Are these Analog Communication handwritten notes free?

Yes. Fill in the short form on this page and the PDF downloads right away. There is no fee for the notes.

Are these official university notes?

No. These are original Uncodemy revision notes for Analog Communication. They are not issued or approved by AKTU or any other university, and they are not past papers.

Which syllabus do they follow?

They follow the common B.Tech syllabus for Analog Communication used by most Indian universities, including AKTU and colleges on the AICTE model curriculum. Unit order and depth differ, so match the notes with your own university syllabus.

Are these notes enough for GATE EC?

They are good for revising GATE EC basics such as AM power, Carson's rule, image frequency and noise figure. For GATE you also need a standard textbook and plenty of practice questions.

Is digital communication included?

No. This PDF covers analog communication only. Digital communication has its own notes and important questions pages.

Analog Communication Handwritten Notes PDF

Key takeaways

Eight units, from why we modulate to pulse modulation and multiplexing.
AM power, efficiency and SSB power saving are explained with solved numericals.
FM bandwidth with Carson's rule and the Bessel-function spectrum are covered.
Receivers, image frequency, noise figure and the Friis formula have their own unit.
Original Uncodemy revision notes, not official university notes. Check your own syllabus.

About these handwritten notes

These Analog Communication notes are original Uncodemy revision notes, written in a clean handwritten style so they are quick to read before an exam. They follow the common B.Tech syllabus for Analog Communication (B.Tech ECE and GATE EC basics). They are not official university notes and not copied from any textbook or past paper.

Topic order, unit numbers and depth vary between universities, so first place each unit below against your own university syllabus. If your syllabus has a topic that is missing here, add it in the margin from your class notes or textbook. Use these notes for revision after you have studied the topic once in class, not as your only study material. They are short on purpose: the aim is to help you recall the main ideas, formulas and diagrams quickly, so that your exam time goes into writing good answers.

What's inside the Analog Communication notes

The PDF is organised in the same order most universities teach the subject. Each unit has short definitions, comparison tables, formula boxes and exam tips.

Unit 1: Introduction. Elements of a communication system and why modulation is needed: antenna size, multiplexing and range.
Unit 2: Amplitude Modulation (DSB-FC). AM wave, modulation index, power and efficiency relations, AM generation and envelope detection.
Unit 3: Suppressed Carrier Systems. DSB-SC, SSB and VSB, coherent detection, SSB generation methods and power saving compared with AM.
Unit 4: Angle Modulation (FM and PM). Frequency deviation, modulation index, Carson's rule, FM generation and detection, and an AM vs FM table.
Unit 5: Radio Receivers. TRF and superheterodyne receivers, intermediate frequency, local oscillator and image frequency.
Unit 6: Noise. Thermal and shot noise, noise figure, noise temperature and the noise performance of AM, DSB-SC, SSB and FM.
Unit 7: Random Processes (basics). Mean, autocorrelation, power spectral density and white noise as used in communication.
Unit 8: Pulse Analog Modulation and Multiplexing. PAM, PWM and PPM, plus FDM and TDM basics.

The last page of the PDF lists the most asked practice questions for the whole subject, so you can test yourself after finishing all the units.

Formulas and solved examples in the PDF

Formula boxes cover AM total power, transmission efficiency, the SSB-SC saving over AM, Carson's bandwidth and the thermal noise voltage 4kTRB. Solved examples include an AM power numerical, an FM bandwidth numerical, an image-frequency calculation for a 1000 kHz station with a 455 kHz IF, and a thermal noise voltage for a 1 kΩ resistor.

How to revise Analog Communication with handwritten notes

Handwritten-style notes work best when you read actively. Keep a pen and a rough notebook beside you, cover the formula or diagram, and try to write it yourself before you look.

Draw the AM, DSB-SC and SSB spectra side by side. Most comparison questions are answered by these three sketches.
Keep one page for power relations: Pt = Pc(1 + μ²/2) and the efficiency at μ = 1. Derive them once, then recall them.
For FM, practise Carson's rule with two or three different Δf and fm values until it is automatic.
Redraw the superheterodyne block diagram from memory and label where the image frequency comes from.

In the last week, read only the formula boxes and exam tips, and solve one numerical or long question per unit from memory. If you study with friends, ask each other to explain one diagram or derivation aloud. Explaining a topic is the fastest way to find the gaps in it.

A short revision plan

If your exam is about a week away, this plan covers every unit in the PDF once and leaves time for practice. Stretch it over two weeks if you are starting from scratch.

Day 1: Introduction, Amplitude Modulation (DSB-FC).
Day 2: Suppressed Carrier Systems, Angle Modulation (FM and PM).
Day 3: Radio Receivers, Noise.
Day 4: Random Processes (basics), Pulse Analog Modulation and Multiplexing.
Day 5: Solve the practice questions in the exam focus section below, one per unit, without the notes.
Day 6: Read only the formula boxes and exam tips, redo the numericals you got wrong, and sleep early.

Common mistakes to avoid

Using the peak carrier voltage where the RMS value is needed in power formulas. Check which one the question gives.
Forgetting that the image frequency is the signal frequency plus twice the IF, not plus one IF.
Mixing up frequency deviation Δf and modulation index β in Carson's rule.
Writing the SSB power saving without stating the modulation index it applies to.

How Analog Communication links to other subjects

Analog Communication builds on Signals and Systems, especially the Fourier transform and spectra. It leads into Digital Communication, where sampling, noise and modulation ideas are reused, and into Wireless and Mobile Communication.

Exam focus: high-weightage topics

In most university papers, AM power and efficiency, the comparison of AM, DSB-SC, SSB and VSB, FM bandwidth and the superheterodyne receiver carry the most marks. Noise figure and the Friis formula are common long questions.

Typical long and numerical questions to practise:

Derive the power relation and efficiency of AM, then solve a power numerical.
Explain envelope detection and the condition on the RC time constant.
Explain SSB generation by the phase-shift method.
Derive the spectrum of single-tone FM using Bessel functions.
Draw a superheterodyne receiver and find the image frequency for a given station.
Define noise figure, derive the Friis formula and compare the noise performance of AM and FM.

When you write a long answer, start with a one-line definition, draw the diagram or circuit, write the derivation in clear steps and end with the final result and its unit. For numericals, write the formula first, then substitute, so you can still earn step marks if the arithmetic slips.

These are practice questions based on common syllabus topics. They are not verified past papers, and we do not claim any question will appear in your exam. For real previous papers, use your university's official archive.

Who these notes are for

These notes are for B.Tech ECE students preparing for their Analog Communication semester exam, and for students revising GATE EC basics such as AM power, Carson's bandwidth and noise figure. They are also useful before core electronics interviews where modulation questions come up. If you are preparing for GATE, use them with a standard textbook and a full set of practice problems.

Download Analog Communication Handwritten Notes PDF