1. Introduction
The QDX is a high performance, four-band 5W Digital modes transceiver with CAT control and
built-in USB sound card. QRP Labs presents QDX, a digital transceiver with a ratio of performance
to price not available until now.
• Four band 80, 40, 30 and 20m; 5 W from 9 – 10V supply
• Clean single signal output (zero residual carrier, zero unwanted sideband)
• Solid state PIN-diode switched Low Pass Filters and solid state Band Pass Filters
• Solid state transmit/receive switching
• High performance embedded-SDR SSB receiver using 110dB 24-bit stereo ADC chip
• Built-in USB sound card: 48ksps 24-bit stereo
• Built in USB Virtual COM port serial for CAT control
• Si5351A Synthesized local oscillator with better than 0.001Hz resolution and high precision
25MHz TCXO reference as standard
• Built-in signal generator
• Built-in suite of configuration and analysis tools
• Lifetime free firmware upgrades with QRP Labs Firmware Update (QFU) bootloader for
easy firmware update on any OS with no extra software, or drivers, or programming
hardware
• All SMD components pre-installed by factory, only through-hole component soldering by the
kit constructor
• Receive current: 100mA; Transmit current 1.0 – 1.1A (9V supply, 5W output)
• Only three connectors: USB (audio and serial for CAT), Power and RF
• Optional smart aluminium extruded enclosure measuring just 89 x 63 x 25mm
No test equipment is required to build, align and operate this digi modes transceiver. There are no
alignment tasks.
Assembly of the transceiver is covered in a separate document, along with design details
(theoretical explanation) and performance measurements.
This document describes operation of QDX, and applies to the firmware version specified. This
manual will get you started with QDX and your WSJT-X or other digi modes software in minutes.
PLEASE READ THE BASIC ASSEMBLY AND USE INSTRUCTIONS IN
THIS MANUAL VERY CAREFULLY BEFORE APPLYING POWER TO
THE BOARD!
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