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Lesson | Syllabus | Practical | Homework | Book |
| 1 | General communications system. Frequency Division Multiplexing. The inductor. Resonance in an LC tuned circuit | 13.1a, 13.1b, 13.1e, 13.1f(fdm), 13.2div | Finding the resonant frequency of an LC tuned circuit with sig gen & CRO | Calculations on LC tuned circuits | Comm: 6, 7, 13, 26 |
| 2 | Resonance in LC tuned circuit at XL=XC. Calculating L or C for tuned circuit for a particular f0. Frequency response of LC tuned circuit - Q. The form of an AM signal carrier freq., modulation frq., depth of modulation, over modulation. | 13.2di, 13.2dii, 13.2diii, 13.2dvi, 13.2ai, 13.2aii, 13.2aiii | Plotting frq response of LC tuned circuit. Calculating Q. Extension: What determines Q? |
Plotting frq
response of LC tuned circuit applet. Drawing am signals. Determining frequencies and modulation depth from graphs of am signals |
Comm: 26, 27, 17, 18 |
| 3 | Impedance matching. The simple am radio. Calculating component values in an am radio. | 13.2ci, 13.2ciii | Building a crystal set Extension: Adding an af amplifier. | Designing radio with component values for HF | Comm: 22, 23 |
| 4 | Spectrum of am signal. Bandwidth. Frequencies of am broadcast bands. Bandwidth and channel capacity. | 13.2aiv, 13.2av, 13.2bi, 13.2bii, 13.2biv, 13.1d | Demo of am wave and spectrum using picoscope. | Drawing am spectra from values or graph of time domain signal | Comm: 19-22 (excluding fm) |
| 5 | Spectrum of am signal. Bandwidth. Frequencies of am broadcast bands. Bandwidth and channel capacity. | 13.2aiv, 13.2av, 13.2bi, 13.2bii, 13.2biv, 13.1d |
Making
a radio on a pcb Drawing am spectra from values or graph of time domain signal |
Comm: 19-22 (excluding fm) | |
| 6 | Selectivity and sensitivity, Increasing Q to improve sensitivity and problems. Using rf amp to improve sensitivity. The am transmitter. | 13.2v, 13.2dvii | Building a simple am transmitter | Comm: 16, 26 | |
| 7 | The superhet. Revision of signal spectra. Drawing a spectrum from information about signals into a mixer. Advantages of superhet over TRF. | 13.2e, 13.2biii | Using a mixer to change voice | Questions on superhet block diagram and calculations of input and output frequencies of mixer. Drawing spectrum from mixer. | Comm: 27-30 |
| 8 | The form of the fm radio signal. Spectrum and bandwidth of fm. Advantages of fm over am. Stereo, traffic announcements and RDS. Slope detector. | 13.2avi, 13.2avii, 13.2aviii | Demo of fm wave and spectrum using picoscope. Compare with am. | Calculations on fm spectrum. Questions on noise in am & fm | Comm: 20 - 22 |
| 9 | Aerials. Noise, distortion and cross talk. SNR and dB scale. | 13.2.cii, 13.1g, 13.1h | Making a tv aerial | Designing aerials | Comm: 24, 25, 14, 15 |
| 10 | Test on analogue radio. TDM | Calculations on number of stations on TDM channel | 1Comm: 3, 14 | ||
| 11 | Multiplexing. Demultiplexing. Designing a multiplexer and demultiplexer (revision of Boolean logic and TTs). TDM | 13.4e, 13.1f | Using a multiplexer and demultiplexer for TDM | Designing a large multiplexer | Comm: 47-57 |
| Half-term | |||||
| 12 | Theory of mobile phones including revision of TDM & FDM. Cellular structure. | 13.3 | Use web to map local cell structure. | Read up mobile phone theory and prepare questions for visit. | Comm: 31-38 |
| 13 | Visiting an O2 mobile phone base station. Talk from engineer. | 13.3 | Visit. | Write up visit using images for display | Comm: 31-38 |
| 14 | PWM | 13.4bii | Building a dimmer switch. Extension: temp dependent speed control for motor. | Drawing PWM waveforms for given analogue signal | Comm: 41 |
| 15 | Digital communications. Digital vs analogue communications. PAM and Nyquist's theory. | 13.4bi, 13.4bv | Using a sample and hold chip to investigate Nyquist's theory | Calculations using Nyquist | Comm: 39-40 |
| 16 | PCM. 8-bit DAC. | 13.4biv, 12.5d | Build 4-bit DAC and attach 4-bit counter to observe digital ramp. Extension: change ramp direction, step size and build astable | Calculations on DAC. PCM problems |
Comm:
39-41 Control: 48 |
| 17 | ADC via DAC, Flash ADC. Flash vs digital ramp ADC | 12.5f, 12.5e, 12.5h | Use last lessons DAC to build an ADC. Extension: Make a voltmeter | Control: 49 - 52 | |
