SR-DMR-4WU

Digital 2way radio module Spec.

Half duplex /DMR 400M-470M

1 Summary

1.1 Brief Introduction

• Use the digital intercom module with the DMR standard, support simplex voice, acknowledged / unacknowledged data SMS communication. This module is internally installed with a high-powered RF transceiver chip, RF power amplifier, and a 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 inter-phone.

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 4W，low power 1W
• 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.

Notes:

• Please contact us for complete spec. , serial communication protocol, and demo code,etc.

• This package includes 1pcs module. The sample will be shipped by Singapore post or China Post Air Mail by default.