Create a Band Reject Filter