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Timewave DSP-59+, Operating Manual

The Timewave DSP-59+ Operating Manual is a comprehensive user guide for this exceptional product. Available for free download on our website, it provides detailed instructions and insights on using the DSP-59+ efficiently. Get the most out of your device by accessing the manual at manualshive.com.

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DSP-59+

Audio Noise Reduction Filter

Operating Manual

Manual Version 3.1S

Timewave Technology Inc.

Summary of Contents for DSP-59+

Page 1: ...DSP 59 Audio Noise Reduction Filter Operating Manual Manual Version 3 1S Timewave Technology Inc ...

Page 2: ...ectors 2 3 Specification 5 4 Installation 7 5 Operation 9 6 Troubleshooting 16 7 Warranty 19 8 Electromagnetic Interference 20 9 Schematic Diagram 20 10 Appendix Connector Requirements 24 Copyright 1994 1995 Timewave Technology Inc St Paul MN USA 612 452 5939 Manual Rev 3 1 27 June 1995 ...

Page 3: ...hpass and lowpass filters can improve a signal with a poor signal to noise ratio The independent highpass and lowpass filters remove the low and high audio frequency components that do not contribute significantly to the speech intelligibility thus improving signal quality Another common voice mode example is the improvement of a SSB signal corrupted by adjacent channel interference QRM The steep ...

Page 4: ... generator This remodulation process takes place entirely in the DSP 59 The precise clean tones from the RTTY AFSK remodulator can feed any analog multimode controller or TU via the DSP 59 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 Tone or Marke...

Page 5: ...or Voice HP LP mode HP LP uses blue letters Push button in random noise on for CW BP mode BP uses red letters 9 High Pass Center Freq Control Selects the high pass filter in the Voice HP LP mode use blue letters Selects the bandpass filter center frequency for CW and Data modes use red letters 10 Low Pass Bandwidth Control Selects the low pass filter in the Voice HP LP mode use blue letters Select...

Page 6: ...ilters Bandwidth 25 Hz to 600 Hz 60 dB at 50 Hz FIR Linear 30 msec max 15 steps outside the passband phase Center freq 400 to 1000 Hz 50 Hz steps Optional Collins Bandwidth 25 Hz to 600 Hz 55 dB at 75 Hz FIR Linear 18 msec max KWM 2 center freq 1350 1500 or 1750 Hz outside the passband phase S Line filters CW Marker Tone Sine wave at center freq of selected CW filter Sine wave distortion less than...

Page 7: ... Self test Self test for circuitry switches and PTT input User initiated from front panel Test tones Single or two tone Sine wave at the center freq of each highpass and lowpass filter Sine wave distortion less than 1 DIMENSIONS Size 7 6 in wide x 8 5 in deep x 1 9 in high 193 mm wide x 216 mm deep x 48 mm high Weight 2 0 lb 0 9 Kg POWER 12 16 VDC 1A Note RTTY AMTOR PACTOR G TOR and HF Packet data...

Page 8: ... 59 because it is better regulated than most plug in wall outlet supplies Note that some transceivers with internal power supplies have accessory power jacks with insufficient current output to drive the DSP 59 Do not use these internal supplies Radio Shack 273 1653 12 V d c 1 Ampere plug in wall supply Use green tip with center Switching power supplies are generally noisy and not recommended unle...

Page 9: ... On the lower left hand corner of the DSP 59 front panel is a 3 5 mm headphone jack connected for stereo headphones Use of mono headphones requires a monaural to stereo adapter Direct connection of mono headphones will short the DSP 59 audio power amplifier and may damage the DSP 59 The DSP 59 speaker output is muted when a headphone plug is inserted Headphone sensitivity may vary substantially am...

Page 10: ...the DSP 59 and control random noise reduction aggressiveness The push buttons select the operating modes of the DSP 59 Note that depressing a push button always selects the mode indicated below the push button Also note that if the Bypass push button is depressed other controls will have no effect on the operation of the DSP 59 Power Switch Gain Adjust Control The gain knob on the front panel of t...

