DMR858S : 5W Embedded DMR Tier II Walkie Talkie Module

DMR858S : 5W Embedded DMR Tier II Walkie Talkie Module

DMR858S is an ALL-IN-ONE DMR 5W professional walkie talkie module. It combined analog and DMR Tier II walkie talkie function. This product is compatible with DMR radio with Moto AMBE++ and all the analog walkie talkie in the market. DMR858S is easy to use , which embedded DSP processor , DMR encoder/decoder, RF / Audio Amplifier , PTT, Microphone, 16 Channel switch, Volume adjustment all on board. Just connected with power supply and speaker, it build a 5W professional DMR walkie talkie. DMR858S has long range and good voice quality. Special heat sinks are designed specially to guarantee long time talking.
The digital intercom supports the following functions in DMR mode:
SMS sending function, support pass-through and SMS application;
Voice encryption function, SMS encryption function;
Calling and called prompts.

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Parameters	Condition		Min	Typ	Max	Unit
Power Supply			3.6	4.0	8.4	V
Working temperature			-20	25	60	℃
Frequency Range	@UHF		400		470	MHz
	@VHF		134		174	MHz
	@350		320		400	MHz
Serial baud rate				57600		bps
Current Consumption
Sleep current	@CS pulled low for 3 seconds			1		mA
RX Current				170		mA
TX current (High power)-DMR	@VCC=4.0V,2w			650		mA
TX current (High power)-DMR	@VCC=8V,5w			1000		mA
TX current (Low power)-DMR	@VCC=4.0V,0.5w			400		mA
TX current (Low power)-DMR	@VCC=8.0V,1w			460		mA
TX current (High power)-Analog	@VCC=4.0V,2w			1200		mA
TX current (High power)-Analog	@VCC=8V,5w			1600		mA
TX current (Low power)-Analog	@VCC=4.0V,0.5w			700		mA
TX current (Low power)-Analog	@VCC=8V,1w			800		mA
Analog Rx Parameters
Rx sensitivity (Analog)	@12dB SINAD			-120		dBm
S/N	@1.5K deviation			40		dB
Adjacent channel selectivity	12.5KHz offset			62		dB
Inter modulation Rejection	12.5KHz offset			63		dB
Blocking immunity	Interference frequency interval >1M			88		dB
Audio amplitude(line out)	F0=1KHz		0.2	130	460	mV
Output impedance of audio(SPK)				8		Ohm
Audio distortion	F0=1KHz				5	%
Audio response	300Hz			8		dB
	500Hz			6
	1KHz			0
	2KHz			-6
	3KHz			-12
DMR Rx Parameters
BER（DMR Mode）		@ -117dBm		4		%
Adjacent channel selectivity（ACS)		Offset:+12.5KHz	60			dB
Adjacent channel selectivity（ACS)		Offset:-12.5KHz	60			dB
Inter modulation Rejection		Offset:+50/100KHz	63			dB
Inter modulation Rejection		Offset:-50/100KHz	63			dB
Blocking immunity		Offset:+/-1MHz	87			dB
Blocking immunity		Offset:+/-5MHz	87			dB
Analog Tx Parameters
Max Freq deviation		12.5KHz deviation（N）		2.2	2.5	KHz
Max Freq deviation		25KHz deviation（W）		4.5	5	KHz
Sensitivity		deviation: 1.5KHz/2.5KHz	4	7	10	mV
Audio distortion		deviation: 1.5KHz/2.5KHz		1	5	%
Modulation characteristic		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 deviation			350	400	600	Hz
Output power of adjacent channel		12.5KHz offset	-60	-63		dBc
SNA		1.5KHZ/2.5KHz	38	40	50	dB
DMR Tx parameters
Frequency error				0.5		ppm
4FSK Tx BER					≤1×10-4
Output power of adjacent channel		+/-12.5KHz			≤-55	dB
Output power of next adjacent channel		+/-25KHz			≤ -65	dB

Type	DMR walkie talkie
Output Power	5W

Features of DMR Walkie Talkie Module DMR858S

UHF band frequency：400~470 MHz
VHF band frequency：134~174MHz
350 band frequency：320-400MHz (3 frequency bands are optional)
6~8 Km in open area
Max power output to 5W Low power to 1W
Sensitivity up to：-120dBm
Less than 2% BER @ -117dBm
TX/RX frequency set separately
Bandwidth for analog:12.5 / 25 KHz Bandwidth for DMR:6.25KHz
DMR / Analog walkie talkie
SMS transmission and reception
Built-in EEPROM, data saved even powered off
Low power consumption in sleep mode
DMR Tier II
Tail sound elimination automatically
Embedded design for handheld product

Application of DMR Walkie Talkie Module DMR858S

Typical application circuit of DMR Walkie Talkie Module DMR858S

DMR858S Functional Board

Functional Board of Walkie Talkie Module DMR858S

Pin No	Definition	I/O	Description
1,2,4	GND		Ground
3	MIC_IN	I	Microphone input
5	UART-RX	I	Connected with UART-TX of external device
6	UART-TX	O	Connected with UART-RX of external device
7,13	GND		Ground
8	CS	I	Sleep: 0 ; working: 1 (high level or leave open)
9	PTT	I	TX: 0, RX: 1
10	LINE_OUT	O	Line out for voice
11	T/R	O	TX/RX indicator, 1: TX , 0: RX
12	SPKEN	O	Valid signal indicator, 1: signal valid, 0: No valid signal received. This pin can be used to drive ecternal voice amplifier. 1: on, 0:off
14,15	+3.3 V		3.3V output，maximum 50mA loading
16,17,18,19	+VCC		VCC (3.3V-9V)
20	GND		Ground

DMR858S-PJ (Control Board )

Control Board of Walkie Talkie Module DMR858S-PJ

Pin No.	Definition	I/O	Description
1	VCC		VDD (connected to Pin 19 of function board)
2,4	GND		Ground
3	CS	I	Connect to CS of the function board
5	PTT	I	Connect to PTT of the function board
6	LINE_OUT	O	Connect to Line Out of the function board
7	8	I	Frequency channel selection,( 16 channels ), The frequency channlel can be selected either by the onboard rotary switch or these pads input. Turn to channel 0 or remove the rotary switch if user want to control the channel with these pads.



		I	8 :the maximum bit,
		I	4: the 3rd bit,
		I	2: the 2nd bit;
		I	1: the least bit for example :
		I	8421 encoding:
		I	0000: channel 0,
		I	0001: channel 1
		I	0010: channel 2
8	4	I	0011 :channel 3
9	2	I	…
10	1	I	1111 : channel 15
11	SPKN	o	Connected with Speaker: 8 Ohm 2W
12	SPKP	o	Connected with Speaker: 8 Ohm 2W
13,15,17	GND		Ground
14	SET	I	Setting mode (0: setting mode , 1: normal mode )
16	MIC_IN	I	Connect to Mic_IN of the function board
18	TXD	O	Connect to TXD/RXD of the function board
19	RXD	T	Connect to TXD/RXD of the function board
20	+3.3V		3.3V output，maximum 50mA loading
21	SPKEN		Connect to SPKEN of the function board
22	NC		NC
23	H/L	I	Output power control, 0: low, 1: high
24	GND		Ground

Mechanical Dimensions of DMR Walkie Talkie Module DMR858S

DMR858S : 5W Embedded DMR Tier II Walkie Talkie Module

Features of DMR Walkie Talkie Module DMR858S

Application of DMR Walkie Talkie Module DMR858S

DMR858S Functional Board

DMR858S-PJ (Control Board )

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