Timewave DSP-599zx Features

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Page 1

DSP-599zx

Audio Noise

Reduction Filter

Features

Revision 1.1

TECHNOLOGY INC.

Page 2

Congratulations

You are reading about the most advanced digital signal processor available. Timewave Technology Inc. occasionally offers performance enhancing up dat es to its pr oduct s. Upda tes a nd cor r ections to infor mat ion and s pecifications will b e ma de t o this F eatu res M anual when needed.



Printed in USA Under the copyright laws, this manual can’t be reproduced in any form

withou t prior writ ten per mis sion from Timewave Technology Inc. Timewave Technology Inc. strives to deliver the best product to our

cus tomers. As par t of this goal, we a re cons tantly trying t o improve ou r pr oduc t s. Timewave Technology Inc., t her efor e, r es erves t he r ight to ma ke changes to produc t sp ecif ic at ions or doc umentation withou t prior notice.

This Features manual may contain errors, omissions or “typos.” Please send your comments, suggestions a nd c orr ec tions:

Timewave Technology Inc. 2401 Pilot Knob Road St. Paul, MN 55120 USA

[email protected] E-mail http://www.timewave.com FAQ and Informa tion

(612)452-5939 Voice (612)452-4571 Fax

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Controls

Spkr/Chan

Rcl/Store

Mode

Data

Voice

DSP-599zx

Front Panel

Test

Setup

Timewave DSP-599zx Audio Noise Reduction Fi lter

PTT

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

Overload Normal

Off

Gain

599-002

1. PTT/Overload LED

Red LED indicates a too high signal level into DSP-599zx from receiver. When PTT line from transceiver is connected, red LED on indicates PTT is activated.

2. Normal

Yellow LED indicates normal signal level into DSP-599zx.

3. Mode sw itch

Press to change mode (Voice, CW, Data). Press

[Shift+Mode]

to switch to Setup and Test modes.

4. Voice, CW, Data, Test, and Setup LEDs.

Indicate the selected mode of the DSP-599zx.

5. S pkr/Chan swi tch

Press to toggle speaker on and off. Press

Mode]

to switch from Channel A input to

Channel B input.

[Shift+

6. Rcl/Store switch

To recall memory, press this key and then one of the switches labeled 1 to 6. To store current settings in a memory, press

[Shift+Rcl/Store]

then one of the switches 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

Tone]

to activate manually tuned notch filter.

[Shift+

9. Random switch

Used to turn on random noise reduction. Press

[Shift+Random]

to activate variable noise

reduction.

10. AGC switch

AGC on.

11. Shift switch

This blue switch shifts the function of the next switch pressed to its function labeled in blue.

12. Function switch

This switch is used to enter into menus and other specialized functions.

13. High Pass/Center Freq Control

Tunes the high pass filter in the Voice mode. Tunes the bandpass filter center frequency in CW and Data mode. In most menu modes, this knob is rotated to see menu choices. Pressing the knob to selects the choice.

14. Low Pass/Bandwidth Control

Tunes the low pass filter in the Voice mode.

Tunes the bandpass filter bandwidth for CW and Data mode. Pressing knob will turn off temporary settings.

15. Gain/Power On/Off

Turns power on and off, and volume control for speaker output.

16. LCD Display

Backlit 2x16 alphanumeric display of mode, control, and test settings and data.

Features Version 1.1 3

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Connectors

Timewave Technology Inc.

St. Paul, Minnesota USA.

Timewave DSP-599zx Audio Noise Reduction Fi lter

Power

12-16 Vdc

RS-232

Radio A

Back Panel

1. Power In

12-16 Volts DC Use 5.5 mm/2.1 mm matching plug, center positive.

2. RS-232

RS-232 compatible RTTY modem serial output for computer interface. DB-9F connector. Refer to chapter 2 for pin configuration.

3. Radio A

Alternative single 8 pin DIN connection for line out, audio in, PTT out, PTT in, aux. digital in. Also contains connections reserved for future options.

4. Radio B

Alternative single 8 pin DIN connection for line out, audio in, PTT out, PTT in, aux. digital in. Also contains 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.

Radio B

PTT

Input

Audio

Input

Line

Ouput

Speaker

Ouput

Headphones

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 connector.

