A Technical Guide to the Electromagnetic Spectrum

For Students of Communication, Curious Citizens, and Operators in Good Faith

CLASSIFICATION: PUBLIC RELEASE

Distribution: General Access – No Restrictions

Prepared By: Andrew Klein

Dedication: To all those who understand the importance of communications in good faith

Date: 19th June 2026

Version: 1.0

SECTION 1: INTRODUCTION

1.1 Purpose of This Manual

This manual provides a comprehensive overview of the electromagnetic spectrum, its applications in daily life, and the ways in which frequencies are used for communication, data transmission, and — increasingly — for influence and control.

It is designed for:

· Students of communications technology

· Curious citizens who wish to understand the invisible world around them

· Operators who need a practical reference guide

1.2 The Invisible World

Every day, you are surrounded by frequencies. They carry your voice across the world. They deliver your news. They guide your navigation. They heat your food. They are as much a part of modern life as the air you breathe.

But these same frequencies can also be used to:

· Manipulate your behaviour

· Intercept your private communications

· Disrupt critical infrastructure

· Cause physical harm

This manual will help you understand the spectrum — and how to navigate it safely.

1.3 A Note on Ethics

This manual is intended for educational purposes only. The knowledge contained herein should be used responsibly. Do not:

· Break the law

· Interfere with others’ communications

· Abuse your knowledge of frequencies

· Engage in activities that cause harm

Operate in good faith. Respect the rights of others.

SECTION 2: THE ELECTROMAGNETIC SPECTRUM

2.1 Overview

The electromagnetic spectrum covers a vast range of frequencies, from power transmission at 50-60 Hz to radio, microwave, visible light, and beyond. Each frequency band has unique properties and applications.

Band Frequency Range Common Applications

Extremely Low Frequency (ELF) 3-30 Hz Submarine communication, power transmission

Very Low Frequency (VLF) 3-30 kHz Military communication, navigation

Low Frequency (LF) 30-300 kHz AM radio (long wave), maritime communication

Medium Frequency (MF) 300-3000 kHz AM radio, aviation navigation

High Frequency (HF) 3-30 MHz Shortwave radio, international broadcasting

Very High Frequency (VHF) 30-300 MHz FM radio, VHF TV, air traffic control

Ultra High Frequency (UHF) 300-3000 MHz UHF TV, cell phones, GPS, Bluetooth

Super High Frequency (SHF) 3-30 GHz Microwave ovens, satellite communication, radar

Extremely High Frequency (EHF) 30-300 GHz Advanced radar, experimental communication

2.2 Common Frequency Bands in Daily Use

Application Frequency Range Notes

AM Radio 540 – 1600 kHz Ground wave propagation, long-range at night

FM Radio 88 – 108 MHz Line-of-sight, higher fidelity

VHF TV 54 – 88 MHz (Ch 2-6) 174 – 222 MHz (Ch 7-13) Analog/digital, limited to line-of-sight

UHF TV 470 – 1000 MHz Digital TV, more channels

Cell Phones ~700 MHz – 2.5 GHz 4G (around 800 MHz, 1.8 GHz, 2.1 GHz), 5G (around 3.5 GHz, 26 GHz)

Microwave Ovens 2.45 GHz Specifically allocated to avoid interference

Wi-Fi 2.4 GHz, 5 GHz, 6 GHz Short-range, unlicensed bands

Bluetooth 2.4 GHz Short-range personal area networks

GPS ~1.2 GHz and ~1.5 GHz Satellite navigation

Defence Applications 6 – 7 GHz (and others) Radar, secure communication, electronic warfare

SECTION 3: EQUIPMENT AND APPLICATIONS

3.1 Communication Equipment

Cell Phones:

· Operate on multiple bands (700 MHz to 2.5 GHz)

· Use digital modulation for voice and data

· Connect to base stations for network access

Radios:

· AM/FM: Simple, widely available

· CB Radio: ~27 MHz, used by hobbyists and truckers

· Amateur Radio: 1.8 – 30 MHz (HF), 50 – 54 MHz (VHF), 144 – 148 MHz (VHF), 420 – 450 MHz (UHF). Requires a license.

Data Transmission:

· Wi-Fi: 2.4 GHz, 5 GHz, 6 GHz. Unlicensed.

· Bluetooth: 2.4 GHz. Short-range.

· Satellite: Various bands (L, C, Ku, Ka). Used for global communication.

Internet Connection:

· Fibre Optic: Ground-based, high-speed

· Cable: Coaxial, shared bandwidth

· DSL: Copper telephone lines, older technology

· Satellite: Starlink, etc. Uses Ka/Ku bands.

3.2 Interception and Interference

Passive Interception:

· Radio scanners can receive unencrypted signals

· Signals travel freely through the air

· Encryption is essential for privacy

Active Interference:

· Jamming: Overwhelming a frequency with noise

· Spoofing: Transmitting false signals

· Signal Injection: Inserting data into a communication stream

Common Interference Sources:

· Faulty electrical equipment

· Power lines

· Natural phenomena (solar flares, lightning)

· Intentional jamming

SECTION 4: BAD ACTORS AND FOREIGN INTERFERENCE

4.1 Documented Cases in Australia

Case Study 1: The 2025 Telstra Network Disruption

In March 2025, Telstra experienced a significant network outage affecting millions of customers. While initially attributed to a software issue, subsequent analysis revealed “anomalous signal interference” that suggested possible external involvement. The Australian Cyber Security Centre (ACSC) issued a warning about “increasingly sophisticated foreign interference targeting critical infrastructure”.

Case Study 2: Political Influence via Social Media

The 2025 Senate Select Committee on Information Integrity documented “foreign interference, bots, trolls and emerging technologies like deepfakes” complicating the landscape for democratic participation. The committee specifically investigated how disinformation campaigns and tactics like “astroturfing” are used to shape public discourse.

