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1. Table UTIL 1 CLIPPER gain settings DIP switches SW1 and SW2 will be found in the middle of the UTILITIES module s circuit board NOTE Both halves bits of each switch must be in the SAME position at all times BASIC SPECIFICATIONS COMPARATOR Operating Range gt 500kHz TTL Output Risetime 100nsec typ CLIPPER Operating Range gt 500kHz Output Level 1 8Vpk typ Adjustable Gains 3 steps x0 8 x8 and x40 approx RECTIFIER Bandwidth DC to 500kHz approx DIODE amp LPF LPF 3dB 2 8kHz approx RC LPF LPF 3dB 2 8kHz approx TIMS 801 Junior User Manual 21 VARIABLE DC TIMS 801 JUNIOR FIXED SYSTEM MODULE The VARIABLE DC module is a stable bipolar DC source and a fixed 5V output VARIABLE DC DC VOLTAGE CONTROL O bc ourPur DG GROUND REFERENCE FRONT PANEL USE DCV GND BLOCK DIAGRAM The DC voltage output varies from about 2 5V when the control is fully counter clockwise through zero to 2 5V when control is turned fully clockwise If greater resolution or wider range is required then one of the BUFFER AMPLIFIERS can be used in conjunction with the VARI ABLE DC module The fixed output provides a TTL level logical HI 5V BASIC SPECIFICATIONS Voltage Range 2 5V DC Short term Stability 2mV hr Resolution approx 20mV Output Current 5mA Fixed Output 5V DC Output Current approx 15mA TIMS 801 Junior User Manual 22 VCO OPTIONAL BASIC
2. TIMS 801 JUNIOR USER MANUAL Telecommunications Instructional Modelling System TIMS 801 JUNIOR USER MANUAL Issue Number 1 1 October 2001 Published by EMONA INSTRUMENTS PTY LTD a c n 001 728 276 86 Parramatta Road Camperdown NSW 2050 Sydney AUSTRALIA COPYRIGHT c 2001 by EMONA INSTRUMENTS PTY LTD TIMS is a registered trademark of AMBERLEY HOLDINGS PTY LTD Printed in Australia CONTENTS Part TIMS INTRODUCTION TIMS OVERVIEW SYSTEM CONVENTIONS Front Panel Sockets Plug in Modules Labeling Basic Modules List Basic Specifications Part Il BASIC MODULES USER INSTRUCTIONS Adder Audio Oscillator Buffer Amplifiers Dual Analog Switch Frequency and Event Counter Master Signals Multiplier Phase Shifter Quadrature Phase Splitter Sequence Generator Tuneable LPF Twin Pulse Generator Utilities Module Variable DC Voltage Controlled Oscillator 60kHz Lowpass Filter OAN OO SA 14 15 17 18 20 22 23 25 TIMS INTRODUCTION TIMS OVERVIEW TIMS is a telecommunications modelling system It models mathematical equations repre senting electrical signals or block diagrams representing telecommunications systems TIMS is primarily a hands on rather than demonstration style teaching system which combines both the theoretical and practical aspects of implementing systems We are confident that TIMS will provide the student with a clearer understanding of the concepts behind telecommunications theo
3. ANALOG INPUT TO NETWORK 1 ANALOG OUTPUT cos FROM NETWORK 1 ANALOG INPUT TO NETWORK 2 ANALOG OUTPUT FROM NETWORK 2 FRONT PANEL BLOCK DIAGRAM USE The QUADRATURE PHASE SPLITTER consists of two wideband phase shifting networks The networks phase responses vary with frequency in a complimentary manner giving a 90 degree phase difference between the outputs over a wide frequency range In communications the most important application is the generation and demodulation of Single Sideband by the phasing method BASIC SPECIFICATIONS Frequency Range 200Hz to 10kHz typically Phase Response 90 degrees between outputs given the same input signal to both networks PARAMETERS TO NOTE Phase error from 90 degrees This may be measured directly difficult or calculated from side band suppression measurements TIMS 801 Junior User Manual 14 SEQUENCE GENERATOR OPTIONAL BASIC PLUG IN MODULE PSEUDORANDOM SEQUENCE GENERATOR Using a common external clock signal the sequence generator outputs two independent pseudorandom sequences X and Y A SYNC output is provided which is coincident with the start of the sequences The sequences may be stopped and restarted at any time via front panel controls Sequences X and Y are available as either standard TTL or analog level output SEGUENCE GENERATOR RESET ANALOG OUTPUT PUSH BUTTON x TTL LEVEL RESET BEGINNING OF SEQUENCE SYNC RESET CLOCK X S
4. ANALOG REFERENCE CLIPPER N Ng TTL INPUT BIPOLAR OUTPUT ux REF CLIPPER ANALOG SIGNAL COMPARATOR ia INPUT TTL OUTPUT COMPARATOR IN gt OUT ANALOG INPUT ANALOG OUTPUT gt RECTIFIE PRECISION ANALOG INPUT ANALOG OUTPUT N gt Bus PSY RC ANALOG INPUT C O ANALOG OUTPUT X IN OUT RC FRONT PANEL BLOCK DIAGRAM USE COMPARATOR The COMPARATOR will square any analog signal and provide a standard TTL level output The switching threshold level is determined by the voltage level applied to the REF input NOTE For correct COMPARATOR operation the REF input must never be left unconnected The REF input may be connected to GROUND VARIABLE DC or any other signal source CLIPPER The CLIPPER will amplify any analog TIMS level signal and then clip the amplitude of the ampli fied signal to a fixed level of approximately 1 8V The clipping action is performed by standard small signal diodes NOTE The REF input is NOT used by the CLIPPER TIMS 801 Junior User Manual 20 Adjusting the gain of the CLIPPER determines whether the clipping action is SOFT ME DIUM or HARD The following table UTIL 1 relates DIP switch settings to CLIPPER gains and clipping action CLIPPING GAIN DIP SWITCH SETTINGS ACTION approx SW1 both a amp b SW2 both a amp b SOFT x0 8 ON ON OFF OFF MEDIUM x8 OFF OFF OFF OFF HARD x40 OFF OFF ON ON not applicable ON ON ON ON
5. counter mode Gate time of 1s with reading in kHz COUNTS Event counter mode displays number of pulses counted since last RESET 5 RESET Push Button resets the count of the Event Counter to zero 6 5 digit 7 segment display of frequency or pulse counts maximum display 99999 ADVANCED FREQUENCY COUNTER INFORMATION In frequency counter mode this module can be used along with an oscilloscope to accurately measure the frequency of signals between 100kHz and 900kHz If a signal of more than 100kHz is input then the OVERFLOW LED will be lit However the 5 digit display will always ac curately display the 5 least significant digits of the measurement So if an oscilloscope is used to determine the frequency of the unknown signal to the nearest 100kHz this module s 5 digit display will measure the lower 5 significant digits of the frequency measurement TIMS 801 Junior User Manual 8 MASTER SIGNALS TIMS 801 JUNIOR FIXED SYSTEM MODULE Five synchronized analog and digital signals are available ranging from 2kHz to 100kHz The function and frequency of each signal is indicated on the front panel MASTER SIGNALS sin ct QUADRATURE ANALOG CARRIER SIGNAL cos ot cones O INPHASE ANALOG CARRIER SIGNAL TTL TTL LEVEL CARRIER SIGNAL TTL 8 3kHz 8 3kHz savele O TTL LEVEL TTL d 100kHz sin ut ullis C ANALOG SIGNAL sin ut FRONT PANEL BLOCK DIAGRAM USE Signals are labeled as follows CARRIER signals ar
6. 60kHz Passband Gain variable 0 to 5 approx Stopband Attenuation 50dB typ Passband Ripple 0 1dB typ PARAMETERS TO NOTE corner point response shape passband ripple phase shift out of band attenuation TIMS 801 Junior User Manual 25
