Circuits, Radio Signals, Modes & Equipment
Building on (and with!) the components and principles covered in the previous chapters, your studies now move to constructing and using the circuits that make up a radio. This set of resources will help explain how these circuits work and how they create the signals you hear on the air.
To help with the material in Chapters 6 and 7, download this review supplement on ac waveforms and measurements.
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Schematics and Circuit Diagrams
- How to Read Circuit Diagrams, Part I - this may be old, but it's accurate!
- How to Read Circuit Diagrams, Part II
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- Hands-On Radio - a series of tutorials that covers many simple circuits
- Load lines - additional graphical explanation of load lines
- Oscillators - the list of Electrical Oscillators covers the types you’ll encounter on the Extra exam
- Filters - a number of resources on filters of all types
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- Mixers - more information about frequency mixers and their operation
- Wikipedia entry on Modulation- a comprehensive review of modulation
- ARRL Technical Information Service - plenty of articles and links about AM
- Williamson Labs AM illustration page - animated page showing how AM works
- AMfone - a Web site about AM operating on the HF bands
- Williamson Labs SSB illustration - animated page showing how SSB works
- Wikipedia entry on Single Sideband - in-depth treatment with the theory
- Understanding FM Transmitters - a QST article about FM
- Williamson Labs FM illustration page - animated page showing how FM and PM work
- Wikipedia entry on Frequency Modulation - in-depth treatment with the theory
- Phase-Locked Loops - an overview of PLL operation
- PLL Tutorials - several detailed tutorials on PLL (advanced)
- Direct Digital Synthesis - an overview of DDS operation
- Amateur Fast-Scan TV - articles on ATV
- Amateur Slow-Scan TV - articles on SSTV
- AC Waveforms and Measurements Review
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- ARRL Digital Mode Information - information on most popular modes
- ARRL’s HF Digital Handbook - all about digital operating on the HF bands
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- ARRL TIS page on DSP - tutorials and applications on Digital Signal Processing
- Sampling - a more detailed treatment of the mechanics of sampling waveforms for processing
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- Oscilloscope tutorial - a graphical introduction to the oscilloscope
- Build Your Own Test Equipment - an ARRL publication that introduces projects for building your own test equipment
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- The ARRL Handbook - the Handbook has a good section on receiver performance
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- ARRL Technical Information Service (TIS) - numerous Web resources and magazine articles on technical topics of interest to all hams
- ARRL EMI/RFI Resources - a number of resources for managing interference of all types
- FCC Interference Handbook - the FCC’s guide to managing interference
- The ARRL RFI Book - helpful information for preventing and solving RF interference problems
Licensing, Education & Training >> Edu Dept Home >> Getting Licensed - Step by Step >> Studying for an Extra License copy >> Chapters 6, 7 & 8 - Circuits, Radio Signals & Modes and Equipment copy
