MFJ MFJ-784B - Filter Specifications

MFJ-784B Instruction Manual
Introduction Error! Main Document Only.-7
Filter Specifications
Filter Left Control Right Control Attenuation
7
Type
8
LR/HR
1
LR: 200-2200 Hz HR: 1400-3400 Hz 57 dB @ 75 Hz FIR
BP fc: 300-3400 Hz BW: 30-2100 Hz 47 dB @ 60 Hz FIR
2BP
2
f1: 300-3400 Hz f2: 300-3400 Hz 47 dB @ 60 Hz FIR
CW
3
fc: 300-1000 Hz BW: 30- 700 Hz 47 dB @ 60 Hz FIR
SSB
4
fc: 600-1700 Hz BW:1000-2500 Hz 57 dB @ 75 Hz FIR
RTTY Jumper Programmable 47 dB @ 60 Hz FIR
HF PACKET Jumper Programmable 47 dB @ 60 Hz FIR
AMTOR Jumper Programmable 47 dB @ 60 Hz FIR
PACTOR Jumper Programmable 47 dB @ 60 Hz FIR
SSTV/FAX/WeFAX Fixed @1050-1350 Hz and 1450-2350 Hz 45 dB @ 60 Hz FIR
Manual Notch f1: 150-3400 Hz f2: 150-3400 Hz 40 dB @ 95 Hz IIR
Manual Notch (CW mode) f1: 300-1000 Hz f2: 300-1000 Hz 40 dB @ 105 Hz IIR
Multiple Automatic
Notch
5
Entire freq. range of the received audio Up to 50 dB LMS
Random Noise
Reduction
6
Entire freq. range of selected band-pass filter Up to 20 dB LMS
Note 1: The
LR/HR
filter becomes a band-stop filter when
LR
is adjusted higher than
HR
or becomes an
all-pass filter when
LR
is adjusted equal to
HR
.
Note 2: The
2BP
filter uses the bandwidth setting last used in
BP
filter but allows independent variation of
the two center frequencies.
Note 3: The
CW
filter has an optional jumper-programmable sidetone filter.
Note 4: The
SSB
filter has its lower cutoff frequency limited to 175 Hz.
Note 5: The multiple automatic notch has four jumper-programmable levels of aggressiveness and ables
to eliminate up to four changing tones or heterodynes.
Note 6: The random noise reduction has a variable level of noise reduction.
Note 7: All FIR and IIR filter attenuations are calculated in dB @ a distance in Hz outside the passband. All
LMS filter attenuations are dependent on the characteristics of the noise.
Note 8: All FIR filters are linear phase with a 23 mS time delay and have the upper cutoff frequency limited
to 3900 Hz.