Timewave DSP-599zx Operating Manual Download Page 27

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DSP-599zx Audio Noise Reduction Filter

March 6, 1997

2-1

Installation

To install a DSP-599zx in a station, the operator must provide power to the
DSP-599zx and make audio input and output connections to the DSP-599zx.
A typical DSP-599zx installation is shown below.

Power

12-16 Vdc

RS-232

Radio A

Radio B

PTT

Input

Audio

Input

Line

Ouput

Speaker

Ouput

Headphones

Timewave Technology Inc.

St. Paul, Minnesota USA.

599-010

Multimode Controller

Rx Audio Input

(PK232, KAM +, or other)

Typical

Transceiver

PTT Out

ANT

Ext Sp

See your Operator Manual

for specific information

about PTT output connections

Speaker

12-16 Vdc 1A

Power

Supply

Center Cond +12Vdc

To Stereo/Mono

Headphones

DSP-599zx

See your Operator

Manual for specific

connector information

March 6, 1997

Summary of Contents for DSP-599zx

Page 1: ...DSP 599zx Audio Noise Reduction Filter Operating Manual March 6 1997 TECHNOLOGY INC ...

Page 2: ...umber is on the bottom of the DSP 599zx It is also stored within the unit and is displayed when you power up your unit Record your serial number on your registration form and here for future reference DSP 599zx Serial Number ________________________ Copyright 1994 1995 1996 1997 2002 by Timewave Technology Inc All rights reserved Printed in USA Under the copyright laws this manual can t be reprodu...

Page 3: ...t is not packed with your DSP 599zx that you will need 12 16 Volt dc power supply capable of providing a minimum of 1 am pere Most commercial power supplies produce 13 8 Vdc and are rated as 12 Vdc Please see page 2 2 for more information Two conductor cable to connect between power supply and DSP 599zx Cables to connect DSP 599zx with your transceiver speaker output PTT output external speaker an...

Page 4: ...TT Input A B Audio Input Line Ouput Speaker Ouput Headphones Timewave Technology Inc St Paul Minnesota USA 599 010 Multimode Controller Rx Audio Input PK232 KAM or other Typical Transceiver PTT Out ANT Ext Sp See your Operator Manual for specific information about PTT output connections Speaker 12 16 Vdc 1A Power Supply Center Cond 12Vdc To Stereo Mono Headphones DSP 599zx See your Operator Manual...

Page 5: ...e DSP 599zx end of the cable 4 Connect a 12 16 Vdc 1 Ampere power supply to the DSP 599zx Use a 5 5 x 2 1 mm power connector on DSP 599zx end of the 12 16 Vdc power cable The center pin must be positive There is a 5 5 x 2 1 mm connector packed with the DSP 599zx manual 5 Turn on the DSP 599zx power volume control right side of front pan el 6 Adjust the radio volume control until the yellow LED on ...

Page 6: ...er frequency at 2210 Hz offset at 170 Hz and baud rate of 45 A channel is active and speaker on Bandwidth has been adjusted wider than normal Function 6 Shift 5 AGC 3 Bypass Setup Test Data DSP 599zx CW Voice Mode Rcl Store Spkr Chan 1 Random 4 Tone 2 599 006 High Pass Center Freq Time Function 6 Shift 5 AGC 3 Bypass Data DSP 599zx CW Voice Mode 1 Random 4 Tone 2 599 007 Setup Test Rcl Store Spkr ...

Page 7: ...iltering Tone noise reduction 1 5 Dual Channel Operation 1 5 Visible Memories 1 6 Automatic Gain Control 1 6 Bypass Control 1 7 Operating Modes 1 7 Voice Mode 1 8 Highpass Lowpass Filters 1 8 Random Noise Reduction 1 8 Adaptive Multi tone and Manual Notch Filtering Tone noise reduction 1 9 CW Mode 1 9 Bandpass Filters 1 9 Random Noise Reduction 1 10 Manual Notch Filtering 1 10 Marker Tone 1 10 CW ...

Page 8: ...Line Output 2 8 PTT Input 2 9 RTTY Modem Input Output 2 10 DIN Jacks Radio A and Radio B 2 10 RS 232 Connector 2 10 Setup Install 2 11 Audio Input Signal Level Setup 2 11 Line Out Signal Level Setup 2 12 Speaker Headphone Routing 2 13 Alternate Channel Gain 2 14 Line Out Routing 2 15 Reset Memory 2 16 Exit Setup 2 16 General Operation 3 1 Introduction 3 1 Front Panel Operation 3 1 Controls Common ...

