Comprehensive Academy Disclaimer

1. Radio Frequency (RF) Electromagnetic Radiation Safety

Radio transmitters, linear amplifiers, and directional antenna systems generate electromagnetic fields (EMF). While amateur radio signals operate within the non-ionizing portion of the electromagnetic spectrum, high-power transmissions (particularly exceeding 50 Watts on VHF, UHF, or microwave frequencies) can produce localized biological heating.

Cadets and radio operators must always calculate Maximum Permissible Exposure (MPE) and Minimum Safe Distance guidelines (FCC OET Bulletin 65 / ICNIRP standard). Never touch, adjust, or approach an antenna element while radio frequency energy is actively radiating.

2. High Voltage, Lightning & Tower Safety Precautions

Vacuum tube power amplifiers, power supply filter capacitors, and transformer circuits contain lethal direct current (DC) potentials ranging from 300V to upwards of 3,500V DC. Such voltages remain stored even after equipment is disconnected from the AC mains.

3. Examination, Licensing & Legal Transmission Authority

S21AMF International Amateur Radio Academy is an independent educational preparatory institution founded and directed by Dr. Sheikh Md. Mahtabur Rahman (Callsign: S21AMF).

Completion of academy courses, interactive quizzes, or mock examination simulators does NOT constitute a government-issued Amateur Radio Operator License or grant authorization to transmit (TX) on international amateur frequency allocations. All radio transmissions require a valid license and assigned callsign issued by your sovereign national regulatory body (e.g., Bangladesh Telecommunication Regulatory Commission - BTRC, Federal Communications Commission - FCC, Ofcom, or equivalent).

4. Professional Medical Disclaimer

Although the founder of S21AMF Academy, Dr. Sheikh Md. Mahtabur Rahman, is a registered Medical Doctor, this platform is dedicated exclusively to telecommunication engineering, radio science, electronics, and amateur radio examination preparation.

No content, curriculum material, response, or publication on s21amf.com or within our mobile application constitutes medical advice, clinical diagnosis, healthcare instruction, or treatment. Users seeking medical guidance must consult a qualified healthcare professional.

5. General Educational Purpose & Limitation of Technical Warranties

All technical formulas, antenna calculators, frequency band tables, solar propagation indices, and circuit schematics are provided strictly for educational, research, and non-commercial study. While we strive for uncompromising accuracy and alignment with ITU Region 3 standards, information is provided on an "as-is" and "as-available" basis without warranties of any kind.

6. Third-Party Advertisements & External Links (Google AdSense)

This website and its companion mobile application may display advertisements served by Google AdSense, Google AdMob, and verified advertising networks.

• The appearance of commercial advertisements does not constitute an endorsement, guarantee, or recommendation by S21AMF Academy of the products or services advertised.
• Our articles and resources may link to external websites (such as ITU, ARRL, NOAA Space Weather, BTRC, or NASA). We have no editorial control over, and accept no liability for, the content, privacy practices, or availability of third-party domains.

7. Emergency Communications (EmComm) Protocols

Concepts covered in disaster preparedness modules (ARES/RACES disaster net architectures, off-grid power deployment) are intended for secondary civil protection and humanitarian assistance. Radio operators must coordinate with official emergency authorities and never interfere with primary government, police, military, or life-safety frequency bands.