A Beginner’s Guide to GMRS Repeater Frequencies
A Beginner’s Guide to GMRS Repeater Frequencies
Introduction: What Are GMRS Repeaters?
A GMRS repeater (General Mobile Radio Service relay station) is a device that receives and retransmits radio signals to extend communication range. Unlike standard GMRS radios, which operate in simplex mode (direct radio-to-radio), a GMRS repeater system uses duplex communication—receiving on one frequency and transmitting on another—to boost coverage up to 50+ miles.
This guide explains the key GMRS repeater frequencies, how they work, and how to legally use them for better communication.
Understanding GMRS Repeater Frequencies
1. GMRS Repeater Input & Output Channels
GMRS repeaters operate on paired frequencies:
Output (Repeater Transmit): The frequency your radio receives (462.xxx MHz).
Input (Repeater Receive): The frequency your radio transmits (467.xxx MHz).
The standard GMRS repeater frequency pairs are:
| Channel | Repeater Output (MHz) | Repeater Input (MHz) |
|---|---|---|
| RP1 | 462.550 | 467.550 |
| RP2 | 462.575 | 467.575 |
| RP3 | 462.600 | 467.600 |
| RP4 | 462.625 | 467.625 |
| RP5 | 462.650 | 467.650 |
| RP6 | 462.675 | 467.675 |
| RP7 | 462.700 | 467.700 |
| RP8 | 462.725 | 467.725 |
Note: The 5 MHz offset (467.xxx MHz input) prevents interference.
2. Simplex vs. Repeater Frequencies
Simplex (Direct): Uses the same frequency for TX/RX (e.g., 462.550 MHz). Limited to 1-5 miles.
Repeater (Duplex): Uses two frequencies (input/output). Extends range to 20-50+ miles.
3. CTCSS/DCS Tones (Privacy Codes)
Many GMRS repeater stations require CTCSS (PL) or DCS tones to access the system. These prevent interference from unauthorized users.
How to Use GMRS Repeater Frequencies
Step 1: Get a GMRS License
FCC GMRS License ($35, valid for 10 years, covers family members).
No exam required (unlike ham radio).
Step 2: Program Your Radio
Set both input & output frequencies (e.g., 462.550 MHz RX / 467.550 MHz TX).
Add the correct CTCSS/DCS tone (if required).
Step 3: Test the Repeater
Listen first to ensure the repeater is active.
Press PTT and wait for the "kerchunk" (confirmation tone).
Speak clearly—repeaters have a slight delay.
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