Page 9: ...W 5 5 Marker Tone Level 5 5 Exit Setup 5 5 Data Mode 6 1 Introduction 6 1 Operations Common To All Data Types 6 1 Basic Data Mode Operation 6 1 Data Settings Display 6 2 Data Tuning Function 6 2 Random Noise Reduction 6 3 Data Bypass Mode 6 3 Data Filter Mode 6 4 RTTY AMTOR SITOR PacTOR G TOR 6 4 HF Packet 6 5 CLOVER 6 5 SSTV and WeFAX 6 5 RTTY FSK Test Signals 6 5 RTTY Modem Operation 6 6 RTTY Re...

Page 10: ...ck and Pin Numbers 7 7 What are CTCSS tones 7 7 CTCSS Tone Frequencies Hz 7 8 Setup Test Instrument 7 8 Default CTCSS Tone 7 9 CTCSS Trigger Threshold 7 9 Signal Generator Calibration 7 10 Millivoltmeter Calibration 7 11 Exit Setup 7 12 Troubleshooting 8 1 Common Problems and Solutions 8 1 Nothing comes on when I turn on the power 8 1 Normal LED does not flash on audio peaks 8 2 Overload LED flash...

Page 11: ...l processor can then modify the digital signal to enhance desired characteristics and to remove undesirable characteristics such as noise The processed signal is converted back to an analog signal and sent on to a speaker headphone or data controller The result is a signal with less noise and or fewer data errors In amateur radio terms DSP is capable of reducing or eliminating QRN noise and QRM in...

Page 12: ... Selectable Automatic Gain Control Configurable bypass control Two selectable input channels Two configurable output channels Six memories for instant recall of user defined configurations Test instrument mode for analyzing signals and other equipment Signal Flow The DSP 599zx converts analog signals into digital signals before it routes and processes them The digital signal processor also control...

Page 13: ...labeled 1 to 6 7 Bypass Switch Press to Bypass DSP filtering 8 Tone Switch Heterodyne elimination for Voice Marker Tone for CW and Data Press Shift Tone to adjust the aggressiveness of the tone notch filter or to activate manually tuned notch filter 9 Random switch Used to turn on random noise reduction Press Shift Random to adjust aggressiveness of the noise reduction 10 AGC switch AGC on 11 Shif...

Page 14: ...audio in PTT out PTT in aux digital in Also con tains connections reserved for future options 5 PTT Input A PTT line from transceiver A PTT output RCA Phono connector 6 PTT Input B PTT line from transceiver B PTT output RCA Phono connector 7 Audio Input A Audio input from radio speaker output channel A RCA Phono connector 8 Audio Input B Audio input from radio speaker output channel B RCA Phono co...

Page 15: ...one filter that can re move multiple tones simultaneously The automatic multi tone filter removes multiple heterodynes almost completely The Center Freq encoder on the front panel tunes the manual notch filter The manual notch filter is selectable and has a dual notch filter for data sig nals and a single notch filter for CW signals and heterodynes Dual Channel Operation The DSP 599zx is a dual ch...

Page 16: ... are preferred over monaural head phones so that you monitor both output channels simultaneously Visible Memories The DSP 599zx has six memories to store complete settings and con figura tions Pressing Shift Store 1 6 stores every setting and setup configuration except the audio gain control position Pressing Rcl in stantly recalls the complete configuration stored in the chosen memory The memory ...

Page 17: ... is turned off bypass leaves it off The speaker will always however come on when pow er is turned off on the DSP 599zx Operating Modes The DSP 599zx has three normal operating modes that operators will most often use Voice CW Data Pressing Mode steps from Voice mode to CW mode to Data mode back to Voice mode in a circular queue There are two more modes that operators will normally use during initi...

Page 18: ...oice mode example is the im provement of a SSB signal corrupted by adjacent channel interference QRM The steep skirts of the highpass and lowpass filters allow the oper ator to minimize or eliminate high side and low side interference indepen dently with minimal impact on the desired signal The DSP 599zx highpass filter adjustment range is from 100 to 1000 Hz and the lowpass range is from 1000 to ...

