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3.46
Adjustment and alignment............................................................................................................................87
3.47
Installation in the optional QCX-mini enclosure............................................................................................94
3.48
QCX-mini GPS interface and PTT output........................................................................................................97
3.49
QCX-mini CAT port.........................................................................................................................................98
4.
Circuit design of the QCX-mini................................................................................................................100
4.1
Block diagram and summary.......................................................................................................................100
4.2
Circuit diagram............................................................................................................................................100
4.3
Synthesized oscillator..................................................................................................................................103
4.4
Transmit/Receive switch.............................................................................................................................104
4.5
Band Pass, Phase Splitter, QSD and pre-amps.............................................................................................105
4.6
90-degree audio phase shift........................................................................................................................106
4.7
CW filter......................................................................................................................................................107
4.8
Audio amplifier............................................................................................................................................108
4.9
Transmit signal routing and PA driver.........................................................................................................109
4.10
Class-E Power Amplifier...............................................................................................................................110
4.11
Low Pass Filter.............................................................................................................................................112
4.12
Key-shaping circuit......................................................................................................................................113
4.13
Microcontroller...........................................................................................................................................114
4.14
Optional GPS interface................................................................................................................................120
4.15
In Circuit Programming (ISP) interface........................................................................................................121
4.16
Test Equipment...........................................................................................................................................121
4.17
5V voltage regulator....................................................................................................................................124
5.
Fault-finding...........................................................................................................................................125
5.1
Blank LCD or blocked LCD............................................................................................................................125
5.2
No back-light at all.......................................................................................................................................125
5.3
A row of blocks appears on the top row......................................................................................................125
5.4
DC voltage readings.....................................................................................................................................125
5.5
RF Power output check................................................................................................................................128
6.
Measurements.......................................................................................................................................130
6.1
Equipment...................................................................................................................................................130
6.2
Transceiver current consumption................................................................................................................130
6.3
Transmitter power output...........................................................................................................................131
6.4
Class-E Power Amplifier drain waveform.....................................................................................................132
6.5
RF envelope key-shaping.............................................................................................................................132
6.6
Low Pass transmitter harmonic output filter characteristics.......................................................................133
6.7
Band Pass receiver input filter characteristics.............................................................................................133
6.8
Quadrature Sampling Detector bandwidth.................................................................................................137
6.9
CW Filter response......................................................................................................................................138
6.10
Unwanted sideband rejection.....................................................................................................................139
7.
Operation reference "cheat sheet"- Intentionally no Fr translation.......................................................140
8.
Resources...............................................................................................................................................141
9.
Document Revision History....................................................................................................................141
QCX-mini assembly Rev 1.05_Fr
3
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