Jumbospot UHF VHF Antenna MMDVM jumbospot Hotspot OLED Board With Aluminum Case Support P25 DMR YSF For Pistar Raspberry Pii Antenna + Case + OLED + MMDVM hotspot board (not include raspberry pi ) Selling point : Our simplex systems all use an offset of 0, which is our duplex system. Regardless of simplex or duplex, the offset is 0. We are using high-precision temperature compensated crystals, so it is 0 We use high cost TCXO crystal with extremely low bit error rate, offset of 0, and frequency error of 0 new pi4b need remove R1 Resistor. STM32_MMDVM_HS HAT Rev1.7 Guide 1.Hardware add (SDA,SCL)R20,R21 Connect stm32 i2c 2 bus to OLED,and raspi. oled message pwr on without RPI using mmdvm_hs custom fw,and i2c 2 bus. 2.Support i2c communition with raspi Setting For Pi-star software and raspberry hardware (rpi 0-3) new pi4b need remove R1 Resistor. Controller Mode: Simplex Node Radio Frequency : Freq: 144-148 ,219-225, (Main Band)420-475 ,842-950 Example:438.000000 Radio/Modem Type: STM32-DVM(GPIO) 14.7456 TCXO with RXOFFSET=0 TXOFFSET=0 Quick start: 1.download image write it to card 2.insert card to rpi 3.wait to boot 5 minutes connect wifi Pi-star-setup pass raspberry 5.set freq ,dmr id ,dmr mode,add home's wifi ssid... Default Username: pi-star Default Password: raspberry to support i2c communication change MMDVM_HS code(by Andy Uribe CA6JAU)->Config.h // Host communication selection: //#define STM32_USART1_HOST //#define STM32_USB_HOST #define STM32_I2C_HOST to disable i2c 2 to raspi and oled just remove R20,R21 update new FW: (pi-star / expert / ssh access / user :pi-star pass:raspberry) sudo pistar-mmdvmhshatflash hs_hat ps:update new FW no oled pwr on message. 1.Latest version and the firmware is latest 2. original cystal : Original ECS-TXO-3225-147.4-TR from USA 3. With white on-board antenna Features: PLS note: the RXofffset is : -475(minus 475) Note: The product not include the raspberry pi. MMDVM hotspot for raspberry pi Can work with UHF or VHF If you have any problem with the hotpot module,please let us know,thanks Parameter: - High performance 32-bit - Fully assembled and tested - Supports DMR,P-25,D-Star and System Fusion - Onboard LEDs to show status (Tx,Rx,PTT,Mode) - Up to 10mW RF power - SMA antenna connector,UHF antenna included - Mounts cleanly on all current Raspberry Pi's including the Pi Zero - The firmware is pre-loaded and is easily upgraded via software. Please do not upgrade the firmware by yourself ,if you have not the knowledge for it. - Open source 3D printable case available - Support and tested with PI-STAR - UHF430-450MHz,433MHZ and 900MHz VHF 144 220 Opera FREQ Package List: - 1 x Black shell + antenna + OLED (not include the raspberry pi) We will send you the MDVM hotspot module (new version is can work with UHF or VHF) _x000D_