7. EQUENCE O TT output iis Y SEQUENCE SYNC ANALOG CLOCK TTL CLOCK TTL OUTPUT Y FRONT PANEL BLOCK DIAGRAM USE An external clock signal must be provided to operate the SEQUENCE GENERATOR This may be sinusoidal or TTL separate input sockets are used The sequences may be stopped at any time by either depressing the RESET button or apply ing a TTL HI signal to the RESET input To restart the sequences from the beginning release the RESET button or apply a TTL LO to the RESET input The length of the sequences may be selected by a PCB mounted dip switch Four independent sequence pairs are available from lengths of 25 to 211 The sequences are selected as follows DIP SWITCH CODE n SEQUENCE LENGTH 2 msb 0 0 5 32 0 1 8 256 1 0 8 256 1 1 11 2048 TIMS 801 Junior User Manual 15 BASIC SPECIFICATIONS Input Clock Range TTL 1Hz to 1MHz Analog lt 500Hz to 10kHz Number of Sequences 4 pairs Sequence Lengths 2 28 28 211 Sync indicates start of sequence PARAMETERS TO NOTE sequence distribution noise generation using pseudorandom sequences TIMS 801 Junior User Manual 16 TUNEABLE LPF OPTIONAL BASIC PLUG IN MODULE The cutoff frequency of this LOWPASS FILTER can be varied using the TUNE control Two frequency ranges WIDE 2 0kHz to 12kHz and NORMAL 900Hz to 5kHz can be se lected by a front panel switch The GAIN control allows input signals to be attenuated if r
8. PLUG IN MODULE The Voltage Controlled Oscillator module functions in two modes either as a VOLTAGE CON TROLLED OSCILLATOR with analog input voltage or as an FSK GENERATOR with digital in put Both modes have two frequency ranges of operation which are selected by a range switch The VCO frequency and input sensitivity can be controlled from the front panel Vin VCO OUT FSK pam dd TTL LEVEL VCO MODE OUTPUT SET SENSITIVITY TTL DATA VCO FSK OF INPUT CONTROL VOLTAGE EAN Vin OVERLOAD FSK MODE INDICATION LED SET CENTER BLOCK DIAGRAM FREQUENCY FREQUENCY RANGE SELEC CONTROL VOLTAGE ANALOG OUTPUT INPUT y sin wt FSK1 FSK2 amp FSK VCO FRONT PANEL 9 O OO PCB VIEW VCO USE STANDARD VCO OPERATION The VCO output frequency is controlled by an analog input voltage The input voltage Vin is scaled amplified by the front panel GAIN control A DC voltage can be added to Vin inter nally thus setting the start or CENTER FREQUENCY fo The CENTER FREQUENCY is de fined as the VCO output frequency when no voltage is applied to the Vin connector The Vin in put is internally tied to ground if no signal is applied The Vin OVERLOAD LED is lit when the sum of these voltages scaled Vin plus CENTER FREQUENCY DC offset exceed the oscillator s internal operating limits Decrease the GAIN turn counter clockwise and or shift the CENTER FREQUENCY fo to extinguish the LED The freque
9. R can also be used as a normal amplifier by using only one input and turning the gain of the other input to minimum It is not necessary to ground the unused input Note that gains G and g are negative All inputs and outputs are DC coupled BASIC SPECIFICATIONS Gain Range 0 lt G lt 2 0 lt g lt 2 Bandwidth approx 1MHz Output DC Offset lt 10mV open circuit inputs PARAMETERS TO NOTE maximum output level linearity polarity inverting phase shift TIMS 801 Junior User Manual 4 AUDIO OSCILLATOR OPTIONAL BASIC PLUG IN MODULE The AUDIO OSCILLATOR is a low distortion tuneable frequency sinewave source with a fre quency range from 500Hz to 10kHz Three outputs are provided Two outputs are sinusoidal with their signals in quadrature The third output is a digital TTL level signal AUDIO OSCILLATOR INPHASE SS ANALOG cos at SYNC cos wt OUTPUT sin ct TTL LEVEL OUTPUT SQUARER FREQUENCY ADJUST QUADRATURE sintwt ANALOG OUTPUT FRONT PANEL BLOCK DIAGRAM USE The frequency of each of the three outputs is the same and is varied by the front panel A f con trol Both the in phase and quadrature analog output signals have fixed amplitude Their shape is sinusoidal having a distortion of less than 0 1 The AUDIO OSCILLATOR may be synchronized to an external periodic signal by connecting such a signal to the front panel SYNC input A signal of about 1 volt peak is adequate for this pu