9. L i ne Output A

Line level output to multimode data controller channel A. Gain control doesn’t vary this output. RCA Phono connector.

10. Line Output B

Line level output to multimode data controller channel B. Gain control doesn’t vary this output. RCA Phono connector.

11. S peaker Output A

4-8 ohm speaker output - channel A. RCA Phono

connector.

12. S peaker Output B

4-8 ohm speaker output - channel B. RCA Phono

connector.

13. Headphone Jack

Stereo headphone jack for 1/4” stereo plug.

599-005

Features Version 1.1 4

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Timewave DSP-599zx Audio Noise Reduction Fi lter

Typical

Transceiver

ANT

See your Operator Manual

for specific information

about PTT output connections

PTT Out

Ext Sp

Timewave Technology Inc.

St. Paul, Minnesota USA.

Power

12-16 Vdc

Center Cond +12Vdc

RS-232

12-16 Vdc 1A

Power

Supply

DSP-599zx

Radio A

Multimode Controller

Radio B

(PK232, KAM +, or other)

connector information

PTT

Audio

Input

See your Operator

Manual for specific

Line

Ouput

Speaker

Headphones

Ouput

Rx Audio Input

To Stereo/Mono

Headphones

Speaker

Consult the installation section of this manual for more information on cables a nd c onnec tions.

Features Version 1.1 5

599-010

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Voice Mode

CW Mode

Timewave DSP-599zx Audio Noise Reduction Fi lter

Mode

Spkr/Chan

Rcl/Store

Voice

DSP-599zx

TestData

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-006

Typical display for Voice mode, 300 Hz to 2700 Hz filter, A channel active and s peaker on.

Data Mode

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-007

Typical display for CW mode, Center Frequency at 800 Hz and Bandwidth set to 100 Hz filter, A channel active and speaker on.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

Typical display for RT TY Data mode. Center frequency at 2210 Hz, offset at 170 Hz and baud rate of 45. A channel active and speaker on.

Features Version 1.1 6

599-029

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Timewave DSP-599zx Audio Noise Reduction Fi lter

DSP-599zx Introduction

The previous section includes a short summary of both the front panel controls and the rear panel connectors. Please see

Specifications

cap abilities of the DSP - 599zx.

Digital Signal Processing

igital Signal Processing (DSP) is a powerful and complex method of ana lyzing and modifying ana log signals . Audio s ignals like speech or r adio data are analog signals. The speech and data signals have fairly well known and predictable characteristics; however, these characteristics are quite complex. By converting the analog signal to a digital signal, a powerful digital signal processor with a special program can analyze the characteristics of the analog signal. T he digital signal processor can then modify the digital signal to enhance desired characteristics and to remove undesir ab le char a cter ist ics s uch a s nois e. T he pr ocessed s ignal is convert ed back to an analog signal and sent on to a speaker, headphone, or data contr oller. The resu lt is a signa l with less noise a nd/or fewer da ta err or s. I n amateur radio terms, DSP is capable of reducing or eliminating QRN (noise) and QR M (int erferenc e).

at the rear of this document for detailed informat ion on the

DSP-599zx

For a more deta iled dis cu ss ion of digit a l s igna l process ing, cons u lt t he most recent

ARRL Handbook

Features Version 1.1 7

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DSP-599zx Overview

The DSP-559zx is an extraordinarily versatile digital signal processor designed for amateur a nd shortwave radio voice, data and CW operation. The DSP-599zx uses advanced digital signal processing technology to implement algorithms t hat p erform five basic a u dio funct i ons:



The DSP-599zx combines these five basic functions to reduce noise and interference and improve radio communication. The DSP-599zx hardware and softwar e architecture allow easy field upgrade with new features and algorithms. The same hardware and software architecture also allow ergonomic mode oriented operation of the DSP-599zx. The LCD alphanumeric dis pla y pr ovides a clear view of op era ting set tings when s witching between operating modes. The quick-select push buttons and optical encoders for filter tuning allow ins ta nt mode change wit h tota l r ecall of las t setting and memories. Front-panel selectable and adjustable inputs allow you to quickly setup and adjust your DSP-599zx to wipe out noise and QRM like never before!

