RF Comms
Amateur Radio
Learn the radio, the rules, and the people who make a communications network useful.
What it is
Amateur radio is a licensed radio service for learning, experimentation, and communication. In the United States, your license class determines the frequencies and modes you may use. Technician is a common starting point for local VHF and UHF activity; broader HF privileges generally require an upgrade.
You can understand and maintain your own equipment and choose local or direct paths. You still depend on antennas, propagation, power, and other operators; a repeater adds its own infrastructure dependency.
HF, VHF, and UHF
| Category | Meaning | Typical use |
|---|---|---|
| HF: 3–30 MHz | High frequency | Long-distance contacts through ionospheric propagation; conditions, time, and antennas matter. |
| VHF: 30–300 MHz | Very high frequency | Local direct contacts and repeaters, including the 2-meter band. |
| UHF: 300–3,000 MHz | Ultra high frequency | Local contacts and repeaters, including the 70-centimeter band; obstacles affect paths. |
These are frequency categories, not permission to transmit across the whole range. Only specific portions are allocated to amateur use, and license privileges and band plans apply.
Privacy on amateur frequencies
Expect ordinary amateur transmissions to be receivable by others. In the US, FCC rules generally prohibit messages encoded to obscure their meaning, with specific exceptions. Amateur radio serves open coordination and resilience better than confidential messaging.
Keep private account details and sensitive personal information off the air. Do not move encrypted LoRa or Reticulum traffic onto amateur frequencies simply because the hardware can tune there; the service rules must fit the transmission.
Getting started with Technician study
My recommended starting book is Pass Your Amateur Radio Technician Class Test – The Easy Way: 2026–2030 from EasyWayHamBooks. Check that the edition covers the exam pool used on your test date.
The 2026–2030 Technician pool runs from July 1, 2026 through June 30, 2030. Pair study with practice exams and a local club or instructor. After passing, confirm your license grant and privileges before transmitting.
Emergency practice and the server
Listen to local nets, learn procedures, and practice concise check-ins. Learn direct operation as well as repeaters. Build a plan with safe backup power, written contacts, and practice with other people.
A home server can hold station notes, offline manuals, logs, and configuration backups. Compatible radios and interfaces can support permitted packet-radio experiments. Keep essential information on paper or another powered device so a server failure does not take your whole plan with it.