Duplex MMDVM Hotspot Board UHF VHF Buil-in Antenna Support P25 DMR YSF for Raspberry Pi Zero W 0W 2W 3B+ 4B 4B+
Direct purchase from the factory 
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Uchawana mari yakazara kana 100% kiredhiti yechitoro mushure mekunge tagamuchira pasuru yakadzoserwa uye tikaiona. Mari yacho ichagadziriswa uye yozopihwa otomatiki kune yako yekutanga nzira yekubhadhara.Ndapota cherechedza kuti mitengo yekutumira uye chero mitero kana mubhadharo haidzoserwe. Mari yekuwedzera yekutumira haidzoserwe kana pasuru yatotumirwa. Iwe une basa rekubhadhara aya mitero uye isu hatikwanise kuregerera kana kudzosera, kunyangwe odha ikadzoserwa kwatiri.Kana tangogamuchira uye tasimbisa chinhu chako chakadzoserwa, tichakutumira email kukuzivisa kuti tagamuchira chinhu chako chakadzoserwa. Tichakuzivisawo nezvekubvumidzwa kana kurambwa kwemari yako.Kana uine chero matambudziko maererano nemaitiro ekudzoserwa mari, ndapota taura nesu. service@roymall.com kana Whatsapp: +8619359849471Product Name: Duplex MMDVM Hotspot Board
Frequency Support: UHF 430-440MHZ, VHF 140-150MHz
Compatibility: Raspberry Pi Zero W, 2W, 3B+, 4B, 4B+
Modem Type: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO)
Onboard Antenna: Yes
This link is only for Mini Duplex MMDVM boardsSetting up Pi-star software and raspberry hardware (rpi 0-3) New pi4b needs to remove Right SocketPi-star general configuration for MMDVM_DUPLEXSet controller mode: duplex repeater or simpleRadio frequency: Freq: 144-148, 219-225, (main frequency band) 420-475, 842-950Duplex mode: Example: RX:438.000000 TX:433.000000Duplex mode: Example: RX:145.000000 TX:433.000000Simple mode: Example: RX:438.000000 TX:438.000000Radio/Modem Type: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO) or any other (GPIO board)Options: (not needed now, some older boards need to be set)Admin->Expert->Edit MMDVMHOST->RXOFFSET=0 TXOFFSET=0 (default value in pistar)(Update: 2019/2 new 3225 TCXO so 0ffset is 0 )Update new firmware: (pi-star/Expert/ssh access/user:pi-star pass:raspberry)sudo pistar-mmdvmhshatflash hs_dual_hatThe default bit error rate is less than 5%, and the default 0ffset is 0. If the bit error rate is greater than 5%, as long as the signal can be received, it can be corrected through 0ffset.
Features:
1. Versatile: This duplex MMDVM hotspot supports DMR, P-25, D-Star, and System Fusion, accommodating various radio communications preferences.
2. Raspberry Pi Compatible: The hotspot mounts cleanly on all current types of Raspberry Pi, inclusive of the Pi Zero W, 2W, 3B+, 4B, and 4B+, making it ideal for Raspberry Pi enthusiasts.
3. Dual Mode: The device supports both Duplex and Simplex modes, allowing for flexible communication sessions. In Duplex mode, it supports 2 time slots with simultaneous Tx and Rx.
4. No Ofset Required: With the best adjustment set at TX=0, RX=0, this device requires no ofset, simplifying the setup process for users.
5. Indicator LEDs: The board includes built-in LEDs that indicate status, along with status words on the shell for clear and straightforward device operation.
Package Includes:
1 x Duplex MMDVM Hotspot Board