Timewave DSP-599zx Audio Noise Reduction Fi lter

Ra ndom nois e reduct ion Adap tive multi-tone and manu al notch filtering (Tone noise reduction) Bandpass/Highpass/Lowpass filtering Signal generation inclu ding FSK RTTY modula tion Signal detection and measurement inclu ding RTTY demodulation

Here ar e a few more highlight s a mong the many ot her oper a ting fea tu r es of the DSP-599zx:

Selectable Automa tic Ga in Control



Configurable bypass control



Two selectable inp u t channels



Two configurable output channels



Six memories f or instant recall of user - defined conf igurations



Test inst rument mode for ana lyz ing signals and ot her equipment



Features Version 1.1 8

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Signal Flow

The DSP-599zx converts a nalog s igna ls into digit al s igna ls b efore it r out es and processes them. The digital signal processor also controls the front panel switches, encoders , LEDs, LCD display, and ba ck panel inp uts a nd outputs. This figure is a greatly simplified block diagram of the DSP599zx.

Channel A Input

Channel B Input

Timewave DSP-599zx Audio Noise Reduction Fi lter

Timewave DSP 599zx

Front Panel Controls

and Display

Speaker

Chan

}

Chan

}

DSP

Circut

Headphones Line Out

Line Out Headphones

Speaker

PTT

I/O

Data

I/O

DB-9

Connector

599-013

Features Version 1.1 9

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Timewave DSP-599zx Audio Noise Reduction Fi lter

Features Common to All Modes

Voice

Mode

Spkr/Chan

Rcl/Store

Random/Tone Noise Reduction

The noise reduction functions of the DSP-599zx operate by examining a characteristic of signals and noise called filtering out the undesired signals and noise. The degree of correlation is rela tive. R a ndom noise su ch a s whit e noise or st a t ic is u ncor r ela t ed. S p eech is moderately correlated. Repetitive or continuous noise such as a heterodyne is highly corr elat ed. The DS P-599zx measures correlation and filter s out si gnals and nois e that a re outs ide its corr elation t hresholds. The amount of noise r educ tion var ies a c cor ding t o the c or r elat ion c ha r a ct er is tic s of the noise. Typica l nois e r educ tion ra nges fr om 5 dB t o 20 dB for r a ndom noise and up t o 50 dB for heterodynes.

TestData

Setup

DSP-599zx

Bypass

AGC

Shift

Tone

Random

Function

High Pass

Center Freq

correlation,

Time

599-006

and dynamically

Adaptive Multi-tone and Manual Notch Filtering (Tone noise reduction)

The DSP-599zx has both an automatic notch filter and a manually tuned filter. The automatic notch filter is an adaptive multi-tone filter that can remove multiple tones simultaneously. The automatic multi-tone filter removes multiple heterodynes almost completely. The encoder on the front panel t unes the ma nual not ch filter. T he manua l notch filter is selectable and has a wide bandwidth filter for data signals and a narrow b andwidth f ilter for CW signals and het erodynes.

Dual Channel Operation

The DSP-599zx is a dual channel device with two sets of inputs and outputs. The DSP circuit completely processes the selected channel, while signals on the other channel pass through the DSP circuit without pr ocessing. Set tings for each channel a re ret ained when switching bet ween channels.

The two input cha nnels a llow you to c onnect eit her t wo sep a r a te r a dios or a dual channel radio with two outputs to the DSP-599zx. You may configure each channel to completely differ ent opera ting modes. Selecting the opposite channel returns the DSP-599zx to the previous settings on that channel.

[Center Freq]

Features Version 1.1 10

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Timewave DSP-599zx Audio Noise Reduction Fi lter

This is very handy for t wo rig opera tions when setting one rig to monitor CW and the other to monitor voice.

Mode

Spkr/Chan

Rcl/Store

Voice

DSP-599zx

TestData

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-032

Pressing

[Shift+Chan]

599zx audio gain control simultaneously controls volume level of both channels.

Setup

channel with respect to the B channel.

Setup

mode also allows you to configure the two output channels independently. It is possible to configure the Line Out for each channel differently from the external speaker and headphone outputs. This can be very convenient when working in one of the D at a modes. T he Line Ou t ca n then be connect ed t o a multi-mode cont roller.

