Amateur Extra Class Lesson 6.3, Filters and Impedance Matching

Posted on November 26, 2014 by

Here’s your video introduction to Section 6.3, Filters and Impedance Matching, in the ARRL Extra Class License Manual for Ham Radio.

After you’ve viewed the video, studied the section, and are comfortable with the associated test questions, you can return to the list of videos by clicking here.

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2 Responses to Amateur Extra Class Lesson 6.3, Filters and Impedance Matching

  1. Dave says:
    May 9, 2015 at 2:35 pm

    Hi Steve, bias is a DC voltage applied to the device that makes it act in a desired way. Usually the AC voltage acts very differently. This is why various RF circuit stages are often connected together via a capacitor, so that the AC passes but the DC is “blocked.” So the DC sets up the device, and the AC then uses it. I am thinking about a video series called “Ask KEØOG!” and think that would be a better venue to address your question. Sorry I can’t be more clear with just text. 73, Dave

  2. Steve Nash WB6ZJD says:
    May 3, 2015 at 2:11 pm

    Dave,
    I find your videos very helpful. Recently, I first studied the ARRL License Manual and then just barely passes the Extra exam. As I have been a commercial real estate appraiser for all of my professional career, I wanted a more thorough understanding of the electronic concepts than just the manual provided. Thus, I turned to your class which was recommended by several of my ham friends. Thanks so much for your help.

    My first question is regarding Bias. What is forward bias, reverse bias and where does the voltage come from?

    Sincerely, Steve WB6ZJD

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