uSDX+

Description

The USDX+ is a very capable radio, perfect for those on a super tight budget.

USDX+ Features

– 8 bands cover 80m/60m/40m/30m/20m/17m/15m/10m
– Excellent PCB layout design in line with high-frequency circuit design principles to ensure excellent performance
– Whether using internal battery or external 13.8v power supply, it can reach 3-5W power in 8 bands, and reserve the SOT-223 and TO-220 package pads required for upgrading
– High emission efficiency, 80m/60m/40m/30m/20m efficiency is higher than 80%, 17m efficiency is higher than 70%, 15m/10m efficiency is higher than 60%
– High-precision KDS brand TCXO, frequency accuracy is better than 1PPM, frequency stability is better than 0.5PPM
– Ultra-small size: 83*38*124mm (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 op amp chip with lower noise than LM4562
– Built-in speaker with cavity
– Built-in 11.1v (12.6v) lithium battery
– BNC antenna interface

Functions:

– 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 Attenuators (ATT), TX noise gate, TX drive control, Volume control, dBm/S-meter
– SSB opposite side-band/carrier suppression 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)

Gallery

Specifications

Features

AGC / CAT / CW Decoder / DSP / Dual VFO / Noise Reduction / RF Attenuator / RIT / Signal Meter / Speaker / Split Operation / VOX

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