Useful Link: SA818 Programming Manual.
Datasheet: SA818.
Specifications:
Features:
* Frequency range:
SA818-U: 400 ~ 480 MHz (UHF)
SA818-V : 134~174MHZ (VHF)
* Tx and Rx frequency, Tx andRxCTCSS,CDCSS can be set alone.
* Band width 12.5/25KHz
* Output power up to 1 w
* Transmission distance up to 3.5 to 5 kminOpen area
* sensitivity: - 124 DBM
* small size
* Built-in EEPROM, data kept unchanged even powered off
* 38 CTCSS
* 166 CDCSS
* 8 level squelch
* 8 adjustable volume
* high/ low power is optional (500 mw)-1w
* wide range of working voltage 3.3 to 5.5 V
* 1 ppm KDS TCXO crystal,
Application:
* small walkie talkie
* Invisible intercom system
* Sport products
* building community security system
* audio surveillance system