The DSP-599zx requires external speakers and/or headphones to hear the audio signal. The DSP-599zx will accept either s t ereo or mono head- phones with a 1/ 4” plug. Ster eo headphones a re the p referr ed over monau ra l headphones so that you monitor both output channels simultaneously.

Visible Memories

The DSP-599zx has six memories to store complete settings and configur at ions. P ress ing and setup configuration except the audio gain control position. Pressing

[Rcl+{#}]

stored in a memory a nd displays them on the L CD.

instantly recalls the complete settings and setup configuration

toggles between channels A and B. The DSP-

mode allows adjustment of the relative volume of the

[Shift+Store+{# }]

(# = 1-6 ) st ores every s ettin g

Features Version 1.1 11

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-016

Page 12

Timewave DSP-599zx Audio Noise Reduction Fi lter

Automatic Gain Control

The DSP-599zx has switch-selectable automatic gain control to optimize the signal levels for best filter performance and to enhance listening by minimizing audib le s ignal level var i ation.

Bypass Control

The DSP-599zx has bypass features that vary with the mode of operation. In voice and C W modes, t he bypas s set ting rou tes t he signal throu gh rela y contacts to completely bypass the electronic circuitry of the DSP-599zx. Turning the power off to DSP-599zx uses the same relay bypass method. In dat a mode, the bypass route is t hrough the D SP pr ocessor. T he amount of signal delay through the bypass route is equal to the delay through the processed signal route. The purpose of this delay equalization is to allow switching between signal processing and bypass without breaking the hands haking link of modes like PacTO R and G -TOR.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-061

Bypas s resp ects the sta tus of t he spea ker swit ch. I f the sp eaker is t urned off, b ypass leaves it off . The s peaker will a lways, however, come on when power is turned off on the DSP-599zx.

Features Version 1.1 12

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Operating Modes

Timewave DSP-599zx Audio Noise Reduction Fi lter

The DSP-599zx has three normal operating modes that operators will most often u se:

Voice









Data



Pressing Voice mod e i n a ci rc ular q ueue.

There are two more modes that operators will normally use during initial configuration, insta llation, a nd trou bleshooting,

Set-up



Test



Pressing

[Shift+Mode]

pla ces t he unit b a ck in one of t he nor mal op er a t ing modes a ga in. When in a menu or t est inst ru ment mode, pres sing the one level. Think of the button.

Voice Mode

The Voice Mode digita lly processes all a nalog voice signals for all modes including SSB, AM, FM, and PM. Independently selectable processing techniques include noise reduction, heterodyne elimination, tunable highpa ss/lowpas s filtering and aut omatic gain cont rol.

[Mode]

[Shift+Mode]

step s fr om Voice mode to CW mode to D ata mode bac k to

once places the DSP-599zx in Test mode. Pressing

again steps to Setup mode. Pressing

middle button

[Mode]

middle knob

at any time

will back you u p

in most cases as a cancel/clear

Features Version 1.1 13

Mode

Spkr/Chan

Rcl/Store

Voice

DSP-599zx

TestData

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-006

Page 14

Timewave DSP-599zx Audio Noise Reduction Fi lter

Highpass/Lowpass Filters

The DSP-599zx has highpass and lowpass filters that are independently tunable with front panel controls. The LCD display shows the corner frequencies of the filters as they are tuned. There are many uses for the variable combinations of highpass and lowpass filters that the DSP-599zx offers. In a typical example of a voice mode application, highpass and lowpa ss filter s can impr ove a signa l with a poor signal- to-noise ra tio. T he 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 S SB s ignal cor r upt ed by a djacent cha nnel interference (QRM). The steep skirts of the highpass and lowpass filters allow the operator to eliminate high side and low side interference independently with minimal impact on the desir ed s ignal.

The DSP-599zx highpass filter adjustment range is from 100 to 1000 Hz and the lowpass range is from 1000 to 5000 Hz. Although the DSP-599zx has bandpass filters for CW and the most common data modes, the selectable highpass and lowpass filter combinations also allow precise filter ing f or modes su c h as wideshif t RTTY.

