1 – Introduction
1-10
March 6, 1997
useful for trying to dig out extremely weak signals from the noise and QRM.
The narrow bandwidth is also an excellent way of tuning to a single CW sig-
nal in a crowded band condition. The wider filter bandwidth allows easy tun-
ing and listening to multiple CW signals simultaneously.
Random Noise Reduction
The DSP-599zx random noise reduction has proven to be useful in reducing
a wide variety of noise types, including white noise, line noise and static
crashes. The amount of noise reduction varies according to the characteris-
tics of the noise. Typical noise reduction ranges from 5 dB to 20 dB. In the
CW mode, random noise reduction is generally most effective in the wider
CW bandwidths (400-600 Hz).
Manual Notch Filtering
The DSP-599zx has a manually tuned notch filter. The
[Center Freq]
en-
coder on the front panel tunes the center frequency of the manual notch fil-
ter. The manual notch filter has an adjustable bandwidth allowing removal
of many types of signals such as data signals, CW signals and heterodynes.
Usually a narrow bandwidth filter is most effective for the greatest improve-
ment of a CW signal, but some operating conditions (i.e., a contest) dictate
a wide CW filter bandwidth. The manual notch can remove a single strong
annoying signal.
Marker Tone
Pressing
[Tone]
while in the CW operating mode inserts an audio marker
or spotting tone at the center frequency of the bandpass filter. Tuning the
bandpass filter center frequency changes marker tone center frequency.
Matching the marker tone frequency with the received signal allows switch-
ing in a narrow filter without losing the signal outside the passband of the
narrow filter. The level of marker tone is adjustable relative to the processed
receive signal.
CW Tone Pitch Shift
A feature unique to the DSP-599zx is the ability to easily shift the CW tone
pitch to another frequency. This feature works well with receivers that have
non-adjustable, relatively high pitch CW tone, since most hams prefer to lis-
ten to 400 - 600 Hz CW tones.
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW
Voice
Mode
1
Random
4
Tone
2
599-014
Setup
Test
Rcl/
Store
Spkr/
Chan
High Pass
Center Freq
Timewave
Low Pass
Bandwidth
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 ...
