Usdx+ HF Shortwave Transceiver QRP SSB/CW Transceiver 3W-5W All Mode 8 Band Upgraded Version of usdx. This product has no built-in battery and no power source. It needs to be equipped by the user. The power interface is 5.5mm, the power supply voltage is 12.6V, 1A 2A can be used. The battery specification is 11.1V/12.6V 4000mAh lithium battery. This is a shortwave QRP SSB/CW transceiver. The ultra-small size is easy to carry for outdoor use, using 1602N LCD screen, built-in speaker, support to connect to PC, use digital mode software control such as FT8, JS8, FT4, etc. Support CW automatic decoding. 8 tracks cover 80m/60m/40m/30m/20m/17m/15m/10m. Excellent PCB layout design in line with high frequency circuit design principles to ensure excellent performance. Whether using internal battery or external 13.8v power supply, it can achieve 3-5w power in 8 ranges, and reserve SOT-223 and TO-220 pack pads needed to upgrade. High emission efficiency, 80m/60m/40m/30m/20m efficiency is greater than 80%, 17m efficiency is greater than 70%, 15m/10m efficiency is greater than 60%. High accuracy KDS brand TCXO, frequency accuracy is better than 1ppm, frequency stability is better than 0.5ppm. Ultra small size: 8338124mm (excluding protruding parts). Abundant interfaces (cat, ptt out, mic/key, k-head mic). All LPF parts use 100v c0g/np0 capacitors. Use genuine Omron original magnetic latching relays. Use op amp chip with lower noise than LM4562. Built-in speaker with cavity. BNC antenna interface. The usdx+ update is as follows. Moved the headphone and power key/microphone jacks to the front panel for easy access to the headphone and power button. Move the keys to the bottom of the LCD screen for a larger touch area and a more comfortable keystroke experience. Upgraded built-in speaker effects, double the sound! PCB reserved pads for various upgrades, out of the box, can be used as a template for DIY upgrade learning. Quickly change qrp cw frequency. Support cw sidetone volume adjustment. Support cw sidetone adjustment. Filter dsp filter: 4000, 2500, 1700, 500, 200, 100, 50hz passband. Function DSP functions: automatic gain control (AGC), noise reduction (NR), Xmit voice trigger (VOX), RX attenuator (ATT), TX noise gate, tx unit control, volume control, dbm/s meter. Sidebar/Carrier Suppression SSSSB transmit: better than -45dbc, imd3 (dual tone) -33dbc, receive: better than -50dbc. Support multi-band support, continuously adjustable 10m within 80m frequency range from 20khz.. Open source firmware, built with arduino ide; allows experimentation, new features can be added, contributions can be shared via github, software complexity: 2000 lines of software-based Vovox code available for fast full control (qsk and half-qsk operations) or rx/ Auxiliary switch tx for external control of ptt/pa output using fully digital tx-delay stage and software based ssb stage transmitter in digital mode (no cat or ptt interface required): controls the phase of the sill si5351 (by switching at 800kbits/s Small frequency changes under i2c) and magnitude of pa (via pwm pa key shaping circuit). Software-based all-digital SDR receiver stage (optional): The I/Q (complex) signal is sampled from a quadrature sampling detector digital mixer and a 90 degree phase shift is performed mathematically in software (Hilbert transform) and three independently switchable analog faders (0db, -13db, -20db, -33db, -53db, -60db, -73db) from the pre-receiver by adding Atten sidebands. Receiver noise floor mds: -135dbm at 28mhz (200hz bw). Receiver receiver front-end selectivity: +/-2khz steep 45db/decade tuning frequency rolling. Blocking blocking dynamic range: 20khz offset 123db, 2khz offset 78db. Cw decoder, direct/iambic-a/b keyer. Vvfo a/b + rit and split, and the corresponding relay through i2c. Cat supports cat with filter switch (using kenwood TS-480 protocol). Type: hf qrp sdr transceiver. Frequency range: 3.5-30mhz. 1 x usdx+ Transceiver. 4 x Machine Foot Pads. My goal is to make sure you are a happy customer and pleasant shopping with us. Usually, Parcel will be delivered. Sometimes shiping time may has a little delay, such as Bad wether, Holidays. We stand behind everything that we sell and will do everything possible to assure you are satisfied. Buyers are responsible for the postal cost of returning the items. 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