1 – Introduction
1-12
March 6, 1997
Data Tuning Function
Pressing
[Shift+Function]
turns the tuning display on. This display pro-
vides information graphically to allow precise tuning of the receiver. The
display also shows the strength of the incoming data signal.
Random Noise Reduction
The DSP-599zx random noise reduction function is not specifically de-
signed for data signals, but has been field proven to be useful for noise re-
duction under some conditions. It is usually most effective for 45.5 baud
RTTY signals.
RTTY Modem
The DB-9F connector provides an RS-232 compatible connection for the
RTTY modem output to a computer. The output is demodulated FSK in the
same code format (Baudot, ASCII, etc.) as the received signal. It is not de-
coded or changed in any way except for demodulation. The AFSK modulat-
ed output for the transmitter appears on the line output connector of the
selected channel. The channel is selectable within setup. The PTT output
signal needed to put your transceiver in transmit mode is part of the DIN
connector for the appropriate channel.
The AFSK output is a modulated AFSK signal in the same code format
(Baudot, ASCII, etc.) as the keying signal from the computer. The DSP-
599zx does not encode or change the signal in any way except for AFSK
modulation. A software terminal program that can decode and encode Bau-
dot and ASCII code needs to be installed on the computer connected to the
DSP-599zx. Timewave does not provide the terminal program. This modem
is for RTTY operation only with signaling rates at 75 Baud or less.
This modem feature is designed for RTTY operation. It is not designed to be
used as a TNC.
RTTY Remodulator
The DSP-599zx has another special data function for RTTY only. After
passing through the optimized RTTY bandpass filter, a precision DSP-based
FSK detector in the DSP-599zx demodulates the noisy incoming RTTY
tones and uses the recovered digital data to drive a precision DSP-based
AFSK generator. This remodulation process takes place entirely in the DSP-
Function
6
Shift
5
AGC
3
Bypass
Data
DSP-599zx
CW
Voice
Mode
1
Random
4
Tone
2
599-057
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 ...
