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2. An alternating-current frequency of one cycle per second.
5. Signals from a transmitter or oscillator occurring on whole-number multiples of the desired operating frequency.
8. The number of complete cycles of an alternating current that occur per second.
10. A device that picks up or sends out radio frequency energy.
13. A device that converts sound waves into electrical energy.
14. An individual who acts as an advisor or mentor to a newly licensed amateur.
16. The basic unit of electrical current.
17. A thin metal strip mounted in a holder. When too much current passes through the fuse, the metal strip melts and opens the circuit.
18. A circuit that will allow some signals to pass through it but will greatly reduce the strength of others.

1. The stage in a receiver in which the modulation is recovered from the RF signal.
3. A stage of an FM receiver that makes the receiver less sensitive to amplitude variations and pulse noise.
4. Contraction for balanced to unbalanced. A device to couple a balanced load to an unbalanced source, or vice versa.
6. The process of varying an RF carrier in some way to add an information signal to be transmitted.
7. A device that converts chemical energy into electrical energy.
9. A region of electrically charged (ionized) gases high in the atmosphere. The ionosphere bends radio waves as they travel through it, returning them to Earth. Also see sky-wave propagation.
10. A test instrument that measures current.
11. A term used to describe several packet stations linked together to transmit data over long distances.
12. Continuous tone coded squelch system.
15. To vary the amplitude, frequency, or phase of a radio-frequency signal.