Vectronics VEC-884 User Manual
Page 57
VEC-884 Owner's Manual
Filter Description 5-5
2BP Filter [3]
Use: Custom Voice, FSK, Dual Pitch CW Filter.
Passes 2 independent narrow to wide frequency ranges.
This position allows the use of two frequency-independent variable band-pass
filters in parallel. The Tunable Filters left and right knobs control the individual
center frequencies (f1 & f2) of the filters.
Each filter has the same bandwidth. The 2BP position uses the bandwidth
setting from the BP filter. The bandwidth can be adjusted by switching to the
BP position and adjusting the Tunable Filters right knob.
For Example: To adjust the bandwidth of the 2BP filter, the Tunable Filters
right knob is adjusted to 200 Hz bandwidth while Filters switch
is in the BP position. The Filters switch is then turned to 2BP.
Now two filters are available, with the Tunable Filters left knob
controlling the center frequency (f1) of one 200 Hz filter and
the Tunable Filters right knob controlling the center frequency
(f2) of a second 200 Hz filter.
Typical Dual Band-pass Filter Response
Frequency (Hz)
dB
-80
-70
-60
-50
-40
-30
-20
-10
0
0
500
1000
1500
2000
2500
3000
3500
4000