Respuestas Del Manual

8/12/2019 Respuestas Del Manual

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IPES

COPYRIGHT BY ELETTRONICA VENETA & INEL SPA

ANALOG COMMUNICATIONS I

module MCM20/EV

Volume 2/2

SERVICE MANUAL

T E A C H E R h a n d b o o k

31045 MOTTA DI LIVENZA (Treviso) ITALY

Via Postumia, 16


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MC2012E0.DOC


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SAFETY RULES

SAFETY RULES

Keep this document for any further reference.

As regards the characteristics of this module, refer to the Volume 1 of the same module

After unpacking the equipment, save all the accessories so that theycannot be lost. Check that the module is integral, with no visibledamage.

Before powering the card for entering faults with the voltage, check thatthe power cables are correctly connected to the power supply.

Use this equipment exclusively for the aims which it has been expresslydesigned for, that is, for educational purpose; furthermore it must beused under the direct responsibility of a skilled staff. Any other use isnot proper, therefore it is dangerous. The manufacturer is notresponsible for any damage due to improper, erroneous or irrationaluses.


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1. DISIMBALLAGGIO ed ISPEZIONE

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1. UNPACKING and INSPECTION

1.1 UnpackingThe module and its accessories are packed in a carton which can also beused to store all the equipment after its use.

1.2 Inspection and identification of materials

This carton contains:

1 module MCM20

accessories


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2. INSTALLATION

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2. INSTALLATION

2.1 Mechanical connections

1. Fix the module to the lower part of the horizontal Box or of theVertical Frame (fig. 2.1)

2. fix one of the Units SIS1, SIS2 or SIS3 to the upper part of thehorizontal Box or of the Vertical Frame (fig. 2.1) or, in option,connect the Unit SIS1C directly to the 37-pin connector of themodule

2.2 Electrical connections

3. Connect one of the Units SIS1, SIS2 or SIS3 to the module(through the proper cable), or check whether the Unit SIS1C isconnected to the 37-pin connector of the module

4. connect the jacks of +12 V, -12 V and Ground of the Module to thecorresponding outputs of a power supply (fig. 2.2a)or if our power supply mod. PSU/EV is used, connect the Module tothis power supply with the proper cable of the equipment (fig. 2.2b)

5. Connect the transformer to the three-phase line.

Fig.2.1 Mechanical connections

Fig.2.2 Electrical connections


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3. START UP

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3. START UP

The procedure described hereafter enables a quick checking of theoperation of module MCM-20/EV.

Necessary Material Module MCM-20/EV Power supply PSU/EV or power supply +12V Fault unit SIS1/EV Digital frequencymeter Function generator (with sweep option) Oscilloscope

(1) Module set-up: (Tuned Circuits & Coupling)

Connect jumpers: J16, J17, J18, J20 Turn RV3 and RV4 to the max COUPLING = MIN Connect TP4 to TP36 Connect I to TP38 DEPTH to the min

Set the VCO to get a sine signal across TP36: frequency 700 kHz.Amplitude=2Vpp Oscilloscope in XY:

channel X = 2V/div. On TP1 (sweep)channel Y= 0.1V/div on TP39 (ground on TP40)

(1) Checking the operation: (Tuned Circuits & Coupling)

Power the module Turn COUPLING to the MIN and check the curve as fig. 902.6a)

pag. 17, with amplitude ranging between 300 and 400 mVpp Turn COUPLING to the MAX and check a figure as 902.6b) pag.

17, with amplitude ranging between 400 and 500 mVpp

(2) Module set-up: (VCO) Connect TP4-TP43 Connect TP3 - I J22 = connected Set the VCO to get lMHz/2Vpp on TP43

Connect a sine signal of 1 kHz/1Vpp across TP41 Oscilloscope to TP48


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3. START UP

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(2) Checking the operation: (VCO)

Turn the FREQUENCY trimmer from the min to the max . andcheck the frequency ranging between 400 and 1500 kHz

Turn SW1=500kHz. Turn FREQUENCY from the min to the max.and check the frequency ranging between 400 and 500 kHz.

