USDX HF QRP SDR Transceiver 8 Bands PC Connection Stable Performance Transceiver Specifications: Name: Transceiver Antenna Tuner Set Material: printed circuit board ATU (Automatic Antenna Tuner Unit): Maximum tuning inductance: 8.42µH Minimum tuning inductance: 0.05μH Maximum tuning capacitance: 1869pF Minimum tuning capacitance: 10pF Package size: 200 * 100 * 50mm / 7.87 * 3.94 * 1.97in Package weight: 1200g / 2.65lb uSDX_ATU System Functions: Full mode support: USB, LSB, CW, AM, Frequency Modulation All-digital and software-based software defined radio receive channels All-digital and software-based SSB transmit channels Receive attenuator: 0dB, -13dB, -20dB, -33dB, -53dB, -60dB, and 73dB Digital Signal Processor filter bandwidths: 4000, 2500, 1700, 500, 200, 100, and 50 Hz Receiving background noise: -135dBm at 28MHz (BW=200Hz) Receiver Front-End selectivity: Tuning frequency -45dB/decade roll-off ±2kHz SSB/carrier suppression: transmit, better than 45dBc; receive, better than 50dBc Digital Signal Processor functions: Automatic Gain Control (AGC), Noise Reduction (NR), Voice Triggered Xmit, RX Attenuator (ATT), TX Noise Gate, TX Drive Control, Volumes Control, dBm/S meter Three-Layer PCB: ATU-board PA-board: 8 band Mainboard Rear Panel Connector (JACK): 1. Headphone Jack (3.5 mm): Tips–Audio out Rings–Audio out Sleep–GND 2. MIC/PTT (Keys) Jack (3.5 mm): Tips–Mic input Rings–PTT Sleep–GND CW-KEYS INPUT MODE: Tips–DAH Rings–DIT Sleep–GND 3. SPK/MIC Jack (3.5 mm): Tips: SPEAKER Rings 1: MIC Rings 2: PTT SLEEVE: GND 4. PTT OUT Jack (3.5 mm): Tips–SSR output Rings–SSR output Sleep–GND