2PCS SA818S-V 1W Output Power 30dBm 5km Distance VHF Band 134MHz to 174MHz Half-Duplex Walkie Talkie Transceiver Module 2pcs SA818S-V(134MHz~174MHz) modules SA818S is compatible with the old version SA818. If you need 400-480MHz frequency band, please leave a massage to confirm with us, otherwise, we will send 134-174MHz frequency band SA818S is a cost-effective integrated professional walkie-talkie module, built-in high-speed microcontroller, high-performance RF transceiver chip and RF power amplifier, and provides a standard serial port to communicate with the module, so that the relevant parameters of the module and the transceiver can be set quickly and easily. Function to 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 enable this module to be widely used, and it can also be easily and quickly embedded in various handheld devices to improve the overall performance of the terminal product. SA818S strictly uses lead-free technology for production and testing, and meets RoHS and Reach standards. SA818S walkie talkie module adds an LNA circuit on the basis of SA818, and the sensitivity is increased by 4dBm. For the entire frequency range of 400-470MHz, the power output fluctuation is less than 1dB, and the low power can achieve an error of 27dBm+/-1dBm from 400-470MHz. Note: The software and hardware interfaces are the same as before and are compatible with each other Features: UHF band frequency: 400~480 MHz VHF band frequency: 134~174 MHz 350 band frequency：320-400MHz (3 frequency bands are optional) Tx and Rx frequency, Tx and Rx CTCSS, CDCSS can be set alone. Band width: 12.5KHz / 25 KHz Output power up to 1W Distance up to 4-5km in open area Sensitivity：-124 dBm High-integrated, Small Size 38 CTCSS 166 CDCSS 8 level squelch 8 adjustable volume High/ low power is optional（500mW/1W） Wide range of working voltage: 3-5.5 V 1 ppm KDS TCXO crystal, Stable performance Application: Application of SA818S Walkie Talkie Module small walkie talkie Invisible intercom system audio surveillance system Outdoor Sport products Internal block diagram Specification Schematic Pinout: Machine Dimension: