Vectronics VEC-884 - Manual (Page 56)

VEC-884 Owner's Manual
Filter Description 5-4
BP Filter [2]
Use: Custom Voice, FSK, Custom CW Filter.
Passes narrow to wide frequency width.
This filter is an adjustable band-pass filter. The bandwidth (BW) is controlled
by the Tunable Filters right knob. This adjustment is similar to the selectivity
control on a receiver. It can be adjusted from 30 Hz to 2100 Hz. The Tunable
Filters left knob varies the center frequency (fc) between 300 Hz and 3400
Hz. This adjustment is very much like the pass band tuning or IF shift control
on high quality receivers.
For example: If the center frequency (fc) is adjusted to 2200 Hz and the
bandwidth (BW) is adjusted to 600 Hz, all frequencies between
1900 Hz and 2500 Hz will pass. All frequencies not in the
600 Hz bandwidth will be attenuated.
Typical 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