual notch, an automatic notch filter, and an adaptive
noise reduction filter. Filter settings can be saved into one of ten memory filter
positions.
The 5 tunable filters consist of the following:
LR/HR Low Reject/High Reject
BP Band-pass
2BP Double band-pass
CW CW mode band-pass
SSB SSB mode band-pass
The 5 pre-set data filters are band-pass filters programmed with jumpers for
the different data modes mark-space frequencies and baud rates:
RTTY
HF PACKET
AMTOR
PACTOR
SSTV/FAX/WeFAX
The tunable manual notch filter attenuates 2 tones manually with the front
panel controls.
The auto notch filter attenuates up to 4 tones automatically. The automatic
notch will attenuate moving or shifting tones. The automatic notch is disabled
in the following modes: CW, RTTY, HF PACKET, AMTOR, PACTOR, and
SSTV/FAX/WeFAX.
The noise reduction filter uses adaptive and manually adjustable algorithms to
provide up to 20 dB noise reduction. The amount of noise reduction is
adjustable with a front panel control.
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