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Each Hotspot is tested for 24 hours before and ready to config when you get it.
There are a lot of info on YouTube about duplex hotspots, take a look this will help with setup and the advantage of duplex.
Built on a Pi 3 B
latest firmware from WSPD
2.24" OLED Screen
The default bit error rate is less than 5%, and the default offset is 0. If the bit error rate is more than 5%, as long as the signal can be received, it can be corrected by offset.
Pi-star General Configuration for MMDVM_DUPLEX
Set Controller Mode: Duplex Repeater or Simple
Radio Frequency: Freq:144-148,219-225,(Main Band)420-475,842-950
Duplex Mode: Example:RX:438.000000 TX:433.000000
Duplex Mode: Example:RX:145.000000 TX:433.000000
Setup On Duplex:RX:432.900000 TX:439.900000
Radio/Modem Type:STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO) or any other (GPIO board)
option don't need now, some old board need set)
Admin->Expert->Edit MMDVMHOST->RXOFFSET=0 TXOFFSET=0 (default value in pistar)
(update:2019/2 new 3225 TCXO so offset is 0 )