Plain-English Definitions for Preppers, Off-Gridders, and First-Time Users

Just got your first radio? Or trying to follow a radio video or forum and it’s like people are speaking a whole different language? You’re not alone. The world of radio is filled with terms, acronyms, and jargon that can feel like a barrier — but once you learn the basics, everything clicks fast.

This guide from our team at Ready Radio gives you clear, simple definitions for the most common radio terms, so you can actually understand what you're hearing and start using your gear confidently.

Why You Should Have a Radio

Radios are a critical part of any EDC or go-bag because they provide reliable communication when cell phones fail. While you may think that cell phones failing is not a threat, think about emergencies like natural disasters, riots, or other scenarios where your phone signal has been weak or nonexistent. During emergencies, cellular networks can become overloaded or disabled, but radios operate independently of towers and internet access.

They allow instant, real-time communication, making coordination faster and more effective than texts or calls. Radios also improve situational awareness by letting users monitor weather alerts and local emergency channels.

Durable, energy-efficient, and subscription-free, radios support true self-reliance—ensuring you can stay informed and connected when it matters most.

Essential Radio Terms (In Plain English)

Frequency

The specific number (measured in MHz) your radio uses to transmit or receive.

Example: 146.520 MHz is a common HAM simplex frequency.

Channel

A preset frequency slot. Most consumer radios label frequencies as “channels” (e.g., Channel 1 = 462.5625 MHz on GMRS).

Simplex

Direct radio-to-radio communication on a single frequency.

No repeater, just two radios talking to each other.

Duplex / Repeater Use

Your radio transmits on one frequency and receives on another to use a repeater, which extends range.

Example: You transmit on 146.100 MHz, receive on 146.700 MHz.

Offset

The difference (usually in MHz) between your transmit and receive frequencies when using a repeater.

Tone / PL Tone / CTCSS / DCS

Privacy tones that keep you from hearing other users — but don’t prevent them from hearing you.

If the tone doesn't match on both radios, they won't hear each other.

Squelch

A setting that mutes background static until a strong enough signal is received.

Lower squelch = more range, but more noise.
Higher squelch = less noise, but weaker signals get blocked.

Call Sign

Your FCC-issued ID if you're a licensed HAM operator (e.g., W1AW). Used to legally identify yourself on the air.

Push-to-Talk (PTT)

The button you press to transmit your voice.

Speak clearly while holding it down — then release to listen.

Modulation (AM/FM/SSB)

The way your voice is transmitted over the air. Most common:

• FM = Used on most VHF/UHF radios (GMRS, HAM)

• AM/SSB = Used in CB or HF radios

Line of Sight (LOS)

Radio waves travel straight — so trees, hills, and buildings block range. The higher your antenna, the better your LOS.

Repeater

A station that rebroadcasts your signal from a high location to extend range. Great for HAM and GMRS comms over long distances.

Antenna Gain

How much your antenna focuses your signal.

Higher gain = more range horizontally
Lower gain = more coverage in hills or urban areas

Bandwidth

The space a signal takes up on the frequency spectrum.

Narrowband (12.5 kHz) and wideband (25 kHz) are most common.

Dual-Band Radio

A radio that operates on two bands — usually VHF (2m) and UHF (70cm).

Handy for HAM operators and local comms.

SWR (Standing Wave Ratio)

A measurement of antenna efficiency.

High SWR = signal bouncing back into your radio (bad)
Low SWR = efficient transmission (good)

Handheld (HT)

Short for "Handie-Talkie."

Your standard walkie-talkie-style portable radio.

Mobile Radio

A radio designed for vehicle or home mounting. More power, more range than a handheld.

Base Station

A stationary radio setup, often with an external antenna and power supply. Ideal for off-grid comms and homesteads.

---

Bonus: Common Radio Phrases

---

Final Thoughts

Learning radio terms doesn’t have to feel like decoding a secret language.
Once you get the hang of it, you’ll communicate more clearly, troubleshoot faster, and operate more confidently — especially in off-grid or emergency situations.

Print this guide. Share it with your group. And start sounding like someone who knows what they’re doing — because you will.

Be sure to check out Ready Radio on Instagram!