Hytera HM785 User Manual

55
9. Troubleshooting
Phenomena Analysis Solution
The radio cannot be turned
on.
The power cord may be unconnected. Connect the power cord properly .
The radio cannot be
registered.
The radio cannot detect signal from the BS.
Make sure the radio is within the
coverage of the BS.
The radio may not be authorized.
Contact the BS manager to check
whether the radio is authorized in the
network management system.
The radio is registered
repeatedly.
The signal may be intermittent.
Make sure that
the radio is within the
coverage of the BS.
The radio cannot establish
a call.
The signal may be weak.
Make sure that
the radio is within the
coverage of the BS.
No voice is heard after a
call is established.
The radio ID may be repeated.
Contact the BS manager to check
whether the radio ID is repeated in
the network management system.
The called party
disconnects repeatedly
during communication.
The signal may be intermittent or weak.
Make sure that the radio is within
the
coverage of the BS.
The voice is unclear. The signal may be weak.
Make sure that call participants are
within the communication range.
During receiving, the voice
is weak, discontinuous, or
totally inactive.
The battery voltage may be low. Recharge or replace the battery.
The volume may be low.
Increase the volume, or contact your
dealer to disable the Mic AGC
feature.
The antenna may be loosened or installed
improperly.
Turn the radio off, and then reattach
the antenna.
The speaker may be blocked or damaged. Clean the surface of the speaker.

Hytera HM785 Specifications

General

Channel Capacity	1024
Operating Voltage	13.6 V ± 15%
GPS	Yes
Bluetooth	Yes
Channel Spacing	12.5/20/25 kHz
Operating Temperature	-30°C to +60°C
Frequency Stability	±0.5 ppm
Antenna Impedance	50 Ω
Modulation Limiting	±2.5 kHz @ 12.5 kHz; ±4.0 kHz @ 20 kHz; ±5.0 kHz @ 25 kHz
Audio Distortion	≤3%
Intermodulation	≥65dB
Spurious Response Rejection	≥70dB
IP Rating	IP54
Frequency Range	UHF: 400-527MHz
Display	2.4-inch
Digital Protocol	DMR
FM Hum & Noise	≥40dB
Adjacent Channel Power	≥60dB
Audio Response	+1~-3dB
Conducted & Radiated Emission	-36dBm ＜1GHz; -30dBm ＞1GHz
Adjacent Channel Selectivity	≥60dB
Zone Capacity	64 (each with a maximum of 256 channels)
Sensitivity (Analog)	0.22 μV (12 dB SINAD)