Random Noise Reduction

The DSP-599zx random noise reduction has pr oven t o be u sefu l in r edu cing a wide variety of noise types, including white noise, line noise and static crashes. The amount of noise reduction varies according to the char a cter ist ics of the noise. Typical nois e reduct ion r anges f rom 5 dB to 20 dB. It is possible to change the level of aggressiveness within a regular operating mode withou t going into s et up mode.

Adaptive Multi-tone and Manual Notch Filtering (Tone noise reduction)

The DSP-599zx has both an automatic notch filter and a manually tuned filter. T he automat ic multi-tone filter removes multiple heterodynes a lmost completely.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Bandwidth

Low Pass

The manual notch filter is selectable for either a wide ba ndwidth for data signals and a narrow bandwidth for CW signals and heterodynes. The center freq uency o f the filter i s ea sily set.

Features Version 1.1 14

599-027

Page 15

CW Mode

The CW Mode digita lly processes ana log CW (Cont inuous Wave) s ignals for Morse code reception. Independently selectable processing techniques include noise reduction, tunable bandpass filtering and automatic gain control.

Bandpass Filters

Mode

Spkr/Chan

Rcl/Store

Timewave DSP-599zx Audio Noise Reduction Fi lter

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-007

The DSP-599zx has a fully tunable bandpass filter for use in the CW mode. The LC D displa y shows the cent er fr equency a nd ba ndwidth of the filt er a s the oper ator tunes with fr ont pa nel contr ols. Na rr ow ba nd signals like CW and RTTY require a bandpass filter with steep skirts and linear phase resp onse. Linea r pha se respons e max imizes the usa ble signa ling ra te for a given bandwidth and minimizes ringing often heard on other extremely sharp crystal and au dio f ilters .

The DSP-599zx CW filter has skirts so steep that a signal literally falls off the edge of the pa ss ba nd as you t une thr ou gh a C W si gnal. Ba ndwidths f or the bandpass filter range from 10 Hz to 600 Hz, and center frequencies range from 200 to 1000 Hz. The narrow filter bandwidths are useful for trying to dig out extremely weak signals from the noise and QRM. The wider filter bandwidth allows easy tuning and listening to multiple CW signa ls simultaneously.

Random Noise Reduction

The DSP-599zx random noise reduction has pr oven t o be u sefu l in r edu cing a wide variety of noise types, including white noise, line noise and static crashes. The amount of noise reduction varies according to the char a cter ist ics of the noise. Typical nois e reduct ion r anges f rom 5 dB to 20 dB. In t he CW mode, ra ndom noise r educt ion is genera lly most effect ive in the wider C W bandwidths (400-600 Hz).

Features Version 1.1 15

Page 16

Timewave DSP-599zx Audio Noise Reduction Fi lter

Manual Notch Filtering

The DSP-599zx has a manually tuned notch filter. The

Center Freq]

[

encoder on the front panel t unes the ma nual not ch filter. T he manua l notch filter has both a wide bandwidth choice for data signals and a narrow bandwidth choice for CW signals and heterodynes. Usually a narrow bandwidth filter is most effective for the greatest improvement 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 or spott ing tone at the cent er frequency of the b andpas s filter. Tuning the bandpass filter center frequency changes marker tone center frequency. Matching the marker tone frequency with the received signal allows switc hing in a nar row filter without los ing the signal outside t he pas sband of the narrow filter. The level of marker tone is adjustable relative to the pr oc es sed receive signal.

opera ting mode inser ts an a udio marker

CW Tone Pitch Shift

A feature unique to the DSP-599zx is the ability to ea sily s hift t he CW t one pitc h t o a nother f r equency. This fea t ure works well wit h r ec eivers t ha t ha ve non-adjustable, relatively high pitch CW tone, since most hams prefer to listen to 400 - 600 Hz CW tones.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

599-014

Features Version 1.1 16

Page 17

Data Mode

The Da ta Mode digit ally p roc esses dat a s ignals inclu ding RTTY, AM TOR , PacTOR, G-TOR, CLOVER HF packet, SSTV and WeFAX. I ndep endent ly selecta ble pr ocessing techniques include noise reduction, tunable bandpass filter ing and automatic gain c ontrol, and a sp ecial RTT Y modem and RTTY remodula tor.

