Description

uSDX Lite is optimized and modified based on the open source work: uSDX/QCX-SSB.

uSDX/QCX-SSB GitHub：

https://github.com/threeme3/usdx

Introduction:

This is a shortwave QRP SSB/CW transceiver. The ultra-small size is easy to carry for outdoor use. It uses a 0.91-inch OLED display and built-in speakers. It supports connecting to a PC and using digital mode software control such as FT8, JS8, and FT4. It supports CW automatic decoding.

Although named uSDX Lite this time, it is not a 8-band uSDX or uSDX+ that simply removes 3 bands. It has a more compact structure design, a more convenient interface design, and a perfect solution to OLED screens. caused by noise interference. So, it's a very useful 5-band HF-band QRP machine.

Features:

- 5 bands covering 80m/60m/40m/30m/20m.

- Excellent PCB layout design in line with high frequency circuit design principles to ensure excellent performance.

- The output power of the 5-band reaches 3-5W power, and the SOT-223 package pads required for the upgrade are

reserved.

- High transmission efficiency, all frequency bands are more than 75% efficient.

- High-precision KDS brand TCXO, the frequency accuracy is better than 1PPM, and the frequency stability is better than

0.5PPM.

- Ultra-small size: 82.8*28.8*114mm (excluding protruding parts).

- Abundant interfaces (CAT, PTT OUT, MIC/KEY, K-head microphone).

- All LPF parts use 100V C0G/NP0 capacitors.

- Use original genuine Omron magnetic latching relays.

- Use lower noise op amp chip than LM4562.

- Built-in speaker with cavity.

- BNC antenna interface.

List of features:

Simple, fun and versatile QRP SSB HF transceiver with embedded DSP and SDR functions;

EER Class-E driven SSB transmit-stage

Approximately 5W PEP SSB output from 13.8V supply

All-Mode support: USB, LSB, CW, AM, FM

DSP filters: 4000, 2500, 1700, 500, 200, 100, 50 Hz passband

DSP features: Automatic Gain Control (AGC), Noise-reduction (NR), Voice-triggered Xmit (VOX), RX Attentuators (ATT), TX

noise gate, TX drive control, Volume control, dBm/S-meter.

SSB opposite side-band/carrier supression Transmit: better than -45dBc, IMD3 (two-tone) -33dBc, Receive: better than -50dBc

Multiband support, continuously tunable through bands 160m-10m (and from 20kHz..99MHz with loss in performance)

Open source firmware, built with Arduino IDE; allows experimentation, new features can be added, contributions can be

shared via Github, software-complexity: 2000 lines of code

Software-based VOX that can be used as fast Full Break-In (QSK and semi-QSK operation) or assist in RX/TX switching for

operating digital modes (no CAT or PTT interface required), external PTT output/PA control with TX-delay

Simple to install modification with 8 component changes and 8 wires

Lightweight and low-cost transceiver design: because of the EER-transmitter class-E stage it is highly power-efficient (no bulky

heatsinks required), and has a simple design (no complex balanced linear power amplifier required)

Fully digital and software-based SSB transmit-stage: samples microphone-input and reconstruct a SSB-signal by controlling

the phase of the SI5351 PLL (through tiny frequency changes over 800kbits/s I2C) and the amplitude of the PA (through PWM

of the PA key-shaping circuit)

Fully digital and software-based SDR receiver-stages (optionally): samples I/Q (complex) signal from Quadrature Sampling

Detector digital mixer, and performs a 90-degree phase-shift mathematically in software (Hilbert-transform) and cancels out

one side-band by adding them

Three independent switchable analog front-end receiver attenuators (0dB, -13dB, -20dB, -33dB, -53dB, -60dB, -73dB)

Receiver Noise floor MDS: –135 dBm at 28MHz (in 200Hz BW)

Receiver Front-end selectivity: steep -45dB/decade roll-off +/-2kHz from tuned-frequency

Blocking dynamic range: 20kHz offset 123dB, 2kHz offset 78dB

CW decoder, Straight/Iambic-A/B keyer

VFO A/B + RIT and Split, and corresponding relay band-filter switching via I2C

CAT support (TS480 subset)

Note: if you need the user manual or more information, please feel free to contact our customer service.

Pacakge included:

1 x USDX-LITE

1 X Handheld Mic

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