uSDX Transceiver

The uSDX transceiver is an enhanced and modified version of the Guido PE1NNZ open source project uSDX/QCX-SSB. This shortwave QRP SSB/CW transceiver is compact and portable, featuring two OLED displays for ease of use. Its integrated automatic antenna tuner unit is designed for QRP operations up to 10 watts.

Key Features:

• Compact Design: Lightweight and portable, making it easy to handle and use.
• 8 Bands Design: Covers 3.5MHz, 5.3MHz, 7MHz, 10MHz, 14MHz, 18MHz, 21MHz, and 29MHz.
• High Emission Efficiency: Over 85% efficiency for 3.5MHz, 5.3MHz, 7MHz, 10MHz, 14MHz; over 80% for 18MHz and 21MHz; and over 70% for 29MHz.
• PC Connectivity: Connects to a PC to use digital mode software like FT8, JS8, and FT4, with support for CW automatic decoding.
• Free Upgrades: Achieves 3-5W power across 8 bands, with options for PA module upgrades (TO-220).
• Stable Performance: Includes a highly precise TCXO for KDS, with frequency accuracy better than 1 PPM and frequency stability better than 0.5 PPM.
• Independent Design: Separate main board, radio frequency PA board, and ATU board to minimize internal signal interference.
• Selected Components: Utilizes 100V C0G/NP0 capacitors, with options for LM4562, LM833, or LT6231 op amps.
• Rich Interfaces: Equipped with HEADPHONE, PTT OUT, MIC/PTT, SPK/MIC, and BNC antenna interfaces (BCN-SL16 adapter included).

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 x 100 x 50 mm / 7.87 x 3.94 x 1.97 in
• Package Weight: 1200 g / 2.65 lb

uSDX_ATU System Functions:

• Supports full modes: USB, LSB, CW, AM, Frequency Modulation
• All-digital and software-based SDR receive and transmit channels
• Receive attenuator levels: 0dB, -13dB, -20dB, -33dB, -53dB, -60dB, -73dB
• DSP filter bandwidths: 4000, 2500, 1700, 500, 200, 100, and 50 Hz
• Receiving background noise: -135dBm at 28MHz (BW=200Hz)
• Receiver front-end selectivity: -45dB/decade roll-off ±2kHz
• SSB/Carrier suppression: transmit better than 45dBc, receive better than 50dBc
• DSP functions: AGC, Noise Reduction, VOX, RX Attenuator, TX Noise Gate, TX Drive Control, Volume Control, dBm/S meter

Three-Layer PCB:

• ATU-board
• PA-board: 8 band
• Mainboard

Rear Panel Connector (JACK):

• Headphone Jack (3.5 mm): Audio out (Tips, Rings), GND (Sleeve)
• MIC/PTT (Keys) Jack (3.5 mm): Mic input (Tips), PTT (Rings), GND (Sleeve)
• CW-KEYS INPUT MODE: DAH (Tips), DIT (Rings), GND (Sleeve)
• SPK/MIC Jack (3.5 mm): Speaker (Tips), MIC (Rings 1), PTT (Rings 2), GND (Sleeve)
• PTT OUT Jack (3.5 mm): SSR output (Tips, Rings), GND (Sleeve)

Packing List:

• Main Unit
• 13.5VDC Power Adapter
• BNC Adapter
• BNC Cable
• Handheld Microphone
• Wrench

Note:

Please note that the unit does not include a built-in battery or speaker. An external power supply is required.