1. ABOUT UPDATE COMMAND: If the board does not work in full duplex mode, run the sudo pistar‑mmdvmhshatflash hs_dual_hat update command
2. HIGH PERFORMANCE: The duplex access point module has a 32-bit ARM processor with up to 10mW RF power, and each chip has been thoroughly tested
3. COMPATIBLE MODEL: Can be installed on current Pi, not compatible with 4. Compatible with P 25, D Star and System.
4. TECHNICAL PARAMETERS: The double hat access point module works on UHF 433-900 MHz and VHF 144-220 MHz. Modem selection when TX=0, RX=0: In the configuration, make sure the display type field at the top of the page is “Organic LED Type 3” and set the port to “Modem”. Also, in the “Expert” section, go to the host and scroll down to the “Organic LED” section. Make sure LogoScreensaver is set to 1. Otherwise the screen will go black when idle
5. EASY TO USE: The duplex access point module firmware is pre-installed and can be easily updated via software. Status of the integrated LED display (Tx, Rx, Mode)

Technical dataification:
Item Type: Duplex Access Point Module
Modem selection: For STM32_HS_GPIO
Frequency setting: TX, RX

Package list:
1 x Duplex Access Point Module
2*Antenna
2 x Pin Header