Page 11: ...om the 6 o clock position When High Pass control is moved to turn off the VNR mode the noise reduction aggressiveness will remain at its last setting until it is changed or the DSP 59 is turned off Voice Bypass Mode Depressing the Bypass push button places the DSP 59 into a bypass mode In this mode a relay connects the audio input jack of the DSP 59 directly to the speaker and headphone output jac...

Page 12: ...ntrol to the desired bandwidth indicated by the red numbers around the Bandwidth control One bandpass filter is always active in BP mode To activate random noise reduction depress the push button marked NRr Random noise reduction and bandpass filtering can operate simultaneously or independently Just depress the desired combinations of push buttons CW Operating Hint The extremely narrow linear pha...

Page 13: ...One bandpass filter is always active in BP mode The random noise reduction mode was not designed to aid data signals but DSP 59 users have found it helpful under some conditions Generally do not use the NRr mode with the BP mode for data If noise conditions are severe and you have tried all other filter combinations then try the NRr and BP mode simultaneously To activate random noise reduction dep...

Page 14: ...cies 1700 Hz factory setting 1300 Hz 1360 Hz 1530 Hz and 2125 Hz There is only one Option position on the Center Freq control so only one preset filter is available from the entire option set data and CW filters RTTY Remodulator To select the RTTY remodulator first chose a RTTY filter by setting the Center Freq control to 2 21k red letters or Option red letters to select a RTTY filter center frequ...

Page 15: ...uction manual and the DSP 59 Back Panel Jumper table on page 16 of this manual Note that some receivers do not have specific provisions to use their narrow 200 600 Hz wide filters for data Operate these radios in their SSB voice filter bandwidth Other receivers may have fixed or variable mark space frequencies check your operating instructions carefully The Kantronics KAM usually has the HF Packet...

Page 16: ...ilters Releasing the Tone push button immediately restores the CLOVER SSTV and WEFAX filters to normal operation Data Bypass Mode Depressing the Bypass push button places the DSP 59 into a bypass mode In the data mode the bypass mode routes the signal through an allpass DSP filter which has precisely the same delay as the normal narrow band filter When switching from data mode to bypass mode this ...

Page 17: ...00 Hz Center Freq Data Option 4 x x x x off off on on 1530 Hz Center Freq Data Option 5 x x x x on on off on 2125 Hz Center Freq Data Option 6 x x x x off on off on 1350 Hz CW Collins Option 7 x x x x on off off on 1500 Hz CW Collins Option 8 x x x x off off off on 1750 Hz CW Collins Option 9 x x x x on on on off 300 2700 Hz Marker 1 0 kHz Option 10 x x x x off on on off 300 2700 Hz Marker 1 0 kHz...

Page 18: ...ut Remove the back bezel and the back panel to reach the internal jumpers located behind the back panel Do not remove the front metal panel or the circuit board from the DSP 59 2 Connect a RCA phono plug to RCA phono plug jumper cable from the audio input jack to line output jack 3 Connect the DSP 59 power input jack to a 12 16 VDC 1 Amp power supply 4 Connect a 4 8 ohm speaker to the speaker outp...

Page 19: ...h receiver audio output level control until the Normal LED flashes 3 Bypass the DSP 59 by turning it off Verify the audio level out of the radio by listening to the speaker If nothing is heard plug a set of stereo headphones into the front panel headphone jack If no audio is heard in the headphones or speaker check audio input connections from the receiver s external speaker output to the DSP 59 M...

Page 20: ... due to defects in materials and workmanship If Timewave receives notice of such defects during the warranty period Timewave shall at its option either repair or replace software media or firmware which do not execute their programming instructions due to such defects Timewave does not warrant that operation of the software firmware or hardware shall be uninterrupted or error free The warranty per...

Page 21: ...tial installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television which can be determined by ...

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Page 25: ...CA phono jack a 1 8 phone plug or bare tinned wires Multimode Data Converter and Terminal Units TU Data devices use a wide variety of connectors including phone jacks RCA phono connectors DIN connectors D subminiature screw terminals and others Consult your owner s manual Transceiver PTT and T R Outputs Transceiver PTT and T R outputs use a wide variety of connectors including phone jacks RCA phon...

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