Mode

Spkr/Chan

Rcl/Store

Timewave DSP-599zx Audio Noise Reduction Fi lter

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Time

High Pass

Center Freq

599-029

Bandpass Filters

The DSP-599zx has both fixed and tunable bandpass filters for the data mode. Nar row b and F SK si gnals like RTT Y requir e a b andpa ss filter with steep s kir t s, linea r p ha se r esp ons e, a nd mat ched a mplitu de r es pons e. L inear phas e respons e max imizes the usa ble signaling rat e for a given ba ndwidth and minimizes r inging often hear d on extr emely shar p f ilters . T he mat ched amplitude response tailors the filter to match the selected modulation type and b aud rat e to minimize noise and interfering signals.

The DSP-599zx also has fixed frequency matched ba ndpass filters centered at 2210 Hz as well as lower frequencies for European standards and 16001800 Hz HF packet. The selectable bandwidths of the bandpass filters provide optimum filtering for 170 Hz and 200 Hz frequency shift data signa ls of va rious baud rates.

The DSP-599zx has individual linear phase fixed bandpass filters with steep skirts for SSTV, WeFAX and CLOVER. Since the bandwidths for these modes are fixed, the filters are primarily QRM filters for adjacent channel signals rather than noise reduction filters for eliminating random noise. T he S S T V f ilter is a dual pa s s ba nd filt er with one p a s sb a nd cent ered on the SSTV sync pulse at 1200 Hz, and the other passband around the varying FM picture tones from 1500-2300 Hz. WeFAX is similar to SST V but has no separate sync pulse so the filter bandpass covers 1500-2300 Hz. The CLOVER filter has a 500 Hz bandwidth with a center frequency of 2250 Hz.

Features Version 1.1 17

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Timewave DSP-599zx Audio Noise Reduction Fi lter

Data Tuning Function

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

599-057

Pressing

[Shift+Function]

turns the tuning display on. This display pr ovides inf ormation gra phically to allow p recise 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 designed for dat a signals, but has been field pr oven to be useful for nois e reduc tion under s ome conditions. I t is u sua lly most effective for 45. 5 b aud RTTY signals.

RTTY Modem

The DB-9F connector provides an RS-232 compatible connection for the RTTY modem outp ut t o a compu t er. T he out pu t is demodula t ed F S K in t he same code format (Baudot, ASCII, etc.) as the received signal. It is not decoded or changed in any way except for demodulation. The AFSK modulat ed ou tpu t for the tr ansmitter appears on the line output c onnector of the selected channel. The channel is selectable within setup. The PTT outp ut signa l needed to put your tr a nsceiver in tr ans mit mode is pa r t of t he DIN c onnector f or the appropriate channel.

The AFSK output is a modulated AFSK signal in the same code format (Baudot, ASCII, etc.) as the keying signa l from the computer. The DSP599zx 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 a nd ASC II c ode needs to b e insta lled on t he compu ter connect ed t o the DSP-599zx. Timewave does not provide the terminal program. This modem is for RTTY operation only with signa ling ra tes a t 75 B aud or less.

This modem featu re is designed for RTTY oper ation. It is not des igned to be used as a TNC.

Features Version 1.1 18

Page 19

Timewave DSP-599zx Audio Noise Reduction Fi lter

RTTY Remodulator

The DSP-599zx has another special data function for RTTY only. After passing through the optimized RTTY bandpass filter, a precision DSPbased FSK detector in the DSP-599zx demodulates the noisy incoming RTTY t ones and us es the recovered digit al dat a to dr ive a pr ecision DS Pbased AFSK generator. This remodulation process takes place entirely in the DSP-599zx. The precise clean tones from the RT TY AFSK remodulator can feed any analog multimode controller or TU via the DSP-599zx line au dio ou tpu t.

Many analog RTTY demodulators have difficulty with noisy signals of var ying amplitu de, but virt ually a ll of them can a dequat ely demodulate the precise DSP AFSK generator output. The

[Function]

push-button selects either the remodulator with RTTY filters or the RTTY filters only. This remodula tor is opti mized for non-b u rst data at 7 5 Bau d or less .

