DMR858 is an ALL-IN-ONE DMR 5W professional walkie talkie. It combined analog and DMR walkie talkie function, and compatible with the walkie talkie in the market. DSP processor , DMR encoder/decoder, RF / Audio Amplifier , PTT, Microphone, 16 Channel switch, Volume adjustment all on board. Connected with power supply and speaker, it build a 5W professional DMR walkie talkie. This product has very good voice quality and very good range. Also special heat sinks are designed specially to guarantee long time talking without any problems.
UHF band frequency：400~470 MHz
VHF band frequency：134~174MHz
350 band frequency：320-390MHz
(3 frequency bands are optional)
(2 voice encoders are optional)
7 Km in open area
Output power up to 5W
Sensitivity up to：-124dBm
Less than 1% BER @ -121dBm
TX/RX frequency set separately
Bandwidth for analogy:12.5 / 25 KHz； Bandwidth for DMR:6.25KHz
Combined DMR / Analog walkie talkie
Support IP confirmed/unconfirmed；SMS. Provide pre-save SMS
1ppm TCXO Crystal
CTCSS: 51 levels； CDCSS: 166 levels
Digital volume :9 class
Analog volume : continuous (stepless)
Encryption for SMS and voice
Support various voice calling types:
Broadcast, group call and private call
Reminder for input calling, calling status checkin
Support enhanced function such as emergency alarm and radio monitor
Support Frequency scan
Support Radio kill and activate
RSSI value read out
Provide PC software to configure
EEPROM inside, parameters stored even powered off
Typical Schematic Circuit:
16 default channels are set before shipping. Channel 0 -7 for DMR channel, channel 8-15 are analog Walkie Talkie. A rotary switch is used to change the channels. And Pin7 –10 output the channel status.
1) Parameters setting
Both Standard mini-USB interface and serial UART interface are used to configure the parameter. Either of them can be used. And we provide PC software which is easy to use to configure all the necessary parameters. Below is the typical connection diagram.
2) Serial Communication Protocol
All the parameters of DMR818 can be configured using Serial Communication Protocol.
MSB for the command.