10. T COUPLING SWITCH AC ANALOG INPUT X ANALOG INPUT CO O ANALOG OUTPUT FRONT PANEL BLOCK DIAGRAM USE The input coupling switch may be used to remove input DC components by switching to AC coupling It should be noted that any DC component in the output will not be removed The k factor a scaling parameter associated with four quadrant multipliers is approximately one half It is defined with respect to the OUTPUT from the module and may be measured ex perimentally BASIC SPECIFICATIONS Bandwidth approx 1MHz Characteristic k X t Y t k approx 1 2 PARAMETERS TO NOTE linearity k factor carrier leak phase response DC off set performance as a squarer fre quency response conversion gain as a de modulator TIMS 801 Junior User Manual 11 PHASE SHIFTER OPTIONAL BASIC PLUG IN MODULE The PHASE SHIFTER introduces a phase shift between its input and output This phase shift is adjustable by the user The frequency range of operation can be selected by PCB mounted Switch IN OUT BLOCK DIAGRAM PHASE SHIFTER COARSE PHASE ADJUST FINE PHASE ADJUST 1809 PHASE CHANGE HI ANALOGINPUT O O ANALOG OUTPUT eser IN OUT FRONT PANEL PCB VIEW USE This variable PHASE SHIFTER is capable of varying the magnitude of the phase shift through 360 degrees in two steps The 180 degree switch selects the step or region of interest the COARSE and FINE controls are used t
11. and SINGLE Only TWIN mode is limited to low frequency CLOCK inputs In TWIN mode Q1 outputs the leading pulse and Q2 outputs the delayed pulse The time be tween pulses Q4 and Q2 can be varied as can the pulses widths In SINGLE mode only Q4 outputs a positive going pulse while Q2 outputs the inverse of Q4 The pulse width can be varied TWIN PULSE GENERATOR GLOCK JL PULSE Q TLl O ERROR LED INDICATES IF 2tw tD gt tcLk BLOCK DIAGRAM PULSE WIDTH CONTROL TTL LEVEL terk DELAY TIME LEADING PULSE 1 E woe CONTROL OUTPUT t AC COUPLED DELAYED PULSE Q CLK OUTPUT t DIGITAL CLOCK TTL LEVEL OUT es tw E t tp DELAY ty WIDTH TIMING DIAGRAM FRONT PANEL USE A digital TTL level signal is applied to the CLK input The GENERATOR then outputs one or two pulses depending upon the operating mode selected Use the PCB mounted MODE switch to select either SINGLE or TWIN operating mode TWIN MODE TWIN mode is used when two sequential pulses are needed Two equal width positive pulses occur as a result of each CLK signal positive edge Pulse Q4 always occurs before pulse Q2 The width of both pulses is controlled by the front panel WIDTH control The DELAY control var ies the spacing between the two pulses Note that TWIN mode will only accept CLOCK input signals of up to 50kHz depending upon front panel settings If WIDTH and DELAY have been incorrectly set causing anomalous opera
12. e quired TUNEABLE LPF CLK 880 f 3ag NORMAL CLK 360 f 3ag WIDE CUT OFF FREQUENCY ADJUST GAIN ADJUST ox FREQUENCY IN Fo OUT RANGE SELECT WIDE NU TUNEABLE ANALOG INPUT ANALOG OUTPUT IN OUT FRONT PANEL BLOCK DIAGRAM USE This lowpass filter has a 7th order elliptic filter characteristic The stopband attenuation is typi cally 50dB and passband ripple is approximately 0 5dB The GAIN control should be used to attenuate large input signals and thus avoid saturation of the filter output circuits Two frequency ranges are provided NORMAL range provides more pre cise control over the lower audio band used for telecommunications message channels The WIDE range expands the filter s