Overview
DMR828S is an ALL-IN-ONE DMR 2W professional walkie talkie module. It combined analog and DMR Tier II walkie talkie function. This product is compatible with DMR radio with Moto AMBE++ and all the analog walkie talkie in the market. DMR828S is easy to use , which embedded DSP processor, DMR encoder/decoder, RF / Audio Amplifier, PTT, Microphone, 16 Channel switch, Volume adjustment all on board. Just connected with power supply and speaker, it build a 2W professional DMR walkie talkie. DMR828S has long range and good voice quality. Special heat sinks are designed specially to guarantee long time talking.
The digital intercom supports the following functions in DMR mode:
SMS sending function, support pass-through and SMS application;
Voice encryption function, SMS encryption function;
Calling and called prompts.
Parameters
| Parameters |
Condition |
Min |
Typ. |
Max |
Unit |
| Power Supply |
|
3.3 |
4.0 |
5 |
V |
| Working temperature |
|
-20 |
25 |
60 |
℃ |
| Frequency Range |
@UHF |
400 |
|
470 |
MHz |
| @VHF |
134 |
|
174 |
MHz |
| @350 |
320 |
|
400 |
MHz |
| Serial baud rate |
|
|
57600 |
|
bps |
| Current Consumption |
| Sleep current |
@CS pulled low for 3 seconds |
|
< 1 |
|
mA |
| RX Current |
|
|
< 165 |
|
mA |
| TX current(High power)-DMR |
@VCC=4.2V,2w |
|
400-1200 |
|
mA |
| TX current(Low power)-DMR |
@VCC=4.2V,0.5w |
|
200-600 |
|
mA |
| TX current(High power)-Analog |
@VCC=4.2V,2w |
|
< 1300 |
|
mA |
| TX current(Low power)-Analog |
@VCC=4.2V,0.5w |
|
< 700 |
|
mA |
| Analog Rx Parameters |
| Rx sensitivity (Analog) |
@12dB SINAD |
|
-120 |
|
dBm |
| S/N |
@1.5K deviation |
|
40 |
|
dB |
| Adjacent channel selectivity |
12.5KHz offset |
|
62 |
|
dB |
| Inter modulation Rejection |
12.5KHz offset |
|
63 |
|
dB |
| Blocking immunity |
Interference frequency interval > 1M |
|
88 |
|
dB |
| audio amplitude (line out) |
F0=1KHz |
0.2 |
130 |
460 |
mV |
| output impedance of audio(SPK) |
|
|
8 |
|
Ohm |
| Audio distortion |
F0=1KHz |
|
|
5 |
% |
| Audio response |
300Hz |
|
8 |
|
dB |
| 500Hz |
|
6 |
|
| 1KHz |
|
0 |
|
| 2KHz |
|
-6 |
|
| 3KHz |
|
-12 |
|
| DMR Rx parameters |
| BER（DMR Mode） |
@ -117dBm |
|
4 |
|
% |
| Adjacent channel selectivity（ACS) |
Offset:+12.5kHz |
60 |
|
|
dB |
| Offset:-12.5kHz |
| Intermodulation Rejection |
Offset:+50/100kHz |
63 |
|
|
dB |
| Offset:-50/100kHz |
| Blocking immunity |
Offset:+/-1MHz |
87 |
|
|
dB |
| Offset:+/-5MHz |
| Analog Tx Parameters |
| Max Freq deviation |
12.5KHz deviation（N） |
|
2.2 |
2.5 |
KHz |
| 25KHz deviation（W） |
|
4.5 |
5 |
KHz |
| Sensitivity |
deviation: 1.5KHz/2.5KHz |
4 |
7 |
10 |
mV |
| Audio distortion |
deviation: 1.5KHz/2.5KHz |
|
1 |
5 |
% |
| Modulation characteristic |
300Hz |
-13 |
-11 |
-9 |
dB |
| 500Hz |
-9 |
-6 |
-5 |
dB |
| 1KHz |
-3 |
0 |
1 |
dB |
| 2KHz |
3 |
6 |
7 |
dB |
| 3KHz |
3 |
7 |
11 |
dB |
| CTCSS deviation |
|
350 |
400 |
600 |
Hz |
| output power of adjacent channel |
12.5KHz offset |
-63 |
-65 |
|
dBc |
| SNA |
1.5KHZ/2.5KHZ |
38 |
40 |
50 |
dB |
| DMR Tx parameters |
| frequency error |
|
|
0.5 |
|
ppm |
| 4FSK Tx BER |
|
|
|
≤1×10-4 |
|
| output power of adjacent channel |
+/-12.5kHz |
|
|
≤-55 |
dB |
| output power of next adjacent channel |
+/-25kHz |
|
|
≤-65 |
dB |
FEATURES
- UHF band frequency：400~470 MHz
- VHF band frequency：134~174MHz
- 350 band frequency：320-400MHz (3 frequency bands are optional)
- 5 Km in open area
- Max power output to 2W, low power to 0.5W
- Sensitivity up to：-120dBm
- Less than 2% BER @ -117dBm
- TX/RX frequency set separately
- Bandwidth for analog:12.5 / 25 KHz
- Bandwidth for DMR:6.25KHz
- DMR / Analog walkie talkie
- SMS transmission and reception
- Built-in EEPROM, data saved even powered off
- Low power consumption in sleep mode
- DMR Tier II
- Tail sound eliminationautomatically
- Embedded design for handheldproduct
APPLICATIONS
Typical application circuit
PIN DEFINITION
| Pin NO. |
Pin name |
I/O |
Description |
| 1 |
VCC |
|
VCC ( 3 - 5V ) |
| 2,4 |
GND |
|
Ground |
| 3 |
CS |
I |
0: Sleep; 1: working (high level or leave open) |
| 5 |
PTT |
I |
0: TX, 1: RX |
| 6 |
LINE_OUT |
O |
Audio output without amplified |
| 7 |
8 |
I |
Frequency channel selection,( 16 channels ) |
| 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 |
| 8 |
4 |
0011 :channel 3 |
| 9 |
2 |
… |
| 10 |
1 |
1111 : channel 15 |
| 11 |
SPKN |
|
Audio output, connect to speaker 8Ω 2W |
| 12 |
SPKP |
| 13,15,17,24 |
GND |
|
Ground |
| 14 |
SPKEN |
O |
Valid signal indicator, 1: signal valid, 0: No valid signal received. This pin can be used to drive external voice amplifier. 1: on, 0:off |
| 16 |
MIC_IN |
|
Microphone or line in |
| 18 |
UART-TX |
O |
TXD of the module and connect to external RXD |
| 19 |
UART-RX |
I |
RXD of the module and connect to external TXD |
| 20,21 |
NC |
|
|
| 22 |
HST_TXD |
Reserved |
Serial port to send data pin (for upgrading program) |
| 23 |
HST_TXD |
Reserved |
Serial port receiving data pin (for upgrading program) |
MECHANICAL DIMENSIONS（UNIT:MM）
PIN DEFINITION