| 18 | ADC via DAC, Flash ADC. Flash vs digital ramp ADC | 12.5f, 12.5e, 12.5h | Use last lessons DAC to build an ADC. Extension: Make a voltmeter | ||
| 19 | Serial data transmission. Start and stop bits. | 13.4c, 13.4d | Magnetic card reading. Output from COM port. Smart card. Keyboard and mouse. | Drawing serial data waveforms. | Comm: 42-47 |
| 20 | Revision of shift register. Bit rate and baud rate. PPM and IR remote control. | 13.4biii | Using a serial to parallel shift register to light a series of LEDS. Extension make a continuous sequence | Calculations on bit and baud rate. | |
| 21 | Test on digital communications. | Look at output of IR remote control on storage scope | |||
| 22 | Feedback systems (e.g. heating control). Open loop vs closed loop. Problem of jitter. Non-inverting Schmitt trigger. | 12.6 | Build a non-inverting Schmitt trigger | Calculate trigger thresholds of Schmitt triggers | Control: 55 - 59 |
| 23 | Inverting Schmitt trigger. Non symmetric thresholds. | 12.6 | Build relaxation oscillator | Design Schmitt trigger with given thresholds | |
| 24 | Introduction to QBASIC | 12.3 | Write program to calculate resistor value for LED and frequency of 555 astable | Write program to display times tables | Control: 21 - 31 |
| 25 | Introduction to QBASIC | 12.3 | Write program to calculate resistor value for LED and frequency of 555 astable | Write program to display times tables | |
| Xmas | |||||
| 26 | Polling with INKEY$ using Do-Loop_Until. The Centronics port. Polling vs interrupts. Outputting from the printer port. Wasting time. Subroutines. Computer architecture. | 12.2, 12.3, 12.5c | Write a program to move a "*" backwards and forwards across the screen. Designing a set of traffic lights. | Control: 31-34, 42-45 | |
| 27 | Polling with INKEY$ using Do-Loop_Until. The Centronics port. Polling vs interrupts. Outputting from the printer port. Wasting time. Subroutines. Computer architecture. | 12.2, 12.3, 12.5c | Write a program to move a "*" backwards and forwards across the screen. Designing a set of traffic lights. | Control: 31-34, 42-45 | |
| 28 | Inputting and masking. Using arrays and declaring variable types. Introduction to the microcontroller - Harvard Architecture. Using the microcontroller. | 12.2, 12.3 | Write a program for a pelican crossing on the printer port. Write a program to make a set of running lights with speed controlled by switches on the microcontroller. Extension: Programming in C | Control: 31-34, 42-45 | |
| 29 | Hexadecimal test. Using a seven segment display with a microcontroller. | 12.7 | Use a microcontroller and 7-seg display on a breadboard to build a stopwatch. Using a microcontroller on a breadboard. | Control: 67-68 | |
| 30 | Photo-diode/opto switch. Shaft encoder | 12.7 | Build a two bit shaft decoder | Control: 60-63 | |
| 31 | Photo-diode/opto switch. Shaft encoder | 12.7 | Build a two bit shaft decoder | Control: 60-63 | |
| 32 | Tri-state and data latches. | 12.5ab | Attaching two inputs to a microcontroller. Using a 75xx175 latch to hold a number on a display. | Control: 41-42 | |
| 33 | Projects | ||||
| 34 | Projects | ||||
| Half-term | |||||
| 35 | Projects | ||||
| 36 | Projects | ||||
| 37 | Projects | ||||
| 38 | Projects | ||||
| 39 | Projects | ||||
| 40 | Projects | ||||
| 41 | Projects | ||||
| 42 | Projects | ||||
| 43 | Projects | ||||
| 44 | Projects | Write up project. You can use this writing framework. | |||
| Easter | |||||
| 45 | Stepper motor control | 12.7 | Control a floppy disc stepper motor and make a second hand on a clock | Stepper motor questions | Control: 63-67 |
| 46 | Interrupts and polling. Memory mapped I/O. Tristates | 12.3 | Demonstrate projects | ||
| 47 | Neural networks | 12.4 | Computer exercise | Control: 35-40 | |
| 48 | Practise Exam | ||||
| 49 | Dot matrix display bs | 12.7 | Displaying letters on dot matrix display. Drawing on the CRO screen with a microcontroller. | Control: 68-73 | |
| 50 | No lesson | ||||
| 51 | Attaching an ADC to a microcontroller | 12.5g | Reading temperature from a parallel port. | ||
| 52 | Revision | ||||
| 53 | Revision | ||||
| 54 | Revision | ||||
| 55 | Revision | ||||
| 56 | Revision | ||||
| 57 | Revision | ||||
| 58 | Revision | ||||
| 59 | Revision | ||||
| 60 | Revision | ||||
| Half-term | |||||
| 61 | Feedback from test (Group 2 feedback in workshop) | Making a radio on a pcb | |||