range to above 10kHz The CLK output provides an indication of the filter s cutoff frequency Note that above 9kHz the dividing factor increases from 340 to 430 at 12kHz BASIC SPECIFICATIONS Filter Ranges 900Hz NORMAL 5 kHz and 2 0kHz WIDE 12 kHz continuously variable over each range Stopband Attenuation gt 50dB Passband Ripple 0 5dB PARAMETERS TO NOTE corner point phase shift gain range passband ripple out of band attenuation TIMS 801 Junior User Manual 17 TWIN PULSE GENERATOR OPTIONAL BASIC PLUG IN MODULE TWIN PULSE GENERATOR VERSION 2 0 A positive going edge applied at the CLOCK input causes a positive pulse to occur at the out put terminals There are two operating modes TWIN
13. e 100kHz which for modelling purposes is sufficiently far from the audio channel bandwidth of 3kHz The SAMPLE CLOCK of 8 3kHz which may be used to sample bandwidth limited 3kHz audio message signals MESSAGE provides an audio frequency signal which is synchronized to a sub multiple of the carrier to enable text book like displays of simple modulation schemes to be achieved The five signals are derived from a master crystal oscillator resulting in low frequency drift Their frequencies are fixed internally The output levels are also fixed To vary the amplitude the signals may be applied to the neighboring buffers The analog signals are sinusoidal in shape having a distortion of less than 0 1 Digital signals are all standard TTL level with rise times of better than 80nsec TIMS 801 Junior User Manual 9 BASIC SPECIFICATIONS Output Frequencies 100kHz carrier 8 333kHz sample clock 2 083kHz audio carrier sub multiple Output Levels 4V pk pk analog TTL level digital Distortion 0 195 analog outputs only PARAMETERS TO NOTE short term frequency stability relative phase of quadrature outputs harmonic content TIMS 801 Junior User Manual 10 MULTIPLIER OPTIONAL BASIC PLUG IN MODULE Two analog input signals X t and Y t may be multiplied together The resulting product is scaled by a factor of approximately 1 2 so that with standard level inputs later stages are not overloaded MULTIPLIER INPU
14. ncy range switch selects between the HI or carrier band and the LO or audio band Both sinewave and digital outputs are available TIMS 801 Junior User Manual 23 SPECIAL VCO OPERATION F NE FREQUENCY CONTROL In some applications fine control may be required over the output frequency of the VCO This may be easily achieved by following these four steps MODULES REQUIRED VCO and VARIABLE DC STEP 1 Set the VARIABLE DC module s output close to zero marker knob at 12 o clock position STEP 2 1 Turn the GAIN control of the VCO to zero fully counter clockwise STEP 2 2 Now turn the GAIN control up clockwise just a little only a few degrees STEP 3 Set the VCO module s output frequency as close as possible to the frequency of interest Use the frequency adjust knob fo Use the FREQUENCY COUNTER to measure the VCO s output frequency STEP 4 Finally patch the VARIABLE DC module s output to the VCO module s frequency control input Vin with a standard patching lead FINE FREQUENCY CONTROL of the VCO module is now achieved by turning the VARIABLE DC module s voltage control knob FSK USE A PCB mounted slide switch selects between FSK and VCO modes of operation The two out put frequencies FSK4 and FSK2 MARK and SPACE are set by varying the PCB mounted finger adjustable trimmers As in VCO mode the frequency range switch selects between the HI or carrier band and the LO or audio band The digital data input acce
