ULARI Transceiver VHF 7W Duo2 is based on NanoPi Duo2 512 MB module from FriendlyARM. The device consists of a microprocessor module and a motherboard with all necessary external components including VHF transceiver, hybrid power amplifier, 7-pole low-pass filter. The whole system includes::

• SMA VHF antenna connector,
• A 100 Mbit Ethernet connector with surge protectors,
• Two USB connectors with surge protectors, 5V/1A total current consumption (suitable for moderm LTE modems),
• Wifi chip with external antenna,
• RS-232 serial port (via 6-pin minidin connector),
• DS18B20 thermometer connector,
• Four leds informing about device operation,
• SD CARD connector for operating system image.

This device is a standalone VHF tranceiver. All you need to do is to connect a proper VHF antenna and you can send and receive RF signals from VHF band.

• Dimensions (without connectors): 100x94x32mm,
• Weight: 280g
• Housing material: aluminium, PCB panels,

• RX frequency: 136-174 MHz,
• TX frequency: 136-174 MHz,
• TX power: 3-7 W,
• Low-pass filter: 7-pole,

• VHF antenna connector: SMA female,
• Wifi connector: SMA female (antenna included),
• Power connector: round 5.5/2.1mm (with plus at center),
• Thermometer connector: terminal with screws,
• Serial port connector: minidin 6-pin female (1 serial port),

• Supply voltage: 12-14 VDC,
• Power consumption (at 12V): TO-BE-MEASURED

NanoPi Duo2 pinout diagram with with description of used pins.

RS-232 port can be used to connect any serial port devices with RS-232 voltage levels. Devices with low current consumption can also be powered from this connector. GPS-RS232/Microsat/2 is compatible and works nice.

• Pin 1 – 5V output, do not short-circuit, max. current 100mA,
• Pin 2 – GND,
• Pin 3 – hard-wired to negative voltage for WS-2300/WS-2350 weather station support,
• Pin 4 – RS-232 Port 2 TXD,
• Pin 5 – RS-232 Port 2 RXD,
• Pin 6 – not used.