Hytera HM655 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, while the included speaker microphone with a display adds convenience and ease of use. The radio is built to be a dependable communication partner for transportation, utilities, and other professional applications.

Reliable communication
With high receiver sensitivity, the HM655 provides clear and dependable communication even in areas where signals are weak or unstable.

Handheld control head
The HM655 includes a practical speaker microphone with an integrated display and controls. It can be mounted within easy reach, allowing users to power the radio on or off, switch channels or contacts, and adjust volume directly from the microphone.

Superior durability
Designed to withstand harsh environments, the HM655 operates reliably under extreme temperatures, shock, and vibration, meeting MIL-STD-810G standards. It also features IP54 protection against dust and water ingress. The secure 10-pin aviation connector ensures a stable connection between the radio and the palm microphone, while the flexible microphone cable enhances durability and extends 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 × 154 × 164 mm

Weight
1100 g

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

Signal-to-noise ratio
40 dB at 12.5 kHz
43 dB at 20 kHz
45 dB at 25 kHz

Blocking
TIA-603: 90 dB
ETSI: 84 dB

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

Rated audio output power
Internal speaker: 3 W
External speaker: 6 W at 8-ohm load

Maximum audio output power
Internal speaker: 8 W
External speaker: 20 W at 8-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
−36 dBm below 1 GHz
−30 dBm above 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

Adjacent channel power
60 dB at 12.5 kHz
70 dB at 20/25 kHz

Audio distortion
3% or less

Digital vocoder
AMBE+2™

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