Page 19: ...rs The DSP 599zx has a fully tunable bandpass filter for use in the CW mode The LCD display shows the center frequency and bandwidth of the filter as the operator tunes with front panel controls Narrow band signals like CW and RTTY require a bandpass filter with steep skirts and linear phase re sponse Linear phase response maximizes the usable signaling rate for a giv en bandwidth and minimizes ri...

Page 20: ...uch as data signals CW signals and heterodynes Usually a narrow bandwidth filter is most effective for the greatest improve ment of a CW signal but some operating conditions i e a contest dictate a wide CW filter bandwidth The manual notch can remove a single strong annoying signal Marker Tone Pressing Tone while in the CW operating mode inserts an audio marker or spotting tone at the center frequ...

Page 21: ...bandpass filters centered at 2210 Hz as well as lower frequencies for European standards and 1600 1800 Hz HF packet The selectable bandwidths of the bandpass filters pro vide optimum filtering for 170 Hz and 200 Hz frequency shift data signals of various baud rates Within setup you can select between European or American standards as your default The DSP 599zx has individual linear phase fixed ban...

Page 22: ...r 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 compu...

Page 23: ... 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 generat...

Page 24: ...uency and amplitude on the LCD display There are two modes of opera tion The first is the autodetect mode which displays the frequency and amplitude of any valid CTCSS tone received The second is the tone squelch mode which detects a selected CTCSS tone and activates a switch output on the DSP 599zx as well as generates a tone on the selected CTCSS frequen cy The audio millivoltmeter function disp...

Page 25: ...Signal Level Line Output Level Speaker Headphone Routing Line Output Routing Alternate Channel Gain Reset Memory Mode Setup Mode specific features need only be set if that particular mode will be used Those features are described in detail in the specific sections describing each mode Voice CW Data Test Instrument Voice AM Line Noise CW Tone Level Data Speaker Mute Bypass Modem Assignment Data Set...

Page 26: ...1 Introduction 1 16 March 6 1997 Default CTCSS Tone About Setup You can find the serial number of the unit and the revision level of the firmware along with the copyright notice in this section ...

Page 27: ... Vdc RS 232 Radio A Radio B PTT Input A B Audio Input Line Ouput Speaker Ouput Headphones Timewave Technology Inc St Paul Minnesota USA 599 010 Multimode Controller Rx Audio Input PK232 KAM or other Typical Transceiver PTT Out ANT Ext Sp See your Operator Manual for specific information about PTT output connections Speaker 12 16 Vdc 1A Power Supply Center Cond 12Vdc To Stereo Mono Headphones DSP 5...

Page 28: ...ower supply be used for the DSP 599zx Switching power supplies are generally noisy and not recommended un less they are specifically designed to drive amateur radio equipment Connecting Cables Use shielded coaxial cables with RCA phono connectors to minimize the possibility of RF interference to the DSP 599zx Timewave recommends coaxial video cables with metal adapters to match the connectors on t...

Page 29: ...ces 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 phono connectors DIN connectors screw terminals and others Consult your transceiver owner s manual Figure 1 show...

Page 30: ...source start with the source connected to the DSP 599zx Channel B input You can configure the DSP 599zx Channels A and B for a high or low input impedance by moving a shorting jumper Input Impedance Jumper Access 1 Loosen the two screws holding each of the bezels in place Slide bezels off the unit 2 Remove four screws holding the front panel in place Carefully discon nect the two ribbon cables fro...

Page 31: ... to a strong signal after setting the radio output gain con trol to a convenient midrange position Adjust the output level control on the radio so the Overload red indicator LED on the front panel of the DSP 599zx occasionally flashes and the Normal yellow indicator LED always flashes with the normal audio input levels Proper adjustment ensures opti mum signal to noise ratio and minimum distortion...

Page 32: ...nel to normal volume This is the factory default setting Putting the jumper across the top pair of pins sets the channel to high volume Putting the jumper vertically over the left pair of pins for each channel sets the channel to low volume The figure below shows jumper configuration for the three choices for setting headphone volume If you are using mono headphones you must set the volume for nor...

Page 33: ...l to the respective audio input levels to the DSP 599zx Input Output Options Within Setup Install you have options for configuring output assignments You will assign speaker headphone separately from line output Turn to page 2 14 for the Setup Install procedure Speaker Headphone The factory default is mono for one radio With this option when you select a radio connected to input A you will hear th...