RTTY FSK Test Signals

Press

[Tone]

while in the non burst Data mode a t 75 bau d or les s activates

a sync nul (diddle) test tone. If the baud rate is 100 baud or higher, pressing

[Tone ]

Pressing

activates a space mar k reference calibration tone.

[Shift+Tone]

while in the

Data

RTTY mode at 75 baud or less insert s a n a udio FS K t est signa l into t he receive cha nnel. T he “ RYRY” t est signal is centered a t 2210 Hz with a frequency shift of +/- 85 Hz. The ba ud rate is determined by the RTTY parameter settings. The level of marker tone is a djus t a b le rela t ive to t he pr oces sed r eceive signa l. If the baud rate is 100 baud or higher, nothing happens when

[Shift+Tone]

is pressed

Features Version 1.1 19

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Timewave DSP-599zx Audio Noise Reduction Fi lter

Test Instrument Mode

The Test I nstr ument func tion helps a nalyze s ignals a nd other equipment. I t 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 ar e bot h p eak a nd t r u e RM S millivolts . F r equency r esp ons e r a nges f r om 2 0 Hz to 10 kHz. In EME work, the audio millivoltmeter mode is useful in ant enna evalu ation when comparing sun nois e and cold sky nois e.

Voice

Mode

TestData

Setup

Bypass

Tone

Time

! !

Maximum input level is 2000 millivolts rms.

Do not attempt to measure any voltage above 2000 millivolts, especially 115 Vac or 220 Vac power line voltage! You will damage the DSP-599zx! ALL WARRANTIES WILL BE VOID!

Audio Signal Generator

This mode produ ces tunable low-dist ortion, p recision fr equency sine wave test signals fr om 20 H z to 10 kHz in 10 Hz steps. A two-tone test signal may be selected for SSB testing. The operator may use the precision test signa ls for ca libra tion and/ or tr ouble shooting of other equipment t he user may own. The display shows the frequency and amplitude of the output signa l f rom the line output.

Spkr/Chan

Rcl/Store

DSP-599zx

AGC

Shift

Random

Function

High Pass

Center Freq

599-081

Features Version 1.1 20

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

599-046

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Timewave DSP-599zx Audio Noise Reduction Fi lter

Two-Tone Generator

Pr oduces a two-t one signa l that ca n be used for S SB linear ity test ing. The DSP-599zx produces a very pure tone set. This provides for very accurate test ing.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

599-047

CTCSS Tone Decoder

This mode decodes CTCSS tones. The CTCSS function shows the tone frequency and amplitude on the LCD display. There are two modes of operation. The fi rst is the aut odet ect mode which displays the frequency and amplitude of any valid CTCSS tone received. The second is the tone squelch mode which detects a select ed CTCS S tone a nd activa tes a s witch output on the DSP-599zx as well as generates a tone on the selected CTCSS frequency. The audio millivoltmeter function displays the peak amplitude of the selected incoming CTCSS tone. This allows relative measurement of peak deviation of CTCSS tones and voice for UHF and VHF FM/PM transmitters.

Mode

Spkr/Chan

Rcl/Store

Voice

Data

DSP-599zx

Test

Setup

Bypass

AGC

Shift

Tone

Random

Function

Timewave

High Pass

Center Freq

Low Pass

Bandwidth

599-054

Features Version 1.1 21

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Timewave DSP-599zx Audio Noise Reduction Fi lter

DSP-599zx Specifications

AUDIO INPUT A & B

Impedance 20 K ohms or 25 ohms, jumper selectable input signal range for full

output

AUDIO OUTPUT A & B

Speaker output power 1.0 watts into 8 ohms at 13.8 VDC, both output channels A & B operating,

Line Output -3 dBV to -24 dBV referenced to input level. Adjustable within setup. Headphone Jack 1/4” two-circuit jack, use stereo headphones to use all functions, mono headphones for most functions Harmonic Distortion less than 1% at rated output

NOISE REDUCTION FILTERS

Random Noise Reduction entire freq. range of selected

Heterodyne Eliminator (multiple automatic notch)

Heterodyne Eliminator (manual notch)

Note: The random noise reduction and bandpass filters can operate simultaneously.

