QRP Labs QDX, Assembly And Operating Manual

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6.12 Exit terminal....................................................................................................................................................100
7 Performance measurements....................................................................................................................................101
7.1 Receive current consumption............................................................................................................................101
7.2 Transmit current consumption..........................................................................................................................101
7.3 Power output vs supply voltage........................................................................................................................102
7.4 Output harmonic content..................................................................................................................................103
7.5 Unwanted sideband suppression......................................................................................................................104
8. Resources................................................................................................................................................................ 105
9. Document Revision History.....................................................................................................................................105
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.
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Four band 80, 40, 30 and 20m; 5 W from 9 – 10V supply
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Clean single signal output (zero residual carrier, zero unwanted sideband)
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Solid state PIN-diode switched Low Pass Filters and solid state Band Pass Filters
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Solid state transmit/receive switching
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High performance embedded-SDR SSB receiver using 110dB 24-bit stereo ADC chip
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Built-in USB sound card: 48ksps 24-bit stereo
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Built in USB Virtual COM port serial for CAT control
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Si5351A Synthesized local oscillator with better than 0.001Hz resolution and high precision
25MHz TCXO reference as standard
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Built-in signal generator
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Built-in suite of configuration and analysis tools
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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
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All SMD components pre-installed by factory, only through-hole component soldering by the
kit constructor
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Receive current: 100mA; Transmit current 1.0 – 1.1A (9V supply, 5W output)
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Only three connectors: USB (audio and serial for CAT), Power and RF
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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.
We hope you enjoy building and operating this kit! Please read this manual carefully, and follow
the instructions step by step in the recommended order. Later in the manual the circuit design is
described in detail and we recommend reading and understanding this section too, to get the
maximum enjoyment and education from your new radio.
Typical performance measurements are shown in the measurements section. The operation
section 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!
QDX assembly Rev 1.00
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