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"USDX Software Opensource:- https://github.com/threeme3/QCX-SSB/tree/feature-rx-improved\nSome Hardware Opensource Sites:- https://dl2man.de/- https://antrak.org.tr/blog/projeler/usdx-an-arduino-based-sdr-all-mode-hf-transceiver-pcb-iteration-v1-02/- https://www.qsl.net/py2ohh/trx/usdx/usdx.html\nGroup:- https://groups.io/g/ucx/topicsSchematic Diagram:- click downDownload:Firmware update method downloadhttps://cdn.shopifycdn.net/s/files/1/0660/9318/7237/files/89391-usDX_Radio_3-band_optimization_schematic.pdf?v=171982731Description:- This is a shortwave QRP SSB/CW transceiver. It boasts 1602 screen, built-in mic, built-in speaker! It can be connected to an automatic key, and can be decoded by CW.\nFeatures:- Using IRF series launch tube, durable- Can be used by connecting the antenna (BNC connector)- 3 bands. Power standing wave digital display!- Dimensions: 80 x 40 x 100mm- Provide ft8 option connector later- Aluminum shell laser marking\nFunction List:- Simple, interesting and versatile QRP SSB HF transceiver with embedded DSP and SDR functions.- EER E-level driven SSB launch stage.- 12V power supply provides about 5W Max PEP SSB output.- Full mode support: USB, LSB, CW, AM, FM.- DSP filter: 4000, 2500, 1700, 500, 200, 100, 50Hz passband.- DSP function: automatic gain control (AGC), noise reduction (NR), voice trigger, voice trigger Xmit (VOX), RX attenuator attenuator (ATT), TX noise gate, TX driver control, volume control, dBm/S-meter.- SSB reverse sideband/carrier suppression transmission: better than -45dBc, IMD3 (two tones) -33dBc, reception: better than -50dBc.- Multi-band support, continuously adjustable in the 160m-10m frequency band (and performance loss from 20kHz to 99MHz).- Open source firmware, built in for Arduino IDE; allows experimentation, can add new functions, can share contributions through Github, software complexity: 2000 lines of code.- Software-based VOX can be used as a fast full invasive (QSK and semi-QSK operation), or to assist in running in digital mode (without CAT or PTT interface) for RX/TX switching, external PTT output with TX/PA control-delay.- Simple installation modification with 8 component changes and 8 wires.- Lightweight, low-cost transceiver: Thanks to EER transmitter E-level, it has high power efficiency (no bulky heat sink required), and simple design (no need for complex balanced linear power amplifiers).- SSB transmitter stage based entirely on digital and software: By controlling the phase of the SI5351 PLL (via the tiny frequency change of I2C over 800kbit/s) and the amplitude of the PA (via the PWM of PWM) to sample the microphone input and reconstruct the SSB signal. PA key shaping circuit).- Fully digital and software-based SDR receiver stage (optional): sample the I/Q (complex) signal from the quadrature sampling detector digital mixer, and perform a 90-degree phase shift in the software (Hilber transform) and eliminate one by adding sidebands.- Three independent switchable analog front-end receiver attenuators (0dB, -13dB, -20dB, -33dB, -53dB, -60dB, -73dB).- Receiver noise level MDS: -135 dBm (200Hz BW) at 28MHz.- Receiver front-end selectivity: steep tuning frequency -45dB / ten times roll-off +/- 2kHz.- Blocking dynamic range: 20kHz offset 123dB, 2kHz offset 78dB.- CW decoder, straight/Iambic-A/B keyer.- VFO A/B + RIT and and Split, and switch the corresponding relay band filter through I2C.- CAT support (TS480 subset), you can stream audio, press keys, and display text through CAT.- This is probably the most cost-effective and easy to build standalone SDR/SSB transceiver. Great simplification Simplifies the original QCX circuit (that is, reduces the installation components by 50%, reduces the installation components by 50%, does not require complex transformer windings, and does not require alignment procedures), and is more versatile.\nPackage Included:- 1 x Transceiver- 1 x Handheld MicrophoneTest Video:\n"
<https://www.hgeek.com/ko/products/hamgeek-5w-usdx-sdr-qrp-transceiver-qcx-ssb-to-ssb-3-band-all-mode-hf-transceiver-with-handheld-microphone>