4 – Voice Mode
4-2
March 6, 1997
Noise Reduction
To activate random noise reduction, press
[Random]
. When the feature is
active, the LED next to the key lights.
•
Press
[Shift+Random]
to adjust the aggressiveness of Noise Reduc-
tion.
•
Then turn the left knob to adjust the amount of random noise reduction.
•
The top line of the liquid crystal display shows
915
and the bottom line
displays the relative amount of noise reduction aggressiveness while the
VNR function is active.
•
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+Random]
again stores the
new value and returns the DSP-599zx to its normal operating mode. The
noise reduction aggressiveness will remain at its last setting until it is
changed.
Noise Reduction Operating Hints
Power Line Noise
If your receiver has variable noise blanker controls, it is often possible to
use the noise blanker and the DSP-599zx Random mode together. This can
be a very effective noise reduction method for impulsive power line noise.
Set the receiver noise blanker to remove the high amplitude noise spikes
and the DSP-599zx to remove the remaining noise. An advantage of this
combination is the ability to reduce the noise blanking settings of the re-
ceiver to minimize the blanking distortion caused by strong signals near
the receive frequency.
Static Crashes
It is often possible to reduce atmospheric static crashes to a tolerable level
using the DSP-599zx random noise reduction mode. It is important to try
different AGC, input attenuator and RF gain settings on your receiver in
addition to the DSP-599zx. Fast AGC with 10 - 20 dB of input signal at-
tenuation usually helps prevent the receiver front end from overload and
the AGC from desensing the receiver. Results vary with different receivers
- don’t be afraid to experiment. Don’t try to operate if lightning is over-
head! Disconnect your antenna and read this manual again.
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW
Voice
Mode
1
Random
4
Tone
2
599-023
Setup
Test
Rcl/
Store
Spkr/
Chan
High Pass
Center Freq
Time
Summary of Contents for DSP-599zx
Page 1: ...DSP 599zx Audio Noise Reduction Filter Operating Manual March 6 1997 TECHNOLOGY INC ...
Page 56: ...4 Voice Mode 4 8 March 6 1997 ...
Page 62: ...5 CW Mode 5 6 March 6 1997 ...
Page 92: ...8 Troubleshooting 8 4 March 6 1997 ...
Page 96: ...Appendix B Glossary A 4 March 6 1997 ...
Page 98: ...Appendix C Product Warranty A 6 March 6 1997 ...
Page 100: ...Appendix D Electromagnetic Interference A 8 March 6 1997 ...
Page 102: ...Appendix E Schematic Diagrams A 10 March 6 1997 ...
Page 103: ...DSP 599zx Audio Noise Reduction Filter March 6 1997 A 11 ...
Page 104: ...Appendix E Schematic Diagrams A 12 March 6 1997 ...
Page 105: ...DSP 599zx Audio Noise Reduction Filter March 6 1997 A 13 ...
Page 106: ...Appendix E Schematic Diagrams A 14 March 6 1997 ...
