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DMR828 2W High Power Wireless Digital Walkie Talkie Interphone Module 400-470 MHZ

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                  Introduction:
                   
                  DMR828 is a 2W long distance all-in-one DMR walkie talkie module. Only need external power supply and speaker, can be used as a small digital walkie-talkie with 16 frequency channels. Simplified interface and Ultra small size make this module widely used in various applications and conveniently embedded into various handheld device
                   
                  Feature:
                   
                  UHF band: 400~470 MHZ
                  Open distance is 8 kilometers
                  High power 2W, low power 0.5W
                  High receiving sensitivity: -124dBm
                  Error rate as low as 1% at -121dBm
                  Transmit receive frequency independent
                  Bandwidth 12.5 / 25 KHz
                  DMR (digital intercom) / analog intercom
                  Support SMS sending function
                  Built-in EEPROM, important data power-down save
                  Stable with 1ppm TCXO crystal
                  51-level CTCSS analog sub-audio code
                  166-level CDCSS digital sub-audio
                  9-level adjustable volume

                  Application:
                   
                  Small professional walkie talkie
                  Invisible intercom system 
                  Building community security system
                  Sport products
                  Handheld / Pocketable device
                  Audio surveillance system

                  Parameter Test Conditions MIN. Typical MAX. Unit
                  Operating voltage range   3 4 5 V
                  range of working temperature   -20 25 60 ℃
                  Operating frequency range   400   470 MHZ
                  Serial port baud rate     9600   bps
                  Current consumption
                  Sleep current     75   uA
                  Receiving current     < 135   mA
                  Emission current (high power) 　@VCC=5.0V,2W   < 1.1   A
                  Emission current (high power) @VCC=4.0V, 1.5W   < 950   mA
                  Emission current (low power) 　@VCC=4.0V,27dBm   < 500   mA
                  Transmit power (high power) @VCC=4.0V   1.5   W
                  Transmit power (low power)   500   mW
                  Mike input voltage     0.1 1.6 Vpp
                  Receiving sensitivity     -124   dBm
                  Receive error rate (DMR system) @ -121dBm   1   %
                  Audio output power     2   W
                  Audio output impedance     8   Ohm

                  Package includes:

                  1 x Module
                  1 x USB cable
                  1 x Speaker

                  Functions descriptions:
                   
                  DMR828 has default 16 channels, CH0~CH7 in DMR mode, CH8~CHF in analog mode. All the parameters can be configured by serial instructions.
                   
                  Parameter configuration:
                   
                  DMR828 Module offers standard serial port, users can configure and read the related parameters by sending serial instructions. Module has built-in memory, all configured parameters can be saved even power off. Meanwhile, we offer PC software to customers free of charge. DMR828 can be connected with computer via USB cable or UART interface, in this way, users can configure the parameters on PC software or their own device. The connection as shown in the figure below:

                  DMR828 2W High Power Wireless Digital Walkie Talkie Interphone Module 400-470 MHZ

                  DMR828 2W High Power Wireless Digital Walkie Talkie Interphone Module 400-470 MHZ

                  Pin NO. Pin Name Description
                  1 VCC Positive supply
                  2,4 GND Ground
                  3 CS Leave Open or high level for normal working, pull low to enter sleeping mode
                  5 PTT Module Input. Transinitting/receiving control, pull low to force the module to enter TX state: pull high for Rx state
                  6 LINE_OUT Audio output without amplified
                  7 8 16 Channels. Code 8421. 8th, default output "1"
                  8 4 16 Channels. Code 8421. 2th, default output "1"
                  9 2 16 Channels. Code 8421. 2nd, default output "1"
                  10 1 16 Channels. Code 8421. 1st, default output "1"
                  11 SPKN Audio output, connect to speaker 8ohm 2W
                  12 SPKP Audio output, connect to speaker 8ohm 2W
                  13,15,17,24 GND Ground
                  14 SET Configuration mode enable (low to enter into tlie setting mode, leave open or connect high leel to exit setting mode) 
                  Valid when CS Pin is high or leave open
                  16 MIC_IN Microphone or line in
                  18 UART-TX TXD of the module aad connect to external RXD
                  19 UART-RX RXD of the module and connect to external TXD
                  20 EZP_CS Reserved
                  21 SWCLK Reserved
                  22 SWDIO Reserved
                  23 ARM_RST Reserved

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