Emona 101 Telecommunications Trainer User Manual
Contents
1. lean towards or speak into the microphone The microphone will continuously output an electrical of about 2Vrms that is an effective AC voltage equivalent to 2V DC BASIC SPECIFICATIONS Microphone electret type with frequency response of 300Hz to 3kHz Output typically 2Vrms 24 ETT 101 USER MANUAL Emona Instruments TUNEABLE LPF Filters are important building block in electronics and telecommunications A filter is used to pass some signals and block other signals A low pass filter passes low frequencies and blocks high frequencies The TUNEABLE LPF module allows the user to vary which frequencies are passed by adjusting the front panel f control knob f is known as the cutoff frequency of the lowpass filter TUNEABLE LPF USE The TUNEABLE LPF module accepts analog level signals and outputs analog level signals The cutoff frequency is adjustable by the user The cutoff range is from 300Hz to 16kHz The amplitude of the output signal can be control via front panel GAIN control A digital level squarewave signal is output which has a frequency 100 times higher than the selected cutoff frequency Measuring the frequency of the digital signal and dividing the frequency by 100 will give the user an instantaneous reading of the TUNEABLE LPF cutoff frequency BASIC SPECIFICATIONS Filter Range 600 Hz to 12 kHz Filter Order 8th order Elliptic Stopband Attenuation gt 50dB at 1 4 f and Passband Ripple lt 0 5dB Gain2. 1 E PHASE SHIFTER GND PCM OUTPUTA TA CLK OUTPUT UTILITIES TUNEABLE COMPARATOR REF IN OUT RECTIFIER DIODE amp RC LPF POWER EXPANSION C analet it tal biskit DESIGNED BY EMONA TIMS AUSTRALIA fe Copyright 2006 Emona Instruments Pty Ltd O Emona Instruments Introduction 4 Conventions ETT 101 System Conventions Making lab experiments interesting and informative is important when introducing new technologies and concepts for the first time to students In order to help students use the ETT 101 so they spend their time learning about the experiment rather than learning how to use the lab equipment the front panel of the ETT 101 has been laid out following a series of front panel conventions All ETT 101 modules conform to the following mechanical and electrical conventions A FRONT PANEL SOCKETS Signal interconnections are made via front panel 2mm sockets Sockets on the LEFT HAND SIDE are for signal INPUTS All inputs are high impedance either 10k ohms or 56k ohms depending on the module in order to reduce effects when connections are made and broken Sockets on the RIGHT HAND SIDE are for signal OUTPUTS All analog outputs are low impedance typically 330 ohms Again this is to reduce effects when connections are made and broken Digital outputs are typically 47 ohms ROUND sockets are only
3. ATCHING ERRORS and MAKING EXPERIMENTS Input and output sockets are protected from damage due to mis wiring An important part of the ETT 101 teaching philosophy is that students are free to make mistakes while patching together experiments By observing the result of their mistake when the signals do not look as expected they can experiment and self correct to obtain the desired result Students are also free to experiment with different ideas by testing their own understanding of how the mathematics or theories actually function in real life implementations The ETT 101 is ideally suited to helping students experience abstract concepts and mathematics actually coming to life Emona Instruments Introduction amp Conventions iii O Emona Instruments This page is intentionally blank Introduction 4 Conventions iv ADDER The ADDER module is used to sum two signals in real time 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 SIGNAL CHANNEL OUT USE The ETT 101 provides two independent ADDER modules as pictured above The first ADDER includes adjustable GAINS The second ADDER module has fixed GAINS of unity x1 Care must be taken when adjusting the gains to avoid overloading the following modules Overloading will not cause any damage but it means non linear operation which is to be avoided in analog systems The ADDE
4. Control O to x2 A A A a ETT 101 USER MANUAL Emona Instruments 25 ETT 101 System Specifications STANDARD ACCESSORIES Patch Cords 20 x 2mm 2mm stackable patch cords Scope leads 3 x 2mm to BNC coaxial oscilloscope leads Headphones 1 x lightweight stereo headphones 24ohm 3 5mm male stereo plug Plug Pack multi input voltage with 12V 1A output regulated Tip is positive Documentation 1x User Manual 1 x Experiment Manual POWER SUPPLY Power Source multi voltage plug pack supplied as standard Power Supply 9V to 15V DC 1A maximum Protection reverse polarity and self resetting circuit breaker protection above 16V input Absolute Maximum Supply Input 30V DC ENVIRONMENTAL Operating Temperature Range 10 to 30 degrees C Storage Temperature Range 5 to 40 degrees C Humidity up to 90 RH non condensing PHYSICAL Case Dimensions front panel 280 x 232mm height 32 to 70mm 30 ETT 101 USER MANUAL Emona Instruments anata igital iskit Emona 101 Telecommunications Trainer User Manual Experiments in Modern Analog and Digital Telecommunications Emona Instruments Pty Ltd 86 Parramatta Road web www ett101 com Camperdown NSW 2050 telephone 61 2 9519 3933 AUSTRALIA fax 61 2 9550 1378 The BISKIT logo is a trademark of Emona TIMS PTY LTD
