DMR828 : 2W Walkie Talkie Module DMR module

DMR828 is a 2W long distance all-in-one Digital walkie talkie module. Only need external power supply and speaker, it is easy to become a professional digital walkie talkie. Simplified interface and Ultra small size make this module widely used in various applications and conveniently embedded into various handheld device.
Note:DMR828 has two vocoder versions:DMR828-NVOC & DMR828-AMBE.
DMR828 strictly uses lead-free process for production and testing, and meets RoHS and Reach standards.

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Parameters	Test condition	Min.	Typ.	Max.	Unit.
Voltage range		3.0	4.0	5.0	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			75		uA
Rx current			< 135		mA
Tx current （high power）	@VCC=5.0V,2W		< 1.1		A
Tx current （high power）	@VCC=4.0V,1.5W		< 950		mA
Tx current （low power）	@VCC=4.0V,27dBm		< 500		mA
Tx power（low power）	@VCC=4.0V		1.5		W
Tx power（low power）	@VCC=4.0V		500		mW
Mic input voltage			0.1	1.6	Vpp
Sensitivity			-124		dBm
Receiving BER(DMR modulation)	@ -121dBm		1		%
Audio output amplitude			2		V
Audio Output impedance			8		KOhm

Type	DMR walkie talkie
Output Power	2W

Features of Digital Walkie Talkie DMR828

UHF band frequency: 400~470 MHz
VHF band frequency: 134~174 MHz
350 band frequency: 320~400 MHz
Distance up to 5Km
Max power output to 2W, low power to 0.5W
High Sensitivity:-124dBm
Bit error rate down to 1% under -121dBm
Independent frequency for Tx and Rx
Analog Bandwidth: 12.5 / 25 KHz
Digital Bandwidth: 6.25KHz
Voice and text messages communication
Reminder for input calling, calling status checking
DMR /Analog walkie talkie
Message transmission and reception
Built-in EEPROM, data saved even powered off
1ppm TCXO crystal
51 CTCSS
166 CDCSS
9 adjustable volume
Enhanced encryption of Voice and Text message

Typical Application Circuit of Digital Walkie Talkie DMR828

Pins of Digital Walkie Talkie DMR828

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, Transmitting/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 8Ω 2W
12	SPKP	Audio output, connect to speaker 8Ω 2W
13,15,17,24	GND	Ground
14	SET	Configuration mode enable (low to enter into the setting mode, leave open or connect high level 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 and 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

Mechanical Dimensions of Digital Walkie Talkie DMR828