USOTA-ATU USDX HF QRP SDR Built-in ATU-100 Antenna Tuner

The uSDX is optimized and modified based on the Guido PE1NNZ open source project uSDX/QCX-SSB. The USDX is a shortwave QRP SSB/CW . With two OLED displays, it is compact in size and easy to carry. The automatic antenna tuner unit is adapted for QRP operation up to 10 watts.

Open source address: https://github.com/threeme3/QCX-SSB

Discussion group: https://groups.io/g/ucx/topics

Features:

Compact Size: It is compact in size, lightweight, portable and easy to use.

8 Bands Design: 3.5MHz; 5.3MHz; 7MHz; 10MHz; 14MHz; 18MHz; 21MHz; 29MHz.

Emission Efficiency: higher than 85% ( 3.5MHz; 5.3MHz; 7MHz; 10MHz; 14MHz); higher than 80% (18MHz and 21MHz); For 29MHz, it's over 70%.

PC Connection: Connected to a PC, using the FT8, JS8, FT4 and other digital mode software controls, supports CW automatic decoding.

Free Upgrade: It can reach 3-5W in 8 bands and can freely upgrade the PA module (TO-220).

Stable Performance: High precise TCXO for KDS, with frequency accuracy better than 1PPM and frequency stability better than 0.5PPM.

Independent Design: Independent core board, radio frequency PA board, and ATU board to avoids its own signal interference.

Selected Parts: All LPF parts use 100V C0G/NP0 capacitors, or use a LM4562 or LM833 or LT6231 op amp chip.

Rich Interfaces: There are HEADPHONE, PTT OUT, MIC/PTT, SPK/MIC BNC antenna interfaces (with BCN-SL16 adapter, easy matching antenna).

Specifications:

Name: 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

DSP 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

DSP functions: Automatic Gain Control (AGC), Noise Reduction (NR), Voice Triggered Xmit (VOX), RX Attenuator (ATT), TX Noise Gate, TX Drive Control, Volumes Control, dBm/S meter

Three-Layer :

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

Packing List:

1 * Main Unit

1 * 13.5VDC Adapter

1 * BNC Adapter

1 * BNC Cable

1 * Handheld Microphone

1 * Wrench

Note:

Note that there is no built-in battery or built-in speaker. External supplys is required.