Function List: Eer e-level drives the ssb mitting stage. 13.8v power supply about 10w ssb pep output. Support full modes: usb, lsb, cw, am and fm-. Filter: 4000, 2500, 1700, 500, 200, 100, 50hz passband. function: automatic gain control (agc), noise reduction (), voice trigger, voice trigger xmit, attenuator rx (att), tx noise gate, tx drive control, volume control, and dbm/s-meter Ssb reverse sideband/carrier suppression mission: -45dbc, imd3 (dual tone) -33dbc; reception: -50dbc. Support multi-band. Continuously adjustable in the 160m-10m frequency range (loss of 20khz performance)..99mhz. Open source firmware, built in ide; allows experimentation, can add functions, can share contributions through github, software complexity: 2000 lines of code SSB mitter phase is completely based on digital and software: control the phase of the si5351 PLL (through small frequency changes over 800kbit/s) and the amplitude of the PA (through pwm to pwm) to test the microphone input and reconstruct the SSB signal. Key shaping circuit PA). All-digital and software-based SDR receiver stage (optional): I/Q signal (complex) is sampled from the quadrature sampling detector digital mixer, and perform 90 degree phase shift (Hilber form) software in it and delete sidebands by adding. Three switchable analog controllers of the front receiver. 0db, -13db, -20db, -33db, -53db, -60db, and -73db. Mds receiver noise level: -135dbm (200hz ) at 28mhz Pre-receiver selectivity: steep frequency adjustment -45db/ ten times roll-off +/- 2khz. Blocking dynamic range: 20khz offset 123db, 2khz offset 78db. CW decoder, direct/iambic-a/b keying-Vfo a/b + and frequency division, and switch the corresponding relay with filter through -Cat support (TS480 subset), which can be streamed through CAT mission of audio, keystrokes and display text Description: USDR/uSDX is a pocket-sized 8-band SSB/CW QRP ceiver. Designed with built-in lithium battery,