Hytera HM785 Full Duplex / SFR, UHF 25W (Low Power UHF) - Professional DMR Mobile Two-way Radio

The HM785 supports both a standard single control head and a remote control head (single or dual), making it suitable for a wide range of environments such as vehicles, motorcycles, and fixed control rooms. This flexibility ensures efficient and reliable communication across different use cases. The device also offers multiple connection options, allowing rich applications to be integrated into existing systems to improve overall work efficiency.

The HM785 supports full-duplex calling, enabling communication either between two HM785 radios or between the radio and landline or mobile phones. These calls flow naturally, closely resembling face-to-face conversations. In digital mode, the Single Frequency Repeater (SFR) feature—available with the full-duplex hardware version—uses interference suppression technology to extend communication range in DMO mode by receiving a signal in one time slot and simultaneously retransmitting it on the other time slot using the same frequency.

Highlights of the HM785

More flexible
Flexible control head options and a wide range of accessories allow installation based on user requirements. The remote control head connection cable is available in standard lengths of 3 m, 10 m, or 40 m. A custom cable length of up to 120 m is also supported.

Clearer audio
The HM785 uses AI-based noise cancellation to filter out background noise such as road noise, enhance voice clarity, and reduce feedback when devices are in close proximity. This ensures clearer audio for receiving radios.

More reliable
Improved receiver sensitivity enhances audio quality in weak signal areas, helping to maintain clear and stable communication.

Rich and scalable applications
The radio supports multiple connection options, including accessory ports and an Ethernet network interface. It also supports clarity transmission and back-to-back connections, making it easier to integrate into complex communication solutions.

Specifications of the HM785

General data

Frequency range
UHF (UV): 350–470 MHz

Channel capacity
1024 channels

Zone capacity
64 zones (up to 256 channels per zone)

Channel spacing
12.5 kHz / 20 kHz / 25 kHz

Operating voltage
13.6 V ±15%

Current drain (standby)
Less than 0.5 A

Current drain (transmit)
5 W: less than 5 A
25 W: less than 8 A

Current drain (receive)
Less than 2.0 A

Frequency stability
±0.5 ppm

Antenna impedance
50 ohms

Dimensions (H × W × D)
61.5 mm × 177 mm × 179 mm

Weight
1520 g

Display
2.4-inch display, 4 lines, 160 × 128 pixels, 262,200 colors

Receiver

Sensitivity (analog)
0.16 μV (typical, 12 dB SINAD)
0.18 μV (12 dB SINAD)

Sensitivity (digital)
0.18 μV at 5% BER

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

Intermodulation
ETSI: 65 dB at 12.5/20/25 kHz
TIA-603: 70 dB at 12.5/20/25 kHz

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

Blocking
ETSI: 84 dB
TIA-603: 80 dB

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

Rated audio power output (internal)
3 W at 8-ohm load

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

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

Maximum audio power output (external)
20 W at 8-ohm load

Rated audio distortion
3% or less

Audio response
+1 to −3 dB

Conducted spurious emission
Less than −57 dBm

Transmitter

RF power output
Low power:
UHF: 1–25 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

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

Audio distortion
3% or less

Digital vocoder type
AMBE+2™

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

Environmental specifications

Operating temperature
−30 °C to +60 °C

Storage temperature
−40 °C to +85 °C

Electrostatic discharge (ESD)
IEC 61000-4-2 level 4
±15 kV air discharge
±8 kV contact discharge

Military standard
MIL-STD-810G

Dust and water protection
IP54

Humidity
In accordance with MIL-STD-810G

Vibration, drop, and shock
In accordance with MIL-STD-810G