Timewave DSP-599zx, Operating Manual

Page: 52 / 106

4 – Voice Mode
4-4 March 6, 1997
Heterodyne Elimination/Notch Filters
The DSP-599zx has both an automatic and a manual tone notch filter to help
remove interfering heterodynes, CW, and data signals.
Automatic Notch Filter
The automatic tone notch filter can reduce multiple heterodynes 40 to 50 dB,
virtually eliminating the offending signals. The automatic tone notch filter
substantially reduces CW and FSK data signals, depending upon the keying
speed or baud rate. The automatic tone notch filter toggles on and off by
pressing
[Tone]
. The LED next to the key will light when active. The ag-
gressiveness of the automatic tone notch filter is adjustable.
• Press
[Shift+Tone].
Rotate left knob until
9DU $XWR 1RWFK"
ap-
pears on the bottom line of the display.
• Press the left knob to select.
• The top line of the liquid crystal display shows
9&5 9$1
and the bottom
line displays the relative amount of noise reduction aggressiveness
while the automatic tone notch filter function is active.
• Rotate the left knob to adjust the amount of noise reduction.
• The aggressiveness value can be adjusted from one to nine with a default
value of five. The higher the aggressiveness value is set, the greater the
noise reduction.
• Pressing the left knob or pressing
[Shift+Tone]
again stores the new
value and returns the DSP-599zx to its normal operating mode with the
automatic tone notch filter activated. The noise reduction aggressive-
ness will remain at its last setting until it is changed.
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW
Voice
Mode
1
Random
4
Tone
2
599-060
Setup
Test
Rcl/ Store
Spkr/ Chan
High Pass
Center Freq
Time
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW Voice
Mode
1
Random
4
Tone
2
599-100
Setup
Test
Rcl/ Store
Spkr/ Chan
High Pass
Center Freq
Time