5. Emona 101 Telecommunications Trainer User Manual Hands on Experience in Modern Analog Digital Telecommunications ana igital biskit cd Contents TITO NN ii am E i ETT 101 System CONVENTIONS musaa am omansa ii 1 DD ER ES 1 2 PUE 2 3 CHANNEL MODULE sn 3 4e DIVIDER osa 4 5 DUAL ANALOG SWITCH niit 5 DE OR od 6 7 EXPANSION cialis till 7 8 HEADPHONE AMELIFTER sen O 8 9 LINE CODE ENCODER o nnreimiananinpcia napa 9 10 MASTER SIGNALS ta 11 11 MULTIPLIER nnnsenessensensenssensennsensennsnnssnnsensnnnsensnnnsensnaneen 13 12 IA o 14 13 PCM ENCODER vs ornatus tarn tana s astaan KOJE NE ISATJA Y N KEN SNENT N NEN KERR KEAR HEKI VATEN TIS 15 14 PCM DECODER aii 18 15 PHASE SHIFTER iii 20 16 SEQUENCE GENERADOR este 22 17 SERIAL TO PARALLEL anna 23 18 SPEECH ra 24 19 TUNEABLE LPF nic 25 20 TWIN PULSE GENERATOR see 26 21 00 NO S serene ede 27 22 VARIABLE DC V ua 28 E OO iii aN 29 ETT 101 System SPecimlcolomeummemaasamosan m 30 EC Declaration ot Conformity aaa APP A Introduction The ETT 101 Telecommunications Trainer As its name implies the Emona Telecoms Trainer 101 is used to help students learn about communications and telecommunications principles It lets you bring to life the block diagrams that fill communications textbooks A block diagram is a simplified representation of a more complex circuit An example is shown in Figure 1 below Block diagrams are us
6. R is capable of delivering a signal well in excess of the standard reference level 4V pk pk given a standard level input The ADDER 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 O lt G lt 2 inverting O lt g lt 2 inverting Bandwidth approx 1MHz A A ETT 101 USER MANUAL Emona Instruments 1 BUFFER Another name for the BUFFER is AMPLIFIER The BUFFER is a variable gain amplifier USE The BUFFER may be used to amplify increase small signals or attenuate reduce large signals The BUFFER has a gain or amplitude control on the front panel labeled GAIN 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 distortion which is to be avoided in analog systems If overload occurs turn the gain control counter clockwise BASIC SPECIFICATIONS Bandwidth DC to approx 700kHz Gain O to 10 2 ETT 101 USER MANUAL Emona Instruments SPEECH The SPEECH module allows speech and audio signals to be converted into an electrical signal USE LIVE CHANNEL The SPEECH module includes a sensitive microphone which will easily pick up normal speech and background noise You do not need to
7. ed to explain the principle of operation of electronic systems like a radio transmitter for example without worrying about how the circuit works Each block represents a part of the circuit that performs a separate task and is named according to what it does Examples of common blocks in communications equipment include the adder multiplier oscillator and so on x Figure 1 The Emona Telecoms Trainer 101 illustrated below has a collection of blocks called modules that you can put together to implement dozens of communications and telecommunications block diagrams EMONA Telecoms Trainer 101 le O mo DC IN 9 15V 1A MULTIPLIER TWIN PULSE GENERATOR SWITCH lt gt I a2 CONTROL 1 O CONTROL 2 o IN 2 OUT Ow VARIABLE VCO SEQUENCE PCM DCV GENERATOR ENCODER s MS lt L voe O DIGITAL ll e O Ol font ome E VDC GAIN 10 N TDM O O H O E INPUT 2 FS SPEECH FREQ El Y EI O 0 Hi DIVIDER 0 INPUT 1 a EXOR al is a eH O 0 E E KLEE E IE B A B IN OUT DUAL ANALOG NOISE GENERATOR OdB 0 6dB MASTER SIGNALS RE 100kHz SINE O 100kHz O cos 100kHz DIGITAL BkHz DIGITAL a MN DIGITAL 2kHz 0 SINE CHANNEL MODULE 030 x ANNEL BPF 030 BASEBAND LPF X DC o 0 YDC KXY SERIAL TO PARALLEL s P E SERIAL X
8. for ANALOG signals ANALOG signals are typically held near the ETT 101 standard reference level of 4V pk pk SQUARE sockets W are only for DIGITAL signals DIGITAL level signals are TTL level O to 5 V ROUND sockets labeled GND are common or system GROUND Note that input and output impedances are intentionally mismatched so that signal connections may be made or broken without changing signal amplitudes at module outputs Input and output sockets are protected from damage due mis wiring B LABELLING 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 introduction to TIMS can use the modules without needlessly referring back to this USER MANUAL Emona Instruments Introduction amp Conventions ii Front panel input and output conventions are illustrated below INPUT OUTPUT sockets on sockets on the LEFT the RIGHT DUAL ri r ANALOG output sockets IN 1 DIGITAL input sockets CONTROL 1 CONTROL 2 ANALOG input sockets SE EXAMPLE ETT 101 MODULE It should be noted that variable controls do NOT 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 C P
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