Page 34: ...ion to configure the line outputs differently from the speak er headphone outputs This is very convenient when using the internal mo dem or when using a multimode controller You can have the speaker headphone outputs configured dual and the line output configured mono For example this would direct the outputs form either selected input chan nel to the multimode controller The factory default is mo...

Page 35: ...ly generated sidetone from your ra dio If you do not use PTT circuit the narrow CW filter within the DSP 599zx may not allow you to hear your sidetone When operating in data mode you will also need the PTT output connected to your rig to allow the RTTY modem to trigger the transmit function on your rig You can program the Push To Talk PTT Inputs to electronically bypass or mute the DSP 599zx in Da...

Page 36: ... circular DIN connectors labeled Radio A and Radio B on the back panel of the DSP 599zx have redundant line outputs audio inputs and PTT inputs They also have connections that are reserved for future op tions These connectors provide an alternate single jack connection for each channel of the DSP 599zx to radio interface When using the internal RTTY modem you will need to use this connector The pl...

Page 37: ... signal level This should not be necessary if you are connected to the speaker output of your receiver This might be necessary if you are connecting a high impedance device such as a tape recorder to the DSP 599zx These usually do not have volume control The range of adjust ment is from 6 0 dBV to 16 5 dBV in 1 5 dBV steps The factory default is 3 dBV 1 Press Shift Mode twice to enter Setup mode 2...

Page 38: ...return to main set up menu Line Out Signal Level Setup You should not need to change the factory default settings If you need to change the settings for some reason do so with some caution The range of adjustment is 3 0 dBV to 24 0 dBV in 1 5 dBV steps The factory default is 3 0 dBV 1 Press Shift Mode twice to enter Setup mode 2 Rotate left knob until QVWDOO appears on the bottom line of the displ...

Page 39: ... mono and dual 1 Press Shift Mode twice to enter Setup mode 2 Rotate left knob until QVWDOO appears on the bottom line of the dis play 3 Press the left knob to select 4 Rotate left knob until 6SNU5RXWLQJ appears on the bottom left of the display 5 Press the left knob to select 6 Rotate left knob until the chosen value appears on the bottom right of the display Your choices are Mono or Dual 7 Press...

Page 40: ...he bottom line of the dis play 3 Press the left knob to select 4 Rotate left knob until OW K DLQ appears on the bottom left of the display 5 Press the left knob to select 6 Rotate left knob until the chosen value appears on the bottom right of the display 7 Press the left knob to accept choice and save Press middle knob to escape without saving changes 8 Rotate left knob until your next function t...

Page 41: ...eft of the display 5 Press the left knob to select 6 Rotate left knob until the chosen value appears on the bottom right of the display Your choices are Mono or Dual 7 Press the left knob to accept choice and save Press middle knob to escape without saving changes 8 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to ...

Page 42: ... left knob until QVWDOO appears on the bottom line of the dis play 3 Press the left knob to select 4 Rotate left knob until 5HVHW 0HPRU appears on the bottom left of the display 5 Press the left knob to select 6 Rotate left knob until the chosen value appears on the bottom right of the display Your choices are USA or EUR 7 Press the left knob to accept choice and save Press middle knob to escape w...

Page 43: ...SP 599zx The operator can also use the left knob to make a selection from a menu or change a variable Rotate the left knob to view the selections and press the knob to select your choice In most situations pressing the middle knob deactivates temporary settings It is also used to escape from menus without making a selection You can think of the pressing the button middle knob as pressing an Esc Ca...

Page 44: ...t Random or Shift Function The availability of any of these and response vary depending upon many factors including operating mode See mode specific sections for information If you press the Shift key and decide not to complete the shift operation pressing the Shift key a second time before pressing another key will can cel the shift operation If a mode or operating feature does not require a shif...

Page 45: ...lter to Voice mode with a wide filter for AM Switching back to channel A changes everything back to CW mode again Memory Operation Rcl Store To store a setting in memory press Shift Store a digit in the range 1 to 6 printed in yellow letters above the corresponding key Function 6 Shift 5 AGC 3 Bypass Data DSP 599zx CW Voice Mode 1 Random 4 Tone 2 599 031 Setup Test Rcl Store Spkr Chan High Pass Ce...

