DSP-599zx Audio Noise Reduction Filter
March 6, 1997
1-13
599zx. The precise clean tones from the RTTY AFSK remodulator can feed
any analog multimode controller or TU via the DSP-599zx line audio output.
Many analog RTTY demodulators have difficulty with noisy signals of
varying amplitude, but virtually all of them can adequately demodulate the
precise DSP AFSK generator output. The
[Function]
push-button selects
either the remodulator with RTTY filters or the RTTY filters only. This re-
modulator is optimized for non-burst data at 75 Baud or less.
RTTY FSK Test Signals
Press
[Tone]
while in the non burst Data mode at 75 baud or less activates
a sync nul (diddle) test tone. If the baud rate is 100 baud or higher, pressing
[Tone]
activates a space mark reference calibration tone.
Pressing
[Shift+Tone]
while in the Data RTTY mode at 75 baud or less in-
serts an audio FSK test signal into the receive channel. The “RYRY” test
signal is centered at 2210 Hz with a frequency shift of +/- 85 Hz. The baud
rate is determined by the RTTY parameter settings. The level of marker tone
is adjustable relative to the processed receive signal. If the baud rate is 100
baud or higher, nothing happens when
[Shift+Tone]
is pressed.
Test Instrument Mode
The Test Instrument function helps analyze signals and other equipment. It
includes an audio millivoltmeter, an audio signal generator, and an audio
tone decoder.
Audio Millivoltmeter
This mode measures audio voltage levels from other equipment including
microphones, TNCs, multimode controllers, and receivers. Measurements
are both peak and true RMS millivolts. Frequency response ranges from 20
Hz to 10 kHz. In EME work, the audio millivoltmeter mode is useful in an-
tenna evaluation when comparing sun noise and cold sky noise.
!
Maximum input level is 2000 millivolts rms.
Do not attempt to measure any voltage above 2000 millivolts, es-
pecially 115 Vac or 220 Vac power line voltage! You will damage
the DSP-599zx! ALL WARRANTIES WILL BE VOID!
Function
6
Shift
5
AGC
3
Bypass
Setup
Test
Data
DSP-599zx
CW
Voice
Mode
Rcl/
Store
Spkr/
Chan
1
Random
4
Tone
2
599-081
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 ...
