USDX Handheld Tri-Band Pocket Radio 15/20/40m 3 Band HF SSB QRP Transceiver NEW

  
USDX is a portable QRP amateur radio shortwave transceiver with a miniature SDR architecture, referring to the portable SDR model that redefines the appearance of uSDX. It can be used as an introductory FT8/CW/SSB learner, where the SSB reception quality is good and the transmission quality is slightly worse.

Please use a resonant antenna, because there is no protection in the machine, it is very easy to damage the power amplifier components. Due to the burn-in caused by improper operation, we donate vulnerable power amplifier components, and do not support the return of the whole machine, please understand! This kit is made of a small amount of modifications to the uSDX open source project. Since the original intention of the project design is derived from the simplified design concepts made by guido, DL2MAN, WB2CBA, etc.

There are still many things that need to be optimized and improved compared to the commercial machines on the market. If you use a telescopic antenna, it may not work well. It is recommended that you use a larger size standard antenna. If you have better optimization skills, you can also make further corrections or optimizations. This machine is optimized and modified according to the open source settings, and its performance and functions are fully compatible with the original design. More updated functions are subject to the actual use of the firmware version. If you have the skills, you can optimize it, and it is recommended to post your hardware and software update records in the open discussion group. Receiving: 0.5MHz 30MHz (theoretically it can reach the limit of SI5351). Power supply voltage: 10.5 16V DC, the negative pole is grounded. Body size: 502080mm (WHL) (excluding protrusions).

Weight: about 200g (main unit only). RF output power: 0.1-5W (SSB/CW). 1 is ground, 2 and 3 are signals.

Mic and key multiplexing port definition. In SSB mode, the function of this socket is microphone, 1 is ground, 2 is microphone (built-in microphone, here is external MIC), 3 is PTT control (panel integrated PTT control, button name is XMIT). In CW mode, it is the key interface. Please note that after switching back to SSB mode, the key can be used as PTT transmission control, and the MIC in the machine is invalid (the plug is inserted into the MIC in the machine and disconnected). The figure below shows the PTT control circuit.

The antenna interface is SMA, please connect a 50 ohm resonant antenna. Above the OLED screen socket in the machine, there is a 4P pad, and the square hole is the ground, which is defined as GND/TX/RX/DTR in turn. Please use TTL cable connection to flash the machine, and pay attention to swap RX and TX.

Under the fuselage, the plug size is 5.52.1, the inner core is positive, and the outer ring is negative. Do not plug it backwards, burn yourself out.

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