15. o then obtain the required phase shift b If the input is COS ut then the output is COS ut where o lies between 0 and 180 degrees Although the PHASE SHIFTER will operate from a few hertz up to 1MHz it has been optimized to operate in the neighborhood of two frequencies around 100kHz in the HI range and around 2kHz in the LO range A PCB mounted switch is used to select the frequency range The open circuit gain through the PHASE SHIFTER is essentially unity for all phases but note that the amount of phase shift is a function of frequency This is NOT a wideband phase changer thus all the frequency components of a complex signal s spectra are not shifted by the same phase TIMS 801 Junior User Manual 12 BASIC SPECIFICATIONS Bandwidth 1MHz Frequency Range HI approx 100kHz LO approx 2kHz For 0 to 360 degree range of phase shift The phase shift range increases i e resolu tion decreases as the input frequency increases Coarse approx 180 degrees shift Fine approx 20 degrees shift PARAMETERS TO NOTE Variation of phase change with frequency change TIMS 801 Junior User Manual 13 QUADRATURE PHASE SPLITTER OPTIONAL BASIC PLUG IN MODULE When the same analog signal is applied to both inputs the two output signals will differ in phase by 90 degrees The phase splitter networks are wideband typically covering the range from 200Hz to 10kHz QUADRATURE PHASE SPLITTER b b 90 error
16. pts only TTL level sig nals Both sinewave and digital outputs are available GAIN and CENTER FREQ fo controls and the Vin connector are not used in the FSK mode BASIC SPECIFICATIONS VCO MODE Frequency Ranges 1 5kHz lt LO lt 17kHz sinewave and TTL lt 300Hz with external input voltage Vin 70kHz lt HI lt 130kHz sinewave and TTL Input Voltage 3V Vin 3V Overload limit indication LED Vyco gt 3V Vvco is the internal voltage finally applied to the VCO circuitry GAIN G Vin 1 lt G lt 2 Center Frequency Voltage Range 3V lt Vic lt 3V Vic is a DC voltage added INTERNALLY to G Vin FSK MODE Frequency Ranges 1 5kHz lt FSK1 Lo lt 9kHz 500Hz lt FSK2 Lo lt 4kHz 80kHz lt FSK1 ui lt 200kHz 20kHz FSK2 ui 120kHz Data Input TTL level message TIMS 801 Junior User Manual 24 60kHz LOWPASS FILTER OPTIONAL BASIC PLUG IN MODULE An elliptic lowpass filter is provided with a cutoff point of approximately 60kHz The input signal amplitude can be adjusted with the gain control GOkHz LPF INPUT GAIN CONTROL Ow ANALOG INPUT O ANALOG OUTPUT IN OUT FRONT PANEL BLOCK DIAGRAM USE The 60kHz LPF allows carrier signals to be removed from a given signal spectrum For example as the lowpass filter for envelope detector applications The GAIN control allows input signals to be attenuated to avoid overloading the filter BASIC SPECIFICATIONS Cutoff Frequency approx
17. rpose For synchronization to be achieved the AUDIO OSCILLATOR must be manually tuned to within a few percent of the frequency to which synchronization is desired BASIC SPECIFICATIONS Frequency Range 300Hz to 10kHz Analog Output Level 4V pk pk Distortion lt 0 1 analog outputs only Digital Output TTL level PARAMETERS TO NOTE frequency range relative phase of outputs amplitude stability with frequency range harmonic content short term stability synchronizing characteristic TIMS 801 Junior User Manual 5 BUFFER AMPLIFIERS TIMS 801 JUNIOR FIXED SYSTEM MODULE Two independent variable gain amplifiers are provided BUFFER AMPLIFIERS GAIN CONTROL ANALOG INPUT OF A k A FIRST AMPLIFIER GAIN CONTROL B kB ANALOG INPUT OF SECOND AMPLIFIER FRONT PANEL BLOCK DIAGRAM USE These buffers may be used to amplify small signals or attenuate large signals Each amplifier has its own gain control on the front panel Care should be taken to ensure that later modules are not overloaded due to excessive gain Overload will not cause any damage but it means non linear operation which is to be avoided in analog systems If overload occurs turn the gain control counter clockwise BASIC SPECIFICATIONS Bandwidth DC to approx 1MHz Gain 0 to 10 TIMS 801 Junior User Manual 6 DUAL ANALOG SWITCH OPTIONAL BASIC PLUG IN MODULE Two identical analog switches are controlled by digital TTL level signals The outpu
