lørdag den 5. januar 2019

uBITX 10 W SSB-transceiver for 10-80 m

I've just acquired an uBITX. It is a 10 W SSB-transceiver operating from 10 meters down to 80 meters. The uBITX is made in India. The transceiver is not a kit - it is delivered as two assembled PCBs, an LCD-display, and wires.

The main board is the transceiver module and the smaller PCB contains the VFO. The user's task is to mount the circuit boards into an enclosure and fit terminals and controls.

The uBITX block diagram.

The block diagram above shows the RX-part which is a superheterodyn receiver with two IF stages at 45 MHz and 12 MHz. The TX-part is the same concept, but the transmit signal flows "backwards".

Main board and two digital PCBs mounted vertically. 

The main circuit board measures 15 cm x 14 cm and contains most of the components. There are no adjustments to make as they are set at the factory.

The VFO comprises an Arduino Nano and a programable oscillator Si5351. The oscillator frequencies are set with an encoder, and the operating frequency is displayed on an LCD. The factory delivered display is a 2 x 16 LCD; however, a larger color touch display can be added.

I found a cabinet at amateurradiokits.in. It has all holes punched and makes the transceiver look "factory made".

Support group for uBITX: groups.io/g/BITX20
Facebook group for uBITX: fb.com/groups/uBITX/

Vy 73 from OZ1BXM Lars
Homepage: oz1bxm.dk

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