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DMR818S-U : FCC ID & CE RED Certified DMR Tier II AMBE++ Walkie Talkie Module
Type: DMR Walkite Talkie,DMR Walkie Talkie
Certification: FCC ID,CE-RED
Output Power: 2W
Size (mm):39.5*24
HOME > PRODUCTS > WALKIE TALKIE MODULES > DMR858M: DMR DUAL TIME SLOT ANALOG-DIGITAL INTEGR...
DMR858M: DMR Dual Time Slot Analog-Digital Integrated 5W Walkie-Talkie
DMR858M is a cost-effective 5W full-function digital walkie-talkie module developed by NiceRF. It is compatible with analog walkie-talkie commonly used in the market and features the DMR Tier II digital walkie-talkie functionality. The module comes with an integrated Moto AMBE++ vocoder. Inside the module, components such as the microcontroller, digital walkie-talkie chip, RF power amplifier, and audio amplifier are all integrated. Customers only need to connect external components like power supplies and speakers to use it as a small digital walkie-talkie with 16 adjustable frequency channels. The module's ultra-compact size also allows for easy and quick embedding into various handheld devices, enhancing the overall performance of end products.
DMR858M strictly uses lead-free technology for production and testing, complying with RoHS and Reach standards。
Parameters | Test condition | Min. | Typ. | Max. | Unit. |
Voltage range | 3.7 | 8.0 | 8.5 | V | |
Operating Temperature | -20 | 25 | 60 | ℃ | |
Frequency range | @UHF | 400 | 470 | MHz | |
@VHF | 134 | 174 | MHz | ||
@350 | 320 | 400 | MHz | ||
Uart baud rate | 57600 | bps | |||
Current Consumption | |||||
Sleep current | @CS pulled low for 3 seconds | < 0.1 | mA | ||
Rx current | < 165 | mA | |||
Tx current （high power） | @VCC=8V,5W | 900 | mA | ||
Tx current （high power） | @VCC=8V,5W | 1700 | mA | ||
Tx current （low power） | @VCC=8V,2.5W | 640 | mA | ||
Tx current （low power） | @VCC=8V,2.5W | 1000 | mA | ||
Sensitivity and Audio | |||||
Rx sensitivity (Analog) | @12dB SINAD | -120 | dBm | ||
Receiving BER(DMR modulation) | @ -117dBm | 5 | % | ||
Receiving S/N | 1.5K Frequency Deviation | 40 | dB | ||
Adjacent Channel Selectivity | 12.5KHz Channel Spacing | 62 | dB | ||
Intermodulation Immunity | 12.5KHzChannel Spacing | 63 | dB | ||
Blocking Immunity | Interference Frequency Interval > 1M | 88 | dB | ||
Audio Output Amplitude (Lineout) | F0=1KHz | 0.2 | 130 | 460 | mV |
Audio Output Impedance (SPK) | 8 | Ohm | |||
Audio Distortion | F0=1KHz | 5 | % | ||
Audio Response | 300Hz | +8 | dB | ||
500Hz | +6 | ||||
1KHz | 0 | ||||
2KHz | -6 | ||||
3KHz | -12 | ||||
Digital Receiving | |||||
Receiving BER(DMR modulation) | @ -117dBm | 4 | % | ||
Adjacent Channel Selectivity (ACS) | Offset:+12.5kHz | 60
| dB
| ||
Offset:-12.5kHz | |||||
Intermodulation | Offset:+50/100kHz | 63
| dB
| ||
Offset:-50/100kHz | |||||
Blocking | Offset:+/-1MHz | 87 | dB | ||
Offset:+/-5MHz | |||||
Analog Transmission | |||||
Max Modulation Deviation | 12.5KHz Frequency Deviation（N） | 2.2 | 2.5 | KHz | |
25KHz Frequency Deviation（W） | 4.5 | 5.0 | KHz | ||
Modulation Sensitivity | 1.5KHz/2.5KHz Frequency Deviation | 4 | 7 | 10 | mV |
Audio Modulation Distortion | 1.5KHz/2.5KHz Frequency Deviation | 1 | 5 | % | |
Modulation Characteristics | 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 modulation frequency offset | 350 | 400 | 600 | Hz | |
Receiving SNR | 1.5kHz/2.5kHz Frequency (N/W) | 38 | 40 | 50 | dB |
Digital Emission | |||||
Frequency Error | 0.5 | ppm | |||
4FSK Transmission BER | ≤1×10-4 | ||||
Adjacent Channel Power (dB) | +/-25kHz | ≤-68 | dB | ||
Features of DMR Walkie Talkie Module DMR858M
- UHF band frequency: 400~470 MHz
VHF band frequency: 134~174 MHz
350 band frequency: 320~400 MHz - Distance up to 7-8Km
- power output:5W, low power:2W
- High Sensitivity: -120dBm
- Bit error rate down to 5% under -117dBm
- Analog Bandwidth: 12.5 / 25 KHz Digital Bandwidth:6.25KHz
- Message transmission and reception
- DMR/ Analog walkie talkie
Built-in standard DMR protocol
Supports SMS sending function
Supports low power sleep mode
Dual time-slot walkie-talkie, repeater compatible
Tail sound elimination automatically
Highly integrated, cost-effective
Compact design, easy to embed
Applications of DMR Walkie Talkie Module DMR858M
- DMR walkie talkie module
- Invisible intercom system
- Building security system
- Audio surveillance system
DMR Mode of DMR Walkie Talkie Module DMR858M
- Message transmission and reception.
- Enhanced encryption of Voice and Text message.
- Various voice call types: All call, Group call and Private call;
- Reminder for input calling, calling status checking
- Emergency alarm and radio monitor;
- Repeater
Pin NO. | Pin name | Description |
1 | VCC | Positive supply |
2,4 | GND | Ground |
3 | CS | Module sleep enable pin, "0" for sleep mode, "1" for active mode |
5 | PTT | Transmit/receive control pin, "0" for transmit mode, "1" for receive mode, default is receive mode |
6 | LINE_OUT | Audio output |
7 | 8 | 16 Channels, Code 8421, 8th，default output “1” |
8 | 4 | 16 Channels, Code 8421, 4th，default output “1” |
9 | 2 | 16 Channels, Code 8421, 2nd，default output “1” |
10 | 1 | 16 Channels, Code 8421, 1st，default output “1” |
11 | OUTP | Audio output, connect to speaker 8Ω 2W and 4Ω 5W |
12 | OUTN | Audio output, connect to speaker 8Ω 2W and 4Ω 5W |
13 | MIC- | Negative terminal of the external microphone |
14 | MIC+ | Positive terminal of the external microphone (internal bias provided, no additional power supply required) |
16 | SPKEN | Receive indicator pin, normally low, turns high when a signal is received |
18 | TXD | Serial data transmission port |
19 | RXD | Serial data transmission port |
20,23,24 | NC | |
21 | HST_TX | Serial data transmission pin (used for firmware upgrade) |
22 | HST_RX | Serial data receive pin (used for firmware upgrade) |
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DMR858S : 5W Embedded DMR Tier II Walkie Talkie ModuleType: DMR Walkite Talkie
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Size (mm):59.1*24.1(motherboard) 37.6*24.2(PJ)
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DMR828S : 2W DMR Tier II Walkie Talkie Module With AMBE++Type: DMR Walkite Talkie
Certification: Others
Output Power: 500mW,2W
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