Mini Duplex Hotspot Motherboard for MMDVM Digital Modem Box and 433MHz Antenna Support for DMR / D-Star / NXDN / POCSAG

Mini Duplex Hotspot Motherboard for MMDVM Digital Modem Box and 433MHz Antenna Support for DMR / D-Star / NXDN / POCSAG

Features:
- MMDVM simplex hotspot version, using imported crystals. Classic motherboard interface support: 2 x OLED screen interfaces, NXT serial port screen interface, SMA antenna base, IPEX antenna base, STLink firmware upgrade interface, support online upgrade, support DMR, D-Star, YSF (C4FM), P25, NXDN, POCSAG and other digital modes, on-board PCB antenna takes up small space. And it has stable signal, convenient DIY, LED light dual-line design display more clearly, support raspberry pie 1B 2B, 3B, 3B+, ZeroW.
- The mini board supports PCB antenna and two external antenna interfaces.

Parameter:
- Frequency: U band (420.000-434.900/438.100-470.00)
- Antenna central frequency point: 433MHz
- Supported mode: DMR, D-Star, YSF (C4FM), P25, NXDN, POCSAG
- Power: 20mW
- Size: 65 x 30mm
- Supported Raspberry Pi: 2B/3B/3B+/4B/ZeroW (The Raspberry Pi can be loaded directly, and the row header has been welded.)

The difference between Simplex and Duplex:
- Simplex can only work in direct frequency, just like the direct frequency intercom on the handset radio. Only one handset radio can talk to each other simultaneously.
- The duplex box can be like a relay station. The handset radio needs to set different frequencies for transmitting and receiving. The working principle of the duplex box is like a multi-mode digital relay station.
- The advantage of duplex box is to use DMR mode to talk at the same time without interfering with each other. One box can monitor two groups at the same time, and two groups can talk at the same time without interfering with each other. One duplex board is equivalent to two simplex boards. (Duplex board can also be set as simplex.)

Package Included:
- 1 x Mini Duplex Board
- 1 x Onboard Antenna