Practical Circuits (T7)

Overview

By this point you should have a basic understanding of the most common electrical components and what they do, this lesson will cover some of the common circuits those components are used to build. The circuits are of course the basic building blocks of radios, so you will also learn about those. Be prepared for another large chunk of vocabulary.

There are four topics covered by the questions in this lesson:

T7A – Station equipment: receivers, transceivers, transmitter amplifiers, receive amplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, PTT, modulation

T7B – Symptoms, causes, and cures of common transmitter and receiver problems: overload and overdrive, distortion, interference and consumer electronics, RF feedback

T7C – Antenna and transmission line measurements and troubleshooting: measuring SWR, effects of high SWR, causes of feed line failures; Basic coaxial cable characteristics; Use of dummy loads when testing

T7D – Using basic test instruments: voltmeter, ammeter, and ohmmeter; Soldering

Exam Insight

Question pool subelement: T7 (44 questions)

Questions in the exam: 4 (11.4% of the exam)

Assignment

• Read Pages 81 - 89 of “The No-Nonsense Guide”

• Study Flashcards in HamStudy.org for Questions T7