18. ry Physically the TIMS 801 JUNIOR is a compact single rack system The rack accepts up to 8 Eurocard sized compatible telecommunications building blocks or modules It also contains 4 fixed modules as well as the system power supply The modules are very simple electronic circuits which function as basic communications build ing blocks Each module fixed or plug in has a specific function functions fall into four general categories Signal Generation oscillators etc Signal Processing multipliers filters etc Signal Measurement frequency counter Digital Signal Processing TMS320C50 based Modules are patched together via the front panel sockets using interconnecting leads to model the system under investigation TIMS 801 Junior User Manual 1 SYSTEM CONVENTIONS All TIMS modules conform to the following mechanical and electrical conventions A FRONT PANEL SOCKETS Signal interconnections are made via front panel 4mm sockets Sockets on the LEFT HAND SIDE are for signal INPUTS All inputs are high impedance typically 56k ohms Sockets on the RIGHT HAND SIDE are for signal OUTPUTS All outputs are low impedance typically 330 ohms YELLOW sockets are only for ANALOG signals ANALOG signals are held near the TIMS standard reference level of 4V pk pk RED sockets are only for DIGITAL signals DIGITAL signals are TTL level 0 to 5 V GREEN sockets are all common or system GROUND Note that input and outp
19. ster Signals Variable DC OPTIONAL BASIC PLUG IN MODULES Adder Audio Oscillator Dual Analog Switch Multiplier Phase Shifter Quadrature Phase Splitter Sequence Generator Tuneable LPF Twin Pulse Generator Utilities Module Voltage Controlled Oscillator 60kHz Lowpass Filter BASIC SPECIFICATIONS POWER SUPPLY Input 110 127 220 or 240V AC 47Hz to 63Hz Output 15V 1 25A DC 15V 1 25A DC Protection short circuit overload thermal Regulation 0 2 PHYSICAL Case Dimensions 490 W x 330 D x 310 H mm System Weight 10kg Plug in Card Dimensions 160 x 100 mm Plug in Card Bus Connectors 64 way 2 row Eurocard MODULES Specifications for each module are listed in the following pages TIMS 801 Junior User Manual 3 ADDER OPTIONAL BASIC PLUG IN MODULE Two analog input signals A t and B t may be added together in adjustable proportions G and g The resulting sum is presented at the output G GAIN CONTROL FOR INPUT A A b GA gB ANALOG INPUT A g GAIN CONTROL FOR INPUT B ANALOG INPUT ANALOG OUTPUT B GA gB FRONT PANEL BLOCK DIAGRAM USE Care must be taken when adjusting the gains to avoid overloading the following modules Over loading will not cause any damage but it means non linear operation which is to be avoided in analog systems The ADDER is capable of delivering a signal well in excess of the standard ref erence level 4V pk pk given a standard level input The ADDE
