5 – CW Mode
5-2
March 6, 1997
Noise Reduction
To activate random noise reduction, press
[Random]
. The LED next to the
button lights when the feature is activated.
CW Operating Hint
The extremely narrow linear phase filters in the DSP-599zx will allow you
to copy very weak and closely spaced CW signals. Use 10 to 100 Hz band-
widths, but tune very slowly. Since many radios are difficult to tune slow-
ly, use the bandpass center frequency control to help pick out the weak and
closely spaced signals. If you want to change your receive frequency, the
RIT or Clarifier controls on some receivers allow very fine tuning. If you
have little interest in working very weak signals, tune with the bandwidth
set at 150 to 600 Hz and decrease the bandwidth further only if you need
to eliminate QRM. Use the 10 to 25 Hz bandwidths if you are trying to
copy a very slow CW signal (10 words per minute or less). EME (Moon-
bounce) is a typical application for the 10 to 25 Hz filters. Random noise
reduction (Random) is especially helpful when listening to CW in the 400-
600 Hz bandwidth.
Use the
[Random]
and
[AGC]
combination to boost the level of very
weak CW signals when your receiver is at maximum gain. Some CW sig-
nals seem to magically pop out of the noise.
Manual Notch Filter
The manually tuned notch filter is equally effective in reducing the interfer-
ing signal levels, but may be used to eliminate a single heterodyne, CW or
data signal in Voice and CW modes.
•
Activate the manual notch function by pressing
[Shift+Tone].
•
Rotate the left knob
[Center Freq]
to change the notch center frequen-
cy (NCF) of the filter in 10 Hz steps.
•
Rotate the middle knob
[Bandwidth]
to adjust the notch bandwidth
(NW). The lower the value, the narrower the filter.
•
After tuning the filter to the desired center frequency and adjusting the
bandwidth, push the momentary switch built into the left knob.
The display changes back to the original operating mode with a
q
icon in the
upper right corner of the display indicating that the manually tuned notch fil-
ter is active.
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW
Voice
Mode
1
Random
4
Tone
2
599-042
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 ...
