Duplex MMDVM Hotspot Board UHF VHF Buil-in Antenna Support P25 DMR YSF for Raspberry Pi Zero W 0W 2W 3B+ 4B 4B+

Specification Product Name Duplex MMDVM Hotspot BoardFrequency Support UHF 430 440MHZ VHF 140 150MHzCompatibility Raspberry Pi Zero W 2W 3B 4B 4B Modem Type STM32 DVM MMDVM HS Raspberry pi Hat GPIO Onboard Antenna YesThis 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 P