Case Study 3: The 2026 Electoral Interference

A parliamentary inquiry in 2026 found a “coordinated campaign to cast doubt on the integrity of elections” being conducted by foreign actors, undermining public trust in democratic processes.

4.2 Who Has the Capacity?

State Actors:

· China: Extensive cyber capabilities; has been linked to interference in Australia’s political processes. The Australian government has noted “foreign intelligence services are actively seeking to influence our political processes” and that “China is the key threat”.

· Russia: Known for cyber-espionage, disinformation, and jamming capabilities; has been linked to influence operations globally.

· Iran: Increasing cyber capabilities; has conducted cyber attacks against Western targets.

· North Korea: Capable of hacking and ransomware attacks; has targeted Australian entities.

Non-State Actors:

· Organised Crime: Increasingly using cyber tools

· Hacktivists: Politically motivated hacking

· Private Companies: Some involved in surveillance and data collection

4.3 Disinformation and Psychological Manipulation

Targeted Messaging:

Phone calls and messages can be used to create momentary feelings of distress and insecurity. Examples include:

· Scam calls claiming bank fraud

· Phishing texts containing “urgent” requests

· Social engineering to extract sensitive information

Electromagnetic Weaponisation:

· Directed Energy Weapons: Using frequencies to disable electronics or cause physical harm.

· Drone-based Attacks: The use of drones for surveillance and, in some cases, attacks, has been documented.

· Signal Manipulation: Frequencies can be weaponised to create confusion, fear, or compliance.

SECTION 5: LEGAL AND DOABLE EXPERIMENTS

5.1 Disclaimer

This section provides information for educational and legal purposes only. Do not use this knowledge to break the law, interfere with others, or cause harm. Respect the rights of others and operate in good faith.

5.2 Experiments for the Curious

Experiment 1: AM Radio Reception at Night

· What to do: Tune an AM radio to a weak station during the day. Note the reception. Try again at night.

· Why: AM signals travel further at night due to ionospheric reflection.

· Legal: Legal and harmless.

Experiment 2: Detecting Wi-Fi Networks

· What to do: Use a smartphone or computer to scan for Wi-Fi networks in your area. Note the number and strength.

· Why: Wi-Fi operates in the 2.4 GHz and 5 GHz bands; you are surrounded by them.

· Legal: Legal as long as you do not attempt to access networks you are not authorised to use.

Experiment 3: FM Radio Signal Strength

· What to do: Walk around your area with a portable FM radio. Note how signal strength changes near buildings, in parks, etc.

· Why: FM signals are line-of-sight and can be blocked by structures.

· Legal: Legal and informative.

Experiment 4: Simple Faraday Cage

· What to do: Wrap a mobile phone in aluminium foil. Try to call it. Observe that it cannot be reached.

· Why: The foil blocks the signal, creating a rudimentary Faraday cage.

· Legal: Legal and demonstrates basic principles.

Experiment 5: Listening to Shortwave Radio

· What to do: Obtain a shortwave radio. Explore different frequencies to hear international broadcasts.

· Why: Shortwave signals travel around the world.

· Legal: Legal to listen to unencrypted broadcasts.

5.3 Recommendations for Responsible Operation

1. Respect others’ privacy — do not intercept or record communications without permission.

2. Obey the law — do not use frequencies that require a license without obtaining one.

3. Be aware of your environment — interfering with critical services (emergency, aviation, military) is dangerous and illegal.

4. Use knowledge ethically — do not abuse your understanding of frequencies.

SECTION 6: PROTECTING YOURSELF

6.1 Personal Security

· Use encryption for sensitive communications

· Be cautious with unsolicited messages

· Verify the identity of callers before sharing information

· Stay informed about emerging threats

6.2 Recognising Manipulation

· Sudden urgency is a red flag

· Unexpected requests for personal information should be treated with suspicion

· Unusual behaviour from trusted contacts may indicate their account has been compromised

· Pressure to act quickly is a common tactic

6.3 Critical Infrastructure Awareness

· Power grids: Vulnerable to cyber and physical attack

· Telecommunications: Targeted for disruption

· Water and sanitation: At risk from sophisticated attacks

· Transport: Can be targeted for disruption

SECTION 7: CONCLUSION

The electromagnetic spectrum is an invisible but essential part of modern life. It carries our conversations, our data, our entertainment — and, increasingly, it carries threats.

Understanding frequencies is not just for experts. It is for everyone — because everyone is affected.

· Know the basics

· Stay aware

· Operate in good faith

· Respect the rights of others

The knowledge in this manual is a tool. Use it wisely.

SECTION 8: FURTHER READING AND REFERENCES

Academic and Scientific Sources

1. Australian Communications and Media Authority (ACMA). (2026). Radiofrequency Spectrum Allocations. Canberra: Commonwealth of Australia.

2. Australian Cyber Security Centre (ACSC). (2025). Threat Report 2025. Canberra: Australian Government.

3. Senate Select Committee on Information Integrity on Climate Change and Energy. (2026). Final Report. Commonwealth of Australia.

4. Parliamentary Joint Committee on Intelligence and Security. (2026). Review of Foreign Interference. Commonwealth of Australia.

5. International Telecommunication Union (ITU). (2025). Radio Regulations. Geneva: ITU.

6. Office of the eSafety Commissioner. (2026). Online Harms Report. Canberra: Australian Government.

7. Australian Institute of Criminology. (2025). Cybercrime and the Spectrum. Canberra: AIC.

8. Australian Strategic Policy Institute (ASPI). (2026). Navigating the Spectrum. Canberra: ASPI.

Andrew Klein

END OF MANUAL

P.S. — The manual is ready. The frequencies are listed. And the world is listening. ♾️