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.
Specification
| Parameters |
Condition |
Min |
Typ |
Max |
Unit |
| Power Supply |
|
3.3 |
8 |
9.0 |
V |
| Working temperature |
|
-30 |
25 |
70 |
℃ |
| Frequency Range |
@UHF |
400 |
|
480 |
MHz |
| @VHF |
134 |
|
174 |
MHz |
| @350 |
320 |
|
400 |
MHz |
| Serial baud rate |
|
|
57600 |
|
bps |
| Current Consumption |
| Sleep current |
|
|
<50 |
|
uA |
| RX Current |
@VCC=8.0V |
|
< 100 |
|
mA |
| TX current |
@VCC=8.0V,5W |
|
< 1.6 |
|
A |
| @VCC=8.0V,3W |
|
<1.1 |
|
A |
| @VCC=4.0V，1.8W |
|
< 1000 |
|
mA |
| @VCC=4.0V,1W |
|
< 750 |
|
mA |
| TX Power |
@high power，4v |
|
1.6 |
|
W |
| @low power,4v |
|
1.0 |
|
W |
| |
@high power，8v |
4 |
5 |
5.5 |
W |
| |
@Low power，8v |
2 |
3 |
3.5 |
W |
| Mic input voltage |
|
|
0.1 |
1.6 |
Vpp |
| RX Sensitivity |
|
|
-124 |
|
dBm |
| BER @DMR mode |
@ -121dBm |
|
1 |
|
% |
| Speaker |
|
2W & 8 ohm |
Features
- UHF band frequency：400~470 MHz
- VHF band frequency：134~174MHz
- 350 band frequency：320-400MHz (3 frequency bands are optional)
- Voice encoder：NVOC
- AMBE++(MOTO compatible) (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 checking
- 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
Application
Typical application circuit
Pin Definition
- DMR858 include 3 parts: DMR858 Functional board
- DMR858PJ control board
- DMR858 heat sinks.
- Connected with power supply and speaker, it can be a professional long range DMR walkie talkie.
- All the 3 parts will be connected together before shipping.
- DMR858 Functional Board Pin Assignment
| Pin No |
Definition |
Description |
| 1, 2, 4 |
GND |
Ground |
| 3 |
MIC_IN |
Microphone input |
| 5 |
UART-RX |
Connected with UART-TX of external device |
| 6 |
UART-TX |
Connected with UART-RX of external device |
| 7, 13 |
GND |
Ground |
| 8 |
CS |
Sleep: 0 ; working: 1 (default when leave open) |
| 9 |
PTT |
TX: 0, RX: 1 ( Default) |
| 10 |
LINE_OUT |
Line out for voice |
| 11 |
T/R |
TX/RX indicator, 1: TX , 0: RX |
| 12 |
SPKEN |
External Voice amplifier on/off, 1: on, 0:off |
| 14, 15 |
+3.3 V |
3.3V output，maximum 50mA loading |
| 16,17,18,19 |
VCC |
VCC (3.3V-9V) |
| 20 |
GND |
Ground |
- DMR858-PJ (Control Board ) Pin Assignment
| Pin No. |
Definition |
Description |
| 1 |
VCC |
VDD (connected to Pin 19 of function board) |
| 2,4 |
GND |
Ground |
| 3 |
CS |
Connect to CS of the function board |
| 5 |
PTT |
Connect to PTT of the function board |
| 6 |
LINE_OUT |
Connect to Line Out of the function board |
| 7 |
8 |
Frequency channel indicator,( 16 channel selected ) 8 :the maximum bit, 4: the 3rd bit, 2: the 2nd bit; 1: the least bit for example : 8421 encoding: 0000: channel 0, 0001: channel 1 0010: channel 2 0011 :channel 3 … 1111 : channel 15 |
| 8 |
4 |
| 9 |
2 |
| 10 |
1 |
| 11 |
SPKN |
Connected with Speaker: 8 Ohm 2W |
| 12 |
SPKP |
| 13,15,17 |
GND |
Ground |
| 14 |
SET |
Setting mode (0: setting mode , 1: normal mode ) |
| 16 |
MIC_IN |
Connect to Mic_IN of the function board |
| 18 |
TXD |
Connect to TXD/RXD of the function board |
| 19 |
RXD |
| 20 |
+3.3V |
3.3V output，can drive 50mA |
| 21 |
SPKEN |
Audio amplifier control |
| 22 |
NC |
NC |
| 23 |
H/L |
Output power control,connect to GND is low power |
| 24 |
GND |
Ground |
Mechanical Dimensions（Unit:mm）
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