Hytera HM685 GPS BT High Power VHF - Professional DMR Mobile Two-way Radio

This new-generation entry-level professional DMR mobile two-way radio is designed to deliver reliable voice and data communication for both in-vehicle and desktop installations. Its compact and lightweight design makes installation simple and convenient. An ergonomic layout with four piano-style buttons ensures intuitive and effortless operation. AI-based noise cancellation technology provides exceptionally clear audio by minimizing ambient noise. Built for versatility, this radio is an ideal communication partner for transportation, commercial operations, utilities, and many other professional environments.

Reliable communication
With high receiver sensitivity, the HM685 delivers clear and dependable communication even in areas with weak or unstable signal coverage.

Digital and analogue compatibility
The HM685 supports both analogue and digital operation, making it an ideal choice for users transitioning from analogue to digital systems with minimal disruption and investment.

Innovative design
Compact and lightweight, the HM685 is easy to install, remove, and operate in vehicles. The front panel uses two-shot molding to improve visual recognition and usability. The transflective display remains easy to read in both low-light conditions and direct sunlight. Below the display, four piano-style keys provide excellent tactile feedback for confident operation.

Wireless connection
With an optional built-in Bluetooth 5.0 module, the HM685 can be used with Bluetooth audio accessories to enhance safety and productivity during in-vehicle communication. The radio can also be programmed wirelessly via Bluetooth, saving time and resources. This feature is available only on the Bluetooth-enabled HM685 version.

Crystal-clear audio
The HM685 delivers outstanding audio clarity in noisy urban streets or on highways. AI-based noise cancellation removes echoes and background sounds such as engine and horn noise, ensuring clear speech transmission. Howling suppression prevents feedback between two radios in the same vehicle, allowing uninterrupted communication while on the move.

Superior durability
Designed for demanding environments, the HM685 operates reliably in extreme temperatures and withstands shock and vibration. It meets MIL-STD-810G standards and IP54 requirements for dust and water resistance. The secure 10-pin aviation connector ensures a stable connection between the palm microphone and the radio, preventing accidental disconnection. The palm microphone cable features excellent elasticity, enhancing durability and extending service life.

General specifications

Frequency range
VHF (V1): 136–174 MHz

Channel capacity
512 channels

Zone capacity
32 zones, with up to 32 channels per zone

Channel spacing
Analogue: 25 kHz / 20 kHz / 12.5 kHz
Digital: 12.5 kHz

Operating voltage
13.6 V ±15% DC

Current consumption (standby)
Less than 0.5 A

Current consumption (transmit)
Less than 2.0 A

Current consumption (receive)
5 W: less than 4 A
25 W: less than 8 A
45 W: less than 12 A

Frequency stability
±0.5 ppm

Antenna impedance
50 ohms

Dimensions (H × W × D)
42 × 159 × 164 mm

Weight
1150 g

Display
1.45-inch display, 4 lines, 320 × 240 pixels

Bluetooth
Bluetooth 5.0 BLE + EDR (hardware option)

Receiver performance

Analogue sensitivity
0.16 μV typical at 12 dB SINAD
0.18 μV at 12 dB SINAD

Digital sensitivity
0.18 μV at 5% BER

Adjacent channel selectivity
TIA-603: 65 dB at 12.5 kHz, 75 dB at 20/25 kHz
ETSI: 60 dB at 12.5 kHz, 70 dB at 20/25 kHz

Intermodulation
TIA-603: 75 dB at 12.5/20/25 kHz
ETSI: 70 dB at 12.5/20/25 kHz

Spurious response rejection
TIA-603: 75 dB at 12.5/20/25 kHz
ETSI: 70 dB at 12.5/20/25 kHz

Hum and noise
40 dB at 12.5 kHz
43 dB at 20 kHz
45 dB at 25 kHz

Rated audio output (internal)
3 W at 20-ohm load

Rated audio output (external)
7.5 W at 8-ohm load

Maximum audio output (internal)
7.5 W at 20-ohm load

Rated audio distortion
3% or less

Audio response
+1 to −3 dB

Conducted spurious emissions
Less than −57 dBm

Transmitter performance

RF output power
High power:
VHF: 5–50 W

FM modulation
11K0F3E at 12.5 kHz
14K0F3E at 20 kHz
16K0F3E at 25 kHz

4FSK digital modulation
12.5 kHz data only: 7K60FXD
12.5 kHz data and voice: 7K60FXW

Conducted and radiated emissions
−30 dBm above 1 GHz
−36 dBm below 1 GHz

Modulation limiting
±2.5 kHz at 12.5 kHz
±4.0 kHz at 20 kHz
±5.0 kHz at 25 kHz

FM hum and noise
40 dB at 12.5 kHz
43 dB at 20 kHz
45 dB at 25 kHz

Audio distortion
3% or less

Digital vocoder
AMBE+2™

Digital protocol
ETSI TS 102 361-1, 361-2, 361-3

Environmental characteristics

Operating temperature
−30 °C to +60 °C

Storage temperature
−40 °C to +85 °C

Electrostatic discharge protection
IEC 61000-4-2, level 4
±15 kV air discharge
±8 kV contact discharge

Dust and water protection
IP54

Humidity resistance
Compliant with MIL-STD-810H

Vibration, drop, and shock resistance
Compliant with MIL-STD-810H