20. tion the ERROR LED will be lit To eliminate the error reduce DELAY and then WIDTH by turning counter clockwise TIMS 801 Junior User Manual 18 SINGLE MODE SINGLE mode is used to obtain a train of equal width pulses from any TTL level signal Equal width positive pulses occur at Q4 output as a result of each CLK signal positive edge The width of the pulses is controlled by the front panel WIDTH control Q2 simultaneously out puts the compliment of Q4 The DELAY control is not used in this mode Note that Q4 includes both a TTL level and an AC coupled output pulse BASIC SPECIFICATIONS TWIN MODE Clock Frequency Range 50kHz Pulse WIDTH 3ys tw 25us Pulse DELAY Q2 Q1 10us lt ta lt 120us Error Indication 2tw ta gt tcLk SINGLE MODE Clock Frequency Range lt 200kHz Pulse WIDTH 3us lt tw lt 25us TIMS 801 Junior User Manual 19 UTILITIES MODULE OPTIONAL BASIC PLUG IN MODULE The Utilities Module houses 4 independent functional blocks i A signal COMPARATOR with TTL output and CLIPPER with bipolar output for squaring ana log waveforms The COMPARATORS s threshold level may be set as required by applying a DC voltage to the REF input The CLIPPER s gain may be set by adjusting DIP switches SW1 and SW2 ii Precision halfvave RECTIFIER iii Simple diode and single pole audio range RC Lowpass Filter SW1 SW2 iv Single pole audio range RC Lowpass Filter BIPOLAR UTILITIES OUT
21. ts of the two Switches are added internally and presented at the output of the module DUAL ANALOG SWITCH ANALOG INPUT 1 IN 4 TTL CONTROL FOR INPUT 1 CONTROL 1 TTL CONTROL FOR INPUT 2 CONTROL 2 ANALOG INPUT 2 OUTPUT FRONT PANEL USE IN 1 CONTROL 1 CONTROL 2 IN2 41 LA BLOCK DIAGRAM Each switch may be closed independently by a TTL HIGH at the respective control input The switch outputs are combined internally and are presented at the common output socket Open circuit voltage gain between each input and the module output is unity when the switch is closed BASIC SPECIFICATIONS Analog Input Bandwidth gt 300kHz Maximum CONTROL clock gt 100kHz CONTROL Input Levels TTL only Maximum Analog Input Level 8V PARAMETERS TO NOTE switch On Off ratio linearity switching speed analog bandwidth channel cross talk DC off set TIMS 801 Junior User Manual 7 OUTPUT FREQUENCY COUNTER TIMS 801 JUNIOR FIXED SYSTEM MODULE The TIMS 801 JUNIOR s counter is a 5 digit 99 999kHz frequency and event counter FREQUENCY COUNTER S 2 6 2 a 2 5 3 4 BASIC SPECIFICATIONS 1 OVERflow indication LED 2 ANALOG TTL input Bandwidth 40Hz to greater than 100 kHz Sensitivity 250mV typically 100kHz Maximum input 12V 3 TTL ENABLE may be used to gate the TTL input signal Specifications are same as for the main input 4 Mode selection switch kHz Frequency
22. ut impedances are intentionally mismatched so that signal connections may be made or broken without changing signal amplitudes at module outputs B PLUG IN MODULES Any plug in module may be placed in any of the 12 positions of the upper rack All modules use the back plane bus to obtain power supply only the DSP modules not part of the BASIC SYS TEM use the bus to transfer signals The modules are designed so that they may be plugged in or removed at any time without turning off the system power The modules are not locked into position and may need to be held while interconnecting leads are removed C LABELING All modules are identified as to the function they perform Inputs outputs controls and switches are labeled so that a student who has had only a brief in troduction to TIMS can use the modules without needlessly referring back to this USER MANUAL It should be noted that no variable controls have calibration marks This is intentional as the philosophy behind TIMS is that students setup and adjust systems by observing and measuring signals This assists the student in gaining a much greater understanding feel and insight into the operation of a communications implementation TIMS 801 Junior User Manual 2 D BASIC MODULE LIST Below are listed all the fixed TIMS 801 JUNIOR SYSTEM MODULES and the optional plug in BASIC modules TIMS 801 JUNIOR SYSTEM FIXED MODULES Buffer Amplifiers Frequency and Event Counter Ma

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