SA818 VHF High Frequency Wireless Walkie-Talkie Module Intercom

Product Description Item Overview: 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. Features: ● 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, reverse phase CDCSS digital sub-audio ● 8 levels of 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 ● 1ppm TCXO crystal oscillator, stable performance Technical Parameters: parameter Test Conditions Minimum typical maximum unit Operating voltage range 3.3 4.2 5.5 V working 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 Transmitting RF parameters 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 offset 10 mV Audio modulation distortion @1.5Khz/2.5KHZ offse 2 5 % Signal to noise ratio @1.5Khz/2.5KHZ offse 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 parameters 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 1 Audio ON 2 NC 3 AF_OUT 4 NC 5 PTT 6 PD 7 H/L 8 VBAT 9 GND 10 GND 11 NC 12 ANT 13,14,15 NC 16 RXD 17 TXD 18 MIC_IN Application: - Small walkie talkie - Ignore the intercom system - Building community security system - Outdoor sports products - Audio monitoring system If you want to buy UHF( 400~480 MHZ) ,click to buy them. Package Included: 1 x VHF Wireless Transceiver Module

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