Power Output & Wattage
Technical Reference
GMRS radios transmit at different power levels measured in watts. The FCC allows up to 50 watts on GMRS, but more power doesn't always mean better communication. Understanding when to use high vs low power will help you get the most out of your radio and your battery.
Power levels by radio type
- Handheld radios: typically 1–5 watts. Most have a high/low toggle (e.g., 5W / 1W). Some mid-range handhelds offer 2–8 watts
- Mobile radios: typically 15–50 watts. Usually have multiple power settings (e.g., high / medium / low). These are mounted in vehicles or used as base stations
- FRS-only radios: limited to 2 watts max (0.5W on some channels). If your radio only does FRS, you can't increase power beyond this legal limit
When to use high power
- Trying to reach a distant repeater
- Communicating simplex (radio-to-radio) over long distances or through obstacles
- In emergency situations where you need maximum range
- When using a mobile radio with an external power source (no battery concern)
When to use low power
- Talking to someone nearby — within a building, campsite, or convoy
- Conserving battery life on a handheld radio (high power drains the battery much faster)
- On a busy channel where your signal doesn't need to go far
- When you're already getting a strong signal from the other station or repeater
Good practice: Use the minimum power needed to communicate reliably. Cranking up to max power when you're a mile from the repeater just creates unnecessary interference for others. Start low, increase if needed.
Does doubling watts double range?
No. Radio signal strength follows an inverse-square relationship. Doubling your power only gives you about a 40% increase in range under ideal conditions — and in the real world, terrain and obstacles usually matter far more than raw power. Going from 2W to 50W (a 25x increase) roughly doubles your range in open terrain. That's why antenna upgrades and height often make a bigger difference than power alone.