RM8125 Very tough mobile with amazing features

Relm Radios RM8125 Mobile

This unit has been discontinued, and is no longer available.


Questions? Call Us! 541-621-4588

Includes radio, bracket, power cord and microphone and Owners Manual.


256 or 512 Memory Channels

256 (RM8150) and 512 (RM8125) channels are available. They can be separated into 16 memory banks, of which you can quickly access pre-programmed contingency frequency plans ideal for regional-wide, cross- municipality communications.

Embedded Radio Information

Through programming software, you can get the embedded information in the radio, such as serial number, MCU software and hardware version, last programmed method and time. The radio can save public and private embedded messages or a welcome message for dealer and user’s to recognize.

16 Personal Templates for Channel Settings

To provide personalized communication and adapt to different applications, up to 16 personal templates can be selected for channel settings. In each template, there are many different features that can switched on or off, such as VOX, TX conditions, Call Codes, and so on.

Full Built-in Tone-signaling

All tone-signaling encoder/decoder are built-in, such as CTCSS, DCS, DTMF, 2-Tone or 5-Tone. A wide variety of selective calling systems are available to call specific station or control a repeater.

5/6 Programmable Keys

Up to 5 (RM8150) or 6 (RM8125 )programmable keys could be set as different functions by holding or pressing on it.

Lone Work and Security Check

The radio enters emergency mode if you do not respond to a warning call (Lone Work) or an inquire code (Security Check), adding security and safety for individuals who work remotely and alone.

Remote Kill/Stun/Activate/Revive

If the radio is killed or stunned, all attempts on operation by the user will be ignored. The radio will be activated or revived only when it receives the correct code.

Multiple Emergency Calls

The RM8125/50 can be programmed to different kinds of sound emergency call, when the emergency siren is enabled, the radio will transmit emergency ANI or sound continuously.

Call Authorization

The radio could be programmed as TX forbidden: TX unauthorized or TX allows to be used in different positions in a group.

Flexible Call Operations

To achieve more efficiency in a dispatch situation, a missed call can be transferred to a pre-programmed portable radio or directly call back from a temporarily saved directory.

PLL Steps

2.5kHz, 5kHz, and 6.25kHz could be used for channel frequency assignments for greater efficiency in frequency resources.

High and Low Power

To provide longer communications distance or less power consumption, the RM8125/50 series mobile radio offers 25 Watt and 50 Watt models.

Optional Selection Tone (OST)

The RM8125/50 could be programmed to temporarily select CTCSS/DCS by one pre-programmed key.

Meets MIL-STD 810 C/D/E/F

The RM8125/50 is designed to meet MIL-STD 810 C/D/E/F specifications covering physical and temperature shock, vibration, low pressure, and solar radiation.

Key Lock

When this function is enabled, any operations on the key will be ignored. This helps prevent the undesired operations caused by carelessness.

Lowest Volume Audibility

To prevent missed voice messages caused by the mute operation, Lowest Volume Audibility limits the lowest volume to be an audible level.

Power-on Self-inspection

The radio power-on will be stopped automatically if there are any damages to the radio’s data or hardware.

High/Middle/Low Power Switch

In each channel, RF power can be selected for different applications in programming software or manually by via utilities menu.

Ignition Switch

The radio can be set to be switched on with the ignition of the vehicle or manually for different applications.

Versatile Scanning Features

Up to 16 scan templates for each channel allows different scan list for convenient administration in large work groups. The RM8125/50 series offers both normal and priority scan modes. Most parameters in scan could be customized.

  • Personalized Alert TonePassword
  • Protection
  • PTT ID and Contact List
  • 14 Segments LCD
  • Repeater/Talk Around
  • Busy Channel Lockout (BCLO)
  • Time-out Timer (TOT)
  • Hook Scan Function
  • Dual Home Channels
  • Wired Clone
  • External Our for Horn Drive
  • 4W Front-mounted Speaker
  • Upgradable Software
  • FCS
  • GPS (RM8125)
  • VOX (RM8125)

RM8125 Specifications

  • Frequency Range 136 – 174MHz,
  • 400 – 450MHz, 438 – 490MHz, 470 -512MHz
  • Channels 256
  • Channel Spacing 12.5/25KHz
  • Frequency Stability 2.5ppm
  • Operating Temperature -25°C ~ +55°C
  • Operating Voltage 13.6V DC ± 20%
  • Dimension (H x W x D) mm 150 x 131 x 43mm
  • Weight 1310g


  • Reference Sensitivity 0.28 µ V @ 12.5KHz
  • 0.25 µ V @ 25KHz typical
  • Operating Bandwidth W> ± 7KHz
  • N> ± 3.5KHz
  • First IF of Receiver 49.95MHz
  • Second IF of Receiver 450KHz
  • Adjacent Channel Selectivity 60dB @12.5KHz
  • 70dB @ 25KHz
  • Intermodulation Rejection 65dB
  • Spurious Response Rejection 70dB
  • Rated Audio Power 4W
  • Rated Audio Distortion 5%
  • FM Hum & Noise 40/35


  • RF Power 5W/25W/45W (UHF)
  • 5W/25W/50W (VHF)
  • Frequency Modulation 16K F3E/11K F3E
  • Antenna Impedance 50
  • Modulation Limiting ±2.5KHz @ 12.5KHz
  • ±5KHz @ 25KHz
  • Modulation Distortion < 5%
  • Radiated Spurious Emission -36dBm < 1GHz -30dBm > 1GHz
  • FM Noise -40dB @ 20/25KHz
  • -35dB @ 12.5KHz
  • Adjecent Channel Power -60dB @ 12.5KHz
  • -70dB @ 20/25KHz