SA818 Wireless Walkie Talkie Module UHF 400-480 MHz Audio Module

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ID: 1429963
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                    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
                    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 (this item) 400   480 MHZ
                    Operating frequency range VHF (ID:1441651) 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

                    SA818 Wireless Walkie Talkie Module UHF 400-480 MHz Audio Module

                    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




















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