1.1,"antennas and transmission lines - general"
1.2,"antennas and transmission lines - high-frequency antennas"
1.3,"antennas and transmission lines - vhf antennas"
1.4,"antennas and transmission lines - matching and tuning"
1.5,"antennas and transmission lines - towers and rotators"
1.6,"antennas and transmission lines - transmission lines"
2,"audio"
3,"commercial equipment"
4,"computer-aided design"
5,"construction techniques"
6,"digital techniques"
7,"features and fiction"
8,"filters"
9,"fm and repeaters"
10,"hazards"
11,"integrated circuits"
12,"keying and control"
13,"measurements and test equipment"
14,"microprocessors, computers and calculators"
15,"miscellaneous technical"
16,"novice reading"
17,"operating"
18,"oscillators"
19,"packet"
20,"power supplies"
21,"propagation"
22.1,"receivers and converters - general"
22.2,"receivers and converters - high-frequency receivers"
22.3,"receivers and converters - vhf receivers and converters"
22.4,"receivers and converters - test and troubleshooting"
23,"RTTY"
24,"satellites"
25,"semiconductors"
26,"single sideband"
27,"software"
28,"television"
29.1,"transmitters and power amplifiers - general"
29.2,"transmitters and power amplifiers - high-frequency transmitters"
29.3,"transmitters and power amplifiers - vhf and uhf transmitters"
29.4,"transmitters and power amplifiers - test and troubleshooting"
30,"troubleshooting"
31.1,"vhf and microwave - general"
31.2,"vhf and microwave - antennas"
31.3,"vhf and microwave - receivers and converters"
31.4,"vhf and microwave - transmitters"
31.5,"vhf and microwave - microwave techniques"
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