Aluminum laser shell marking, all aluminum buttons, with translucent silicone buttons 4. The original qcx circuit is greatly simplified, and the installed components are reduced by 50%. Continuously adjustable in the 160m-10m frequency range (loss of 20khz performance).. 99mhz Open source firmware, built in ide; allows experimentation, can add new functions, can share contributions through github, software complexity: 2000 lines of code V-based software can be used for fast and complete rogue operations (qsk and semi-qsk), or auxiliary execution in digital mode (without cat or ptt interface) for rx/tx switch, with tx/pa delay control external ptt output -Simple installation and modification, 8 component changes and 8 lines Lightweight, low-cost transceiver: Thanks to the eer electronic liquid level transmitter, it has high power efficiency (no need for a huge heat sink) and simple design (no need for complex balanced linear power amplifiers) SSB transmitter phase is completely based on digital and software: control the phase of the si5351 PLL (through small i2c 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 transform) software in it and delete sidebands by adding Three switchable analog controllers independent of the front receiver 0db, -13db, -20db, -33db, -53db, -60db, and -73db Mds receiver noise level: -135dbm (200hz bw) 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 + rit and frequency division, and switch the corresponding relay with filter through i2c-Cat support (TS480 subset), which can be streamed through CAT transmission of audio, keystrokes and display text Interface Introduction: Charging: Built-in lithium battery charging port, only use the included charger!It is forbidden to use chargers by other producers Switch: off. Bat: built-in battery power supply. 13.8: external power supply DC13.8v/3a: External power interface Key: Automatic key body connection (a, b, single key) Pa: external power amplifier, ptt signal Mic: External microphone interface Uart: Serial communication (TS-480 compatible command) Spk: external speakers Package Included: 1 x Transceiver 1 x Power Adapter 1 x Mic. Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days.