Practical picture
The antenna system is where circuit theory meets geography. A few dB saved in feed-line loss or gained in the useful direction can matter more than a much larger transmitter.
G9 · Antennas & Feed Lines
G9 Antennas & Feed Lines
The antenna system is where circuit theory meets geography. A few dB saved in feed-line loss or gained in the useful direction can matter more than a much larger transmitter.
General exam focus
4 questions on the General exam. Work through the question groups below to learn the ideas before using Quiz Me to check yourself.
Subelement G9
Antennas & Feed Lines
Each group below is a real teaching page, not just a topic list. Read the explanation, use the checklist to make sure the main ideas are sticking, then quiz that group if you want an immediate check.
G9A
Feed Lines, SWR & Matching
The feed line connects transmitter to antenna as an RF transmission system. Its characteristic impedance, loss, and mismatch determine how voltage and current vary along the line.
Study G9A →G9BDipoles & Monopoles
Dipoles and quarter-wave verticals are foundational antennas because they show the relationship among wavelength, feed-point impedance, polarization, and surroundings.
Study G9B →G9CDirectional Antennas
Directional arrays shape radiation by controlling relative current and phase in multiple elements. Gain comes from concentrating energy, not from creating power.
Study G9C →G9DSpecialized Antennas
Loops, multiband antennas, traps, log-periodics, and other designs trade size, bandwidth, pattern, and complexity to fit different operating needs.
Study G9D →Close the loop
Quiz Me on G9
After studying the groups, use the current public-domain question pool to see how the material is asked on the exam.
Exam scope: NCVEC 2023-2027 General Class (Element 3), effective July 1, 2023 through June 30, 2027, with February 4, 2026 sixth errata. The current NCVEC pool is the exam authority; explanatory prose here is SPARKA teaching material. NCVEC pool