SA818 Wireless Walkie Talkie Module UHF 400-480 MHz VHF 134-174MHz Audio Module

Buy SA818 Wireless Walkie Talkie Module UHF 400-480 MHz VHF 134-174MHz Audio Module

Introduction:

SA818 is a cost-effective integrated professional walkie-talkie module with built-in high-speed microcontroller, high-performance RF transceiver chip and RF power amplifier, and provides standard TTL serial port to communicate with the module, which can quickly and easily set the relevant parameters of the module and Transceiver function for control. Users only need to connect an audio amplifier, microphone, and speaker to this module to work as a small walkie-talkie. The simplified interface and ultra-small size make this module widely available, and can be easily and quickly embedded in various handheld devices to improve the overall performance of the terminal products.

Feature:

UHF band 400~480 MHZ

VHF band 134~174 MHZ

Transmit receive frequency independent

Bandwidth 12.5 KHz

Output power up to 1W

Open distance is 4-5 km

High receiving sensitivity: -124 dBm

Highly integrated small volume

38-level CTCSS analog sub-audio code

166-level positive phase, inverted CDCSS digital sub-audio

8-level squelch

8-level adjustable volume

High and low power options (500mW-1W)

Wide operating voltage 3.3-5.5 V

Built-in EEPROM, data power-down save

Stable with 1ppm TCXO crystal

Applications:

 

Small walkie talkie

Ignore the intercom system

Building community security system

Outdoor sports products

Audio monitoring system

Parameter	Test Conditions	MIN.	Typical	MAX.	UNIT
Operating voltage range		3.3	4.2	5.5	V
Operating temperature range		-30	25	70	℃
Current consumption
Sleep current			≤1		uA
Receiving current			60		mA
Emission current (high power)			650	750	mA
Emission current (low power)			450	550	mA
Emission frequency parameter
Operating frequency range	UHF	400		480	MHZ
Operating frequency range	VHF	134		174	MHZ
Transmit power (high power)	@VCC=4.0V	28	29.5	31	dBm
Transmit power (low power)		25	26.5	27	dBm
Modulation sensitivity	@1.5Khz/2.5KHZ frequency offset		10		mV
Audio modulation distortion	@1.5Khz/2.5KHZ frequency offset		2	5	%
Signal to noise ratio	@1.5Khz/2.5KHZ frequency offset	38	40	45	dB
Adjacent channel power	@12.5K offset		-60dBc		dBm
CTCSS modulation frequency offset		0.35	0.5	0.75	KHZ
Receiving radio frequency parameter
Receiving sensitivity	13dB output voice signal ratio		-124		dBm
Receive signal to noise ratio	@1.5KHZ frequency offset	45	50		dB
Audio output amplitude			700		mV
Audio output impedance			200		OHm

Pin number	Pin definition	Description
1	Audio ON	Audio power amplifier control, active low
2	NC	Empty foot
3	AF_OUT	Audio output
4	NC	Empty foot
5	PTT	Transmit/receive control pin, “0” is transmit; “1” is receive, default receive mode
6	PD	Module sleep enable, "0" or floating is dormant; "1" is normal operation
7	H/L	RF high and low power control; grounding is low power and floating is high power.
8	VBAT	Connected power supply
9	GND	Ground
10	GND	Ground
11	NC	Empty foot
12	ANT	RF input / output pin (connected to 50 ohm antenna)
13,14,15	NC	Empty foot
16	RXD	Serial port receiving data port
17	TXD	Serial port send data port
18	MIC_IN	Microphone signal input

Package includes:

1 x SA818 Wireless Walkie Talkie Module

SA818 Wireless Walkie Talkie Module UHF 400-480 MHz VHF 134-174MHz Audio Module Buy Now