QCX assembly Rev 1.08
5
1. Introduction
Thank you for purchasing this high performance single-band 5W CW transceiver kit, the QCX (for
Q
RP Labs
C
W
X
cvr). This kit has a long list of features!
•
Easy to build, single-board design, 10 x 8cm, all controls are board-mounted
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Professional quality double-sided, through-hole plated, silk-screen printed PCB
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Choice of single band, 80, 60, 40, 30, 20 or 17m
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Approximately 3-5W CW output (depending on supply voltage)
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7-16V recommended supply voltage
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Class E power amplifier, transistors run cool… even with no heatsinks
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7-element Low Pass Filter ensures regulatory compliance
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CW envelope shaping removes key clicks
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High performance receiver with at least 50dB of unwanted sideband cancellation
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200Hz CW filter with no ringing
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Si5351A Synthesized VFO with rotary encoder tuning
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16 x 2 blue backlight LCD screen
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Iambic keyer or straight key option included in the firmware
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Simple Digital Signal Processing assisted CW decoder, displayed real-time on-screen
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On-screen S-meter
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Full or semi QSK operation using fast solid-state transmit/receive switching
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Frequency presets, VFO A/B Split operation, RIT, configurable CW Offset
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Configurable sidetone frequency and volume
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Connectors: Power, 3.5mm keyer jack, 3.5mm stereo earphone jack, BNC RF output
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Onboard microswitch can be used as a simple straight Morse key
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Built-in test signal generator and alignment tools to complete simple set-up adjustments
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Built-in test equipment: voltmeter, RF power meter, frequency counter, signal generator
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Beacon mode, supporting automatic CW or WSPR operation
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GPS interface for reference frequency calibration and time-keeping (for WSPR beacon)
No test equipment is required to build, align and operate this CW transceiver. Its innovative self-
alignment and self-test features will help and guide you in setting up the transceiver in a few easy
steps. The kit also includes a voltmeter, RF power meter, frequency counter and signal generator
which can aid in debugging and fault-finding.
We hope you enjoy building and operating this kit! Please read this assembly 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 of the manual describes transceiver, alignment and test equipment operation in detail.
There is a single page reference “cheat sheet” near the end of the manual.
Summary of Contents for QCX 5W CW
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