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2. Amateur radio - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio

   An example of an amateur radio station with four transceivers, amplifiers, and a computer for logging and for digital modes. On the wall are examples of various amateur radio awards, certificates, and reception report cards (QSL cards) from foreign amateur stations.

3. Q code - Wikipedia

   en.wikipedia.org/wiki/Q_code

   In amateur radio, the Q-codes were originally used in Morse code transmissions to shorten lengthy phrases and were followed by a Morse code question mark ( ) if the phrase was a question. Q-codes are commonly used in voice communications as shorthand nouns, verbs, and adjectives making up phrases.

4. R-S-T system - Wikipedia

   en.wikipedia.org/wiki/R-S-T_system

   The S stands for "Strength". Strength is an assessment of how powerful the received signal is at the receiving location. Although an accurate signal strength meter can determine a quantitative value for signal strength, in practice this portion of the RST code is a qualitative assessment, often made based on the S meter of the radio receiver at the location of signal reception.

5. QSK operation (full break-in) - Wikipedia

   en.wikipedia.org/wiki/QSK_operation_(full_break-in)

   QSK operation is a technical challenge: It requires very fast T/R RF switches at the high power and voltage side of the radio transceiver. Such switches must be controlled automatically by the telegraph key, and as such they must be rapid enough to be perceptually undetectable by the telegraph operator.

6. List of amateur radio modes - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio_modes

   Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.

7. General radiotelephone operator license - Wikipedia

   en.wikipedia.org/wiki/General_radiotelephone...

   Basic radio law and operating practice. Rules & Regulations – 6 questions; Communications Procedures – 6 questions; Equipment Operations – 6 questions; Other Equipment – 6 questions; Marine Radio Operator Permit question pool: 144 questions. To pass one must answer 18 of 24 questions (75%) correctly.