(3) Module set-up: (AM transmitter)

Connect TP4-TP43 Connect TP3 - I J22 = connected Set the VCO to get 1MHz/2Vpp on TP43 Connect a sine signal of 1 kHz/1Vpp across TP41

Oscilloscope on TP48. Set the VCO to get 1MHz/2Vpp on TP43 Connect a sine signal of 1 kHz/lVpp across TP41 Oscilloscope to TP48

(2) Checking the operation: (AM Transmitter)

Check the AM modulation 100%. Amplitude 20Vpp


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4. ELECTRIC DIAGRAMS

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4. ELECTRIC DIAGRAMS

Refer to the diagrams attached to this handbook.


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5. MAINTENANCE

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5. MAINTENANCE

No particular maintenance operations are required.


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6. ANSWERS to the QUESTIONS

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LESSON 900 A B

Q1 4 1 approximately 0.8 Vpp

Q2 3 4 approximately 2 dB

Q3 2 4 approximately 0.5 Vpp

Q4 4 1 approximately 6 dB

Q5 3 2 A dB = 20 log 10 (Vout /Vin)

Q6 4 1 input impedance / attenuation / output impedance

LESSON 901 A B

Q1 4 3 resonance frequency

Q2 3 2 it depends on the position of the variable capacitor CV3

Q3 3 4 approximately 0

Q4 2 1 approximately 70 kHz

Q5 4 2 the passband increases because the parallel conductance hasincreased

Q6 4 5 619.5 KHz

Q7 3 2 R AND C


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LESSON 902 A B

Q1 4 3 the two peaks are not superimposed

Q2 3 2 connecting RV3, decreasing RV3/RV4 and the coupling

Q3 3 4 the curve disappears because the VCO is not modulated

Q4 2 1 they are more accentuated

Q5 3 4 the coupling coefficient

Q6 4 1 band-pass filters

Q7 3 5 mutual inductance and capacitances

LESSON 903 A B


Q2 3 4 it is narrower

Q3 1 4 because the load resistance across the secondary circuit has been increased by the autotransformer


Q5 4 1 the new bandwidth B3 is very near B1, although it has a load resistance 4 times as low.

LESSON 904

A BQ1 3 2 quadripoles which allow the passage of certain frequencies and elliminate the other frequencies

Q2 2 1 the frequency at which the filter output deviates of 3 dB from the maximum (low-pass and band-pass) or minimum (high- pass and band-rejection) output

Q3 4 1 20 KHz

Q4 3 4 depend on frequency


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LESSON 905 A B



Q3 2 3 at approximately 470 kHz








LESSON 906 A B

Q1 3 4 to increase RV1 slightly, to reduce RV2, to set CV2 to its intermediate position

Q2 4 2 two peaks appear because CV2 is increased


LESSON 907 A B

Q1 3 4 the filter eliminates all the frequencies, excepting a very narrow band. The top of the curve is very narrow and it is not uniform

Q2 4 2 the maximum attenuation is shifted between the two ends of the resonance peak

Q3 1 3 their passband is too narrow


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Q4 3 1 the coupling capacitance and the impedance match

Q5 3 1 four quartz crystals being equal two by two

LESSON 908 A B

Q1 4 2 to transfer the maximum power from the generator to the load

Q2 3 2 the reactive components L and C

Q3 2 1 filter the signal

Q4 3 1 to match different impedances

LESSON 909 A B

Q1 3 1 approximately 190 W

Q2 4 1 low-pass filter




LESSON 924 A B

Q1 4 2 about l5Vpp

Q2 4 3 between 25 and 40

Q3 3 2 between 150 and 250 mW

Q4 4 2 diode D1 in short

Q5 2 1 coil L18 cut off


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LESSON 925 A B

Q1 3 1 the antenna is tuned to the operating frequency and shows its max impedance

Q2 5 3 transistor T2 in short between collector and emitter

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