Page 46: ...tore the memory 3 setting Each time Rcl Rcl is pressed the two settings will be swapped This is a good way to compare two settings or switch quickly between two settings The memory number is displayed in the top left position on the display when you recall a configuration from memory An asterisk is displayed next to the memory number if you make any changes to the configuration after recalling the...

Page 47: ...e The speaker will be on when DSP 599zx power is off The Data mode has a special electronic bypass mode for data link integrity described in the Data Mode section on page 6 3 Automatic Gain Control AGC The AGC feature helps maintain a constant output level when the input level varies The obvious use of the AGC feature is to keep the DSP 599zx output level when input signal levels vary rapidly as a...

Page 48: ...C induced modulation Ex periment with changing the receiver AGC setting from Fast to Slow Slow to Fast or even turning off the receiver AGC Try the same changes if Pumping of the signal levels occurs as a result of AGC interaction be tween the receiver AGC and the DSP 599zx AGC when listening to normal signals Leaving the AGC on all the time is not necessarily the best solution You will find situa...

Page 49: ... Hz Lowpass filters tune from 1000 to 5000 Hz Turn High Pass to the desired frequency indicated by the numbers in the lower left side of the display Turn Low Pass to the desired frequency indicated by the numbers in the lower right side of the display These two settings customize the frequency response of the DSP 599zx High Pass Low Pass Hint Set the Highpass Filter to 300 Hz and the Lowpass filte...

Page 50: ... noise blanker and the DSP 599zx Random mode together This can be a very effective noise reduction method for impulsive power line noise Set the receiver noise blanker to remove the high amplitude noise spikes and the DSP 599zx to remove the remaining noise An advantage of this combination is the ability to reduce the noise blanking settings of the re ceiver to minimize the blanking distortion cau...

Page 51: ...AM Line Noise Filter function is active The aggressiveness value can be adjusted from one to nine with a default value of five The higher the aggressiveness value is set the greater the noise reduction Pressing the left knob or pressing Shift Function again stores the new value and returns the DSP 599zx to its normal operating mode with the AM Line Noise Filter activated The noise reduction aggres...

Page 52: ...The top line of the liquid crystal display shows 9 5 9 1and the bottom line displays the relative amount of noise reduction aggressiveness while the automatic tone notch filter function is active Rotate the left knob to adjust the amount of noise reduction The aggressiveness value can be adjusted from one to nine with a default value of five The higher the aggressiveness value is set the greater t...

Page 53: ... notch filters Number six through nine are dual notch fil ters separated by 180 Hz for filtering out interfering data signals As a reminder a 6 or will be displayed in the bottom right corner of the dis play to remind you if you have a single or dual notch filter After tuning the filter to the desired center frequency and adjusting the bandwidth push the momentary switch built into the left knob F...

Page 54: ...in bypass the settings of the all other controls do not affect the signal Bypass respects the status of the speaker switch If the speaker is turned off bypass leaves it off The speaker will always however come on when pow er is turned off on the DSP 599zx Setup Voice There is one user adjustable variable within this mode of setup 1 Press Shift Mode twice to enter Setup mode 2 Rotate left knob unti...

Page 55: ...il the chosen value appears on the bottom right of the display 7 Press the left knob to accept choice and save Press middle knob to escape without saving changes 8 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to main set up menu Exit Setup When you are through with Setup press Mode to return to Voice mode Function...

Page 56: ...4 Voice Mode 4 8 March 6 1997 ...

Page 57: ...z Center frequencies from 200 to 2100 Hz The narrow filters are useful for trying to dig out extremely weak signals from the noise and QRM The wider filters allow easy tuning and listening to multiple CW signals simultaneously In the CW Bandpass mode the DSP 599zx tailors the audio input using tun able bandpass filtering adaptive random noise reduction and manual notch filtering These functions ca...

Page 58: ...pecially 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 heterody...

Page 59: ...er frequency This feature works well with receivers that have non adjustable relatively high pitch CW tone since most hams prefer to lis ten to 400 600 Hz CW tones Press Shift Function to enable CW Pitch shift Rotate the left knob Center Freq to shift the output CW pitch that you hear As soon as you start turning the knob you will notice that an up down arrow will replace the colon following Rotat...

Page 60: ...e pitch shift press Shift Function Then press middle knob to deactivate CW Bypass Mode Press Bypass to place the DSP 599zx into a bypass mode In this mode a relay connects the audio input jacks of the DSP 599zx directly to the speaker line and headphone output jacks The Bypass mode has prece dence over the CW mode When the DSP 599zx is in bypass the settings of the all other controls do not affect...