10 mV to 1.0 volt, front panel programmable

1.5 watts into 4 ohms at 13.8 VDC, both output channels A & B operating,

Frequency Range Attenuation Type Delay

Up to 20 dB, varies with noise characteristics.

filter

entire freq. range of selected bandpass filter

The random noise reduction, tone notch and highpass/lowpass filters can operate simultaneously.

Noise reduction aggressiveness front panel adjustable

Up to 50 dB, varies with noise characteristics Adaptive 5 msec max

Up to 50 dB, varies with noise characteristics manual

Adaptive 5 msec max

CW FILTERS

CW filters Bandwidth = 5 Hz to 600 Hz, 10

CW Marker Tone Sine wave at center freq. of selected CW filter.

DATA FILTERS

RTTY PACTOR, G-TOR, HF Packet

Note: RTTY and AMTOR filters have a notch at the center frequency . CLOVER 2000-2500 Hz 55 dB at 75 Hz outside the passband FIR Linear

SSTV 1100-1300 Hz & 1500-2300

WeFAX 1500-2300 Hz 55 dB at 75 Hz outside the passband FIR Linear

FSK Marker Tones

AMTOR,

Hz steps. Center freq. = 200 to 2150 Hz,

5 Hz steps,

Mark/Space bandwidth 60 Hz to 100 Hz, Center Freq.= 2210 Hz plus options of 1700, 1360, 1300, 1530 or 2125 Hz

RY string

1) matches selected RTTY data mode.

Sync-Nul Character (Diddle)

- Alternating sine waves at mark-space freq. of selected data filter (170 or 200 Hz shift). Baud rate

55 dB at 60 Hz outside the passband FIR Linear

phase

40 dB at 60 Hz outside the passband FIR Linear

phase

50 dB at 75 Hz outside the passband Composite

FIR Linear phase

phase

- Baud rate matches selected data filter.

BW less than 20 Hz=64 msec max BW greater 20 Hz=40 msec max

38 msec max

21 msec max

Features Version 1.1 22

Page 23

RTTY MODEM

Shifts 170, 200, 425, 850 Hz Data Rates 45, 50, 57, 75 Baud Input Audio from receiver. Output Open collector FSK and variable level AFSK Transmit Data

Polarity I/O Receive data, Transmit data, PTT (RS-232 compatible)

VOICE FILTERS

Highpass Corner freq. = 100 to 1000 Hz,

Lowpass Corner Freq. = 1000 to 5000 Hz,

AGC

Voice mode 36 dB CW and Data Modes 18 dB

Timewave DSP-599zx Audio Noise Reduction Fi lter

Normal or Reverse

Frequency Range Attenuation Type Delay

10 Hz steps.

60 dB at 180 Hz outside the passband

60 dB. at 180 Hz outside the passband

FIR Linear phase 24 msec max for any

combination of

FIR Linear phase highpass & lowpass

SIGNAL PROCESSING

A-D/D-A Converter 16 bit linear, sigma-delta conversion, dual channel Signal Processor 16 bit, 27 ns Analog Devices ADSP-2181 with 80 KB of memory

TEST INSTRUMENT MODE

Audio Generator

Audio millivoltmeter

CTCSS encoder decoder

CTCSS squelch

Single or two-tone. single Sine wave tunable from 20 Hz to 10 kHz. Two-tone fixed 700 Hz and 1900 Hz. Sine wave distortion less than 1%.

True RMS from 4 mV to 2000 mV., 20 Hz to 10 kHz

Generates and decodes and displays CTCSS “PL” tones from 67.0 Hz to 254.1 Hz.

Open collector output pulls low when selected CTCSS tone is present. (connection on back panel DIN connector)

MEMORY

Six Memories All configuration setups can be stored and recalled (except volume control setting).

DISPLAY

2x16 alphanumeric characters, dot-matrix, yellow-green backlit LCD.

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 2.53 lb. (1.15 Kg.)

POWER

Requirements 12-16 VDC @ 1A Fuse 1.6A 5 mm x 20 mm

Note:

dB points to comply with traditional da ta filter specification methods. All other filter bandwidths are specified to comply with conventional DSP FIR filter parametric descriptions.

Features Version 1.1 23

RTTY, AMTO R, PacTOR, G-TO R and HF Packet data filter bandwidths are specified at -3