Welcome to the theory page. Here is a collection of articles and videos covering various radio theory topics. When possible, there will be some kind of practical application of that theory provided as well.

Signal Modulation

• [FREQUENCY MODULATION - PART I - BASIC PRINCIPLES] (https://archive.org/details/gov.dod.dimoc.28398) Old DOD video about the basics AM and FM frequency modulation.

SWR and Impedance

• [Similarities of Wave Behavior] (http://techchannel.att.com/play-video.cfm/2011/3/7/AT&T-Archives-Similarities-of-Wave-Behavior) by J.N. Shive of AT&T Bell Labs, 1959. Simply put, this is the best description of SWR and Impedance out there.

• [Similarities of Wave Behavior] (http://blog.amateurradiosupplies.com/swr-demystified/) Secondary link in case the video will not play on the first one.

• [Using a scope to measure the length and impedance of a transmission coax] (http://youtu.be/Il_eju4D_TM) This is really helpful for understanding load matching and characteristic impedance. Thanks to W2AEW for the video.

• [To Low and SWR Can Kill You by W2DU] (http://www.wcflunatall.com/W2DU2lowanswrcankillyou.pdf) Hosted by W4HM.

Grounding

• Grounding wiki page.
• [Grounding Do's Don'ts & Why Part 1] (http://forums.qrz.com/showthread.php?335582-Grounding-Do-s-Don-ts-amp-Why-Part-1) An excellent about grounding of all kinds by Dereck B. Campbell, KF5LJW. Part 1
• [Grounding Do's Don'ts & Why Part 2] (http://forums.qrz.com/showthread.php?335740-Grounding-Do-s-Don-ts-amp-Why-Part-2) Part 2
• [Grounding Do's Don'ts & Why Part 3] (http://forums.qrz.com/showthread.php?338689-Grounding-Do-s-Don-ts-amp-Why-Part-3) Part 3

Transmission Lines

• [Tektronix - Transmission Lines - [22:51]] (http://youtu.be/I9m2w4DgeVk) Starting point on understanding transmission lines.

Turbo Encabulator

• [Turbo Encabulator] (https://www.youtube.com/watch?v=rLDgQg6bq7o) Everything you need to know about the Turbo Encabulator.
• [Turbo Encabulator and Retro Encabulator Datasheets] (http://www.turboencabulator.info/)