Page 61: ...ars on the bottom left of the display 2 Press the left knob to select 3 Rotate left knob until the chosen value appears on the bottom right of the display 4 Press the left knob to accept choice and save 5 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to main set up menu Exit Setup When you are through with Setup pr...

Page 62: ...5 CW Mode 5 6 March 6 1997 ...

Page 63: ...t keyed signals A third option within Data mode is the RTTY remodulator mode This is a special receiving mode that regenerates the data tones to send them to an ex ternal modem Configuration of the RTTY modem is done as part of Setup Data You can choose to have channel A line output function as a the RTTY modem output or have channel B function as the RTTY modem output The RTTY remodulator is sele...

Page 64: ...Adjust the receiver frequency so that the Mark and Space bars on the display are approximately equal length Press Function to switch the middle knob from Bandwidth to DCD Data Carrier Detect Turn middle knob DCD for clean error free copy on your terminal dis play The DCD setting with a range of 1 9 is displayed on the lower right corner of the display When a data carrier is detected that exceeds t...

Page 65: ...is prevents a time dis continuity that can cause an AMTOR or PacTOR link to lose synchroniza tion The bypass mode has precedence over the Data mode When the DSP 599zx is in bypass the settings of the gain control and the parameter select push buttons do not affect the signal Bypass respects the status of the speaker switch If the speaker is turned off bypass leaves it off The speaker will always h...

Page 66: ...urope The defaults used in your DSP 599zx can be chosen from within Setup Install Center Freq Freq Shift Baud Rate Comments RTTY 2210 170 45 RTTY 2 2210 200 45 AMTOR 2210 200 100 Same filters as SITOR PacTOR 2210 200 200 100 200 adaptive G TOR 2210 170 300 100 200 300 adaptive HF Packet 1700 200 300 PK 232 2210 Hz CF WeFAX Fixed Fixed Fixed HF only filter only SSTV Fixed Fixed Fixed Filter only CL...

Page 67: ... that toggles at the specified baud rate It is not a standard ASCII character Pressing Shift Tone while in the Data RTTY mode at 75 baud or less in serts an RYRY audio FSK test signal into the receive channel The RYRY test signal center frequency frequency shift and baud rate is de termined by the RTTY parameter settings The level of marker tone is ad justable relative to the processed receive sig...

Page 68: ...h Press Function to switch the middle knob from Bandwidth to DCD Data Carrier Detect Turn middle knob DCD for clean error free copy on your terminal display The DCD setting with a range of 1 9 is displayed on the lower right corner of the display When a data carrier is detected that exceeds the DCD setting an asterisk is displayed next to the DC setting 7 is displayed when the terminal program is ...

Page 69: ...ing an external multimode controller Press Mode to select the Data mode Turn the left knob to select the appropriate RTTY data filters Press Function to select the remodulator The middle knob now adjusts the DCD threshold The LED illuminated next to the Function button indicates the RTTY re modulator is selected The DSP 599zx filters and demodulates the received RTTY signal Then The DSP 599zx gene...

Page 70: ...ays The most common specification in amateur radio is total shift or the difference between the low Mark and high Space tones In the technical literature the shift from a center frequency is more commonly specified For example a 170 Hz shift RTTY signal is the same as a 85 Hz shift Note the frequency shift re mains the same whether it is shifting an RF signal or an audio frequency sig nal In amate...

Page 71: ...ers and in different parts of the world Some modems have default HF Packet mark space center frequencies dif ferent from their RTTY AMTOR and PacTOR mark space center frequen cies The DSP 599zx mark space center frequency factory setting is 2210 Hz for RTTY AMTOR G TOR and PacTOR data modes The DSP 599zx HF Packet mark space center frequency factory setting is 1700 Hz The mark space center frequen...

Page 72: ... appears on the bottom line of the display 3 Press the left knob to select 4 Rotate left knob until 7 6SNU HY appears on the bottom left of the display 5 Press the left knob to select 6 Rotate left knob until the chosen value appears on the bottom right of the display 7 Press the left knob to accept choice and save Press middle knob to escape without saving changes 8 Rotate left knob until your ne...

Page 73: ...ur choices are or 7 Press the left knob to accept choice and save Press middle knob to escape without saving changes 8 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to main set up menu FSK Mark Control With some transceivers the normal configuration for Mark within the FSK signal be reversed and not adjustable Stan...

Page 74: ...cting 2Q will list the data op erating mode as a choice while in Data Mode The status is displayed in the upper right corner of the display Selecting 2II will remove the data oper ating mode from the menu while in data mode For the data operating modes that have user configurable information you can configure the following Mark Space Center Frequency Mark Space Shift Frequency Baud Rate Bandwidth ...

Page 75: ...ate left knob until the desired data operating mode appears on the bottom right of the display 7 Press the left knob to select 8 Rotate the middle knob until the flashing cursor appears on the first character of the parameter you would like to change Rotate left knob until correct value appears 9 Rotate the middle knob gain until the flashing cursor appears on the first character of the next param...

Page 76: ... 11 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to main set up menu Exit Setup When you are through with Setup press Mode to return to Voice mode ...

Page 77: ...measures audio voltage levels from other equipment including microphones TNCs multimode controllers and receivers Measurements include both peak and true RMS millivolts Frequency response ranges from 10 Hz to 10 kHz The audio millivoltmeter has many applications in installation mainte nance and operation of radio and audio equipment In EME work the audio millivoltmeter is useful in antenna evaluat...

Page 78: ...to 20k ohms Channel A is factory set to 25 ohms See page 2 4 for setup information changing input impedance Press Spkr to turn the speaker on to listen to the input signal on the selected channel Press Mode to exit Test Instrument mode Press the middle knob to escape back to the test function menu Maximum input level is 2000 millivolts rms Do not attempt to measure any voltage above 2000 millivolt...

Page 79: ...ress Tone to start generator Turn left knob to set frequency Press Function to select input signal amplitude units P9UPV or P9SN Turn middle knob to set output amplitude shown on lower right of dis play Press Tone again to turn off generator Press Mode to exit Test Instrument mode Press the middle knob to escape back to the test function menu Function 6 Shift 5 AGC 3 Bypass Setup Test Data DSP 599...

Page 80: ...put The amplitudes of the two tones are identical and they track when adjusted Press Shift Mode to enter the Test Instrument mode Turn the left knob to 7RQH Press left knob to select the two tone generator Press Tone to Tone to turn on generator Turn the middle knob to set amplitude shown on lower right of dis play Press Tone again to stop generator Press Mode to exit Test Instrument mode Press th...

Page 81: ... lected CTCSS frequency Output signal voltage is adjustable from 5 50 mV in 1 mV steps and from 50 500 mV in 10 mV steps By design some transceivers filter out low frequencies so that we normally do not hear them The result is low speaker output of CTCSS tones that may not be detected reliably Autodetect Press Shift Mode to enter the Test Instrument mode Turn the left knob to 7 66 Press the left k...

Page 82: ...ut and input CTCSS tone center frequency Turn the middle knob to set the output tone amplitude in volts RMS shown on lower right of display CTCSS Tone Squelch Detection The amplitude of the selected CTCSS input signal is shown on the lower left side of the display Function 6 Shift 5 AGC 3 Bypass Setup Test Data DSP 599zx CW Voice Mode Rcl Store Spkr Chan 1 Random 4 Tone 2 599 051 High Pass Center ...

Page 83: ... signals on repeaters or to allow only desired signals to be heard on direct radio links A selected CTCSS tone mixes with the transmit audio to modulate a transmitted signal When a tone is present on a received signal a CTCSS tone decoder output opens the receiver audio squelch al lowing the incoming signal to be heard The tone frequencies are all below 255 Hz and are usually not audible on most V...

Page 84: ...S tone amplitude than a known good signal or most other signals on the same frequency the CTCSS tone deviation of the received signal is probably set incorrectly Compare only CTCSS tones of the same frequency unless you know the audio output frequency response of your receiver is flat to less than 30 Hz into a 10K load impedance Setup Test Instrument There are eight user adjustable variables withi...

Page 85: ... middle knob to escape without saving changes 8 Rotate left knob until your next function to change appears on the bot tom line of the display or press the middle knob to return to main set up menu CTCSS Trigger Threshold Version 4 firmware only You can adjust the level that the CTCSS tone will trigger the squelch to open The factory default is 20 mV 1 Press Shift Mode twice to enter Setup mode 2 ...

Page 86: ...mode VOM meter such as a Fluke 8060 or equivalent It takes a unit of this caliber to be accurate at the 1 kHz calibration tone Adjust meter to read AC voltage with a range of 0 2 volts 1 Connect a Fluke 8060 or equivalent to channel A line output Set meter to AC volts in the appropriate range to read the required voltage 2 Press Shift Mode twice to enter Setup mode 3 Rotate left knob until 7HVW ap...

Page 87: ...ce See page 2 4 for this procedure 1 Connect jumper cable from Line Output on channel A to audio Input on channel A 2 Press Shift Mode twice to enter Setup mode 3 Rotate left knob until 7HVW appears on the bottom line of the display 4 Press the left knob to select 5 Rotate left knob until GM QS appears on the bottom line of the display 6 Press the left knob to select 7 Rotate left knob until the P...

Page 88: ...7 Test Instrument Operation 7 12 March 6 1997 tom line of the display or press the middle knob to return to main set up menu Exit Setup When you are through with Setup press Mode to return to Voice mode ...

Page 89: ...ntinuity Loosen the two screws holding each of the bezels in place Slide bezels off the unit 5 Remove four screws holding the front panel in place Carefully discon nect the two ribbon cables from the rear of the front panel 6 Remove the four screws holding the rear panel in place 7 Turn unit over and remove the two screws from the bottom of the case 8 Observing static precautions carefully turn un...

Page 90: ...ntrol audio levels into the DSP 599zx are very important for distortion free reception Occasional flashes of the overload LED are usually not a problem No audio output 1 Check power connection to DSP 599zx 2 Increase audio input level with receiver audio output level control until the Normal LED flashes 3 The speaker icon should be visible on the top line of the display If it is not visible press ...

Page 91: ...r carefully following the installation operation and troubleshooting instructions in this manual call write E mail or FAX the Timewave Customer Service Department for additional help Timewave Technology Inc 501 W Lawson Ave St Paul MN 55117 U S A Phone 651 489 5080 FAX 651 489 5066 E mail sales timewave com Web http www timewave com ...

Page 92: ...8 Troubleshooting 8 4 March 6 1997 ...

Page 93: ...ted bandpass filter Up to 50 dB varies with noise characteristics manual Note The random noise reduction and bandpass filters can operate simultaneously The random noise reduction tone notch and highpass lowpass filters can operate simultaneously CW FILTERS CW filters Bandwidth 5 Hz to 600 Hz 10 Hz steps Center freq 200 to 2150 Hz 5 Hz steps 55 dB at 60 Hz outside the passband FIR Linear phase BW ...

Page 94: ...W and Data Modes 18 dB SIGNAL PROCESSING A D D A Converter 16 bit linear sigma delta conversion dual channel Signal Processor 16 bit 27ns Analog Devices ADSP 2181 with 80 KB of memory TEST INSTRUMENT MODE Audio Gener ator Single Two tone Version 4 firmware only single Sine wave tunable from 20 Hz to 10 kHz Two tone fixed 700Hz and 1900Hz Version 4 firmware only Sine wave distortion less than 1 Aud...

Page 95: ... cuit to allow data to flow through FSK Frequency Shift Keying A common RTTY mode most often used for HF com munications The signal is generated by switching a HF carrier between two separate frequencies G TOR A data mode that use several compression checking or correction techniques besides automatic repeat re quests Faster than either AMTOR or PacTOR Heterodyne The combining of two different fre...

Page 96: ...Appendix B Glossary A 4 March 6 1997 ...

Page 97: ...tion 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 firm ware or hardware shall be uninterrupted or error free The warranty period for each product is one year from date of shipment Limitation of Warranty The foregoing warranty shall not apply to defects resulting f...

Page 98: ...Appendix C Product Warranty A 6 March 6 1997 ...

Page 99: ...ence in a residential installation This equipment generates uses and can radiate radio frequency energy and if not in stalled 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 installa tion If this equipment does cause harmful interference to radio or television which ca...

Page 100: ...Appendix D Electromagnetic Interference A 8 March 6 1997 ...

Page 101: ...eduction Filter March 6 1997 A 9 Appendix E Schematic Diagrams The schematic diagrams in this manual may differ slightly from any partic ular DSP 599zx Timewave reserves the right to make changes in the DSP 599zx at any time ...

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 ...

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