The NiceRF SA818S is a cost-effective integrated professional walkie-talkie module using the RDA1846S chip with a built-in high-speed microcontroller, high-performance RF transceiver chip and RF power amplifier. It 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.
Users only need to connect an audio amplifier, microphone, and speaker to this module to work as a compact 1W RF transceiver or walkie-talkie covering the VHF or UHF bands. With the module’s simplified interface and ultra-small size, it can also be easily and quickly embedded in various handheld and mobile devices to provide a standalone UHF or VHF transceiver.
The SA818S strictly uses lead-free technology for production and testing, meets RoHS and Reach standards, and is CE-RED certified. The SA818S walkie-talkie module adds an LNA circuit based on the 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. The software and hardware interfaces are the same as before and are compatible with each other.
There are two versions of the SA818S covering the VHF and UHF frequency bands. The only difference is the frequency range. All other parameters are the same, including module size, interface, software protocol, etc. The two modules’ frequency ranges are:
SA818-CE VHF: VHF band 134 – 174MHz
SA818S-CE UHF: UHF band 400 – 480MHz
📋 SA818S Specifications
SA818S Internal Block Diagram
SA818S Pinout Definition
| Pin NO. | Pin name | I/O state |
| 1 | Audio ON | Connected to audio power amplifier. When the module worked, it can control the extra audio amplifier automatically, it will output low level to turn on the amplifier and high level to turn off the amplifier. |
| 2 | NC | Not connected |
| 3 | AF_OUT | Audio output |
| 4 | NC | Not connected |
| 5 | PTT | Module Input, Transmitting/receiving control, “0” force the module to enter TX state; and “1” to Rx state |
| 6 | PD | Power Down control, “0” for power down mode; “1” for the normal work |
| 7 | H/L | high/low output power control; Leave open for high output power，low level to low output power. (Please kindly note: this pin can NOT be connected to VDD or high level of cmos output) |
| 8 | VBAT | Connect power positive |
| 9 | GND | Grounding |
| 10 | GND | Grounding |
| 11 | NC | Not connected |
| 12 | ANT | connect 50 ohm antenna |
| 13,14,15 | NC | Not connected |
| 16 | RXD | RXD of the module and connect to external TXD *Before enter sleep mode, user need to pull low RXD Pin to prevent current leakage or poor reset in the next time. |
| 17 | TXD | TXD of the module and connect to external RXD |
| 18 | MIC_IN | Microphone or line in |
SA818S Mechanical Dimensions
🛒 Where to Buy the SA818S-CE RF Radio Transceiver Module
SA818S-CE UHF or VHF 1W Analog RF Radio Transceiver Module at Envistia Mall
📚 Additional Resources
SA818S Manufacturer’s Datasheet & Programming Manual
SA818S 1W Embedded walkie talkie module V1.3 (Click to view/download PDF)
SA818 Programming Manual (Click to view/download PDF)
Other SA818S Online References
SA818S-CE Product Page and Downloads on the G-NiceRF Website
Programming software for the SA818 radio module on Github
Using the SA818 Module as an Allstar Node Transceiver on hamvoip.org
Experimenting with SA818 miniature RF modules on OH2LAK Blog
Further experiments with SA818 transceiver modules – SVXLink simplex node on OH2LAK Blog
Cracking the SA818-V Radio Module on Wireless Billy
This user guide is provided by Envistia Mall. While every effort has been made to ensure accuracy, this document is provided "as is" without warranty of any kind. Envistia Mall is not responsible for any damage to equipment or injury resulting from the use of this information. Always follow proper safety precautions when working with electronic components. Product specifications and availability are subject to change without notice.