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Related Manuals for Timewave DSP-9
Summary of Contents for Timewave DSP-9
- Page 1 DSP-9 Audio Noise Reduction Filter Operating Manual Timewave Technology Inc.
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Page 2: Table Of Contents
Table of Contents 1. Introduction to the DSP-9 ............2 2. Specification ................3 3. Installation .................. 4 4. Operation ..................5 5. Troubleshooting ................7 6. Warranty ..................7 7. Schematic Diagram ..............8 Copyright 1994 Timewave Technology Inc. -
Page 3: Introduction To The Dsp-9
5 dB to 20 dB for random noise and up to 50 dB for heterodynes. BANDPASS FILTERS The DSP-9 has bandpass filters that are used in voice and CW modes. In a typical example of a voice mode application, a bandpass filter can improve a signal with a poor signal-to-noise ratio. -
Page 4: Specification
2. SPECIFICATION AUDIO INPUT Impedance 22 Ohms default setting or 10,000 Ohms, jumper slectable AUDIO OUTPUT Speaker output power 1.6 watts into 8 ohms at 13.8 VDC 3.2 watts into 4 ohms at 13.8 VDC Distortion less than 1% at rated output VOICE FILTERS Frequency range Attenuation... -
Page 5: Installation
Figure 3.1. Figure 3.1 POWER SUPPLY The DSP-9 requires a power source of 12 to 16 Volts dc. at 1.0 Amperes. The center pin of the power connector is POSITIVE (+). Acceptable power sources include: 13.8 volt dc. transceiver power supply (recommended power source for the DSP-9 because it is better regulated than most plug-in wall outlet supplies). -
Page 6: Operation
AUDIO OUTPUT The DSP-9 has two audio outputs: 1) On the lower left hand corner of the DSP-9 front panel is a 3.5 mm headphone jack connected for stereo headphones. Use of mono-headphones requires a stereo-to- monaural adapter. The DSP-9 speaker output is muted when a headphone plug is inserted. - Page 7 CW filter bandwidth is 100 Hz., independent of the state of the other button. No matter what the state of the CW filter switch settings on the DSP-9 front panel, one of the six CW filters is always active in the CW mode.
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Page 8: Troubleshooting
One voice bandpass filter is always active in the voice mode. A new feature to V2.0X voice filter firmware is the addition of Automatic Gain Control (AGC) to the NRt algorithm. This feature enhances the ability of the DSP-9 to eliminate weak hetrodynes. 5. Troubleshooting Self-Test The DSP-9 has a self-test feature that verifies proper hardware and firmware operation. - Page 9 DSP-9 is a release earlier than V2.00 (which does not support the self-test) or there is a fundemental prooblem with the processor core of the filter. The DSP-9 self-test is envoked by releasing the bandwidth push-button closest to the volume control during the blinking light sequence.
- Page 10 Audio Circuitry Test This test uses the DSP-9 audio output to generate an audio test tone that can be looped back into the audio input to check the audio levels in the DSP-9. With the DSP-9 powered up and a tone audible at the speaker, disconnect the speaker from the DSP-9.
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Page 11: Warranty
If the DSP-9 does not seem to work correctly after carefully following the installation, operation and troubleshooting instructions in this manual, call, write or FAX the Timewave Customer Service Department for additional help. Timewave Technology Inc. 2401 Pilot Knob Road, St. Paul, MN 55120, U.S.A., North America... - Page 12 The following schematic is the current version of the DSP-9. This circuitry is subject to change without notice.
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