Basic Info.
Communication Distance
<8km
Product Description
SR_DMR_4WU
Two Way radio module/ walkie talkie module/FM radio module
Digital 4W / 400M - 470 M
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1. Summary
1.1Brief Introduction
Use digital intercom module with the DMR standard, support simplex voice, acknowledged / unacknowledged data SMS communication. This module internally installed high-powered RF transceiver chip, RF power amplifier, and DMR digital intercom chip. The external MCU can set the working parameter of the module by the standard asynchronous serial port communication and control the working state of the module. Only an external antenna, a microphone and a voice amplifier are needed for the module to form a complete DMR digital interphone.
1.2 Application Fields
Miniaturization digital interphone
Digital communication system of mobile phone
2. Characteristics
Frequency Range:400~470MHz
Frequency Space:12.5kHz
RF output power:high power 2W,low power 0.5W
Supply Voltage:4V
High Receiving Sensitivity:£-118dBm
Support writing-frequency
Support the DMR protocol and compatible with traditional analog intercom mode
The following businesses are supported under the mode of DMR
Support group calling, individual calling, general calls
Support acknowledged/unacknowledged SMS communication and status short message
Support calling/called detection
Support call alert
Support remote monitoring
Support emergency alarm
Support killing in a long distance/activating
Support voice and SMS application with shoot-through state and relay mode
The following businesses are supported under the mode of analog communication
Support CTCSS/CDCSS tone squelch
Support monitoring
3. Size and Pin arrangement
3.1 Module size
The module board as shown in Figure 1, and its size is 23.9mm×39.5mmx3.8mm. The definition of Pin as shown in table 1.
Fig 1 Module
3.2 Pin arrangement
Table 1The definition of module pin
Pin No. | Pin Name | Pin Category | Functional Description |
1 | SQ | Output | Receive state indication; Speaker output control enable 1: has signal received 0: no signal received |
2 | NC | | |
3 | AF_OUT | AO | Audio output |
4 | +3.3V | POWER | Module burn port(external test point or hang in the air) |
5 | PTT | DI | Module transmitter/receiver control enable. 1is receiver, 0 is transmitter. |
6 | PD | DI | Module workes enable 1: working: 0: sleeping |
7 | NC | | |
8 | VBAT | POWER | Power Supply ; DC 3.3-5V, recommend to be 4V |
9 | GND | GND | Ground |
10 | GND | GND | Ground |
11 | NC | | |
12 | ANT | | Connect the antenna |
13 | ARM-RST | DIO | Module burn(external test point or hang in the air) |
14 | SWDIO | DIO | Module burn(external test point or hang in the air) |
15 | SWCLK | DIO | Module burn(external test point or hang in the air) |
16 | RXD | DI | Asynchronous Serial Port(Receive Date) |
17 | TXD | DO | Asynchronous Serial Port(Send Date) |
18 | MIC_IN | AI | Audio output |
19 | GND | GND | Ground |
20 | GND | GND | Ground |
4. Typical Application Circuit Diagram And Principle Diagram
Typical application circuit block graph is shown as figure 2. The module can work by connecting with a main control MCU, audio amplifier and speaker, microphone. When working, you can write the serial command and configuration of the PTT pin to send and receive control by MCU. When the PTT pin is pulled low, the DMR module starts to transmit the signal.
Fig 2 Typical Application Circuit Block Graph
Appendix 5: default frequency list
For Type: D: digital A: analogy
For Type: D: digital A: analogy
No. | Type | Bandwidth (HZ) | Color code | Rx frequency (MHZ) | Tx frequency (MHZ) | Group | ID | Power | CTCSS CDCSS | Local ID |
1 | D | - | 1 | 403.125000 | 403.125000 | 1 | 1 | HI | - | 888 |
2 | D | - | 1 | 403.125000 | 403.125000 | 1 | 1 | HI | - | 888 |
3 | D | - | 1 | 403.125000 | 403.125000 | 1 | 1 | HI | - | 888 |
4 | D | - | 1 | 435.150000 | 435.150000 | 1 | 1 | HI | - | 888 |
5 | D | - | 1 | 450.075000 | 450.075000 | 1 | 1 | HI | - | 888 |
6 | D | - | 1 | 460.100000 | 460.100000 | 1 | 1 | HI | - | 888 |
7 | D | - | 1 | 469.175000 | 469.175000 | 1 | 1 | HI | - | 888 |
8 | D | - | 1 | 403.125000 | 435.125000 | 1 | 1 | HI | - | 888 |
9 | A | 12.5k | - | 435.150000 | 435.150000 | | | HI | carrier | |
10 | A | 12.5k | - | 469.175000 | 469.175000 | | | HI | carrier | |
11 | A | 12.5k | - | 412.000000 | 412.000000 | | | HI | carrier | |
12 | A | 12.5k | - | 418.000000 | 418.000000 | | | HI | carrier | |
13 | A | 25k | - | 420.000000 | 420.000000 | | | HI | carrier | |
14 | A | 25k | - | 425.000000 | 425.000000 | | | HI | carrier | |
15 | A | 25k | - | 430.000000 | 430.000000 | | | HI | carrier | |
16 | A | 25k | - | 430.000000 | 430.000000 | | | HI | carrier | |
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1) please contact us for complete spec. , serial communication protocol, and demo code,etc.
2) This package includes 1pcs module. The sample will be shipped by Singapore post or China Post Air Mail by default;
Address:
No. 623, Block B1, Huayuan Technology Innovation Park, #168 Baoyuan Rd, Baoan District, Shenzhen, Guangdong, China
Business Type:
Manufacturer/Factory
Business Range:
Consumer Electronics, Electrical & Electronics, Industrial Equipment & Components, Toys
Company Introduction:
We are design house. We focus on walkie talkie module/two way radio module design, produce, and sale;
1. Analog module: UHF (0.5W, 1W, 2W, 4W)
VHF (0.5W, 1W, 4W)
2. DMR digital module:
UHF(2W, 4W, 5W_full duplex)
3. Demo board of module;
4. Children Toy walkie talkie module;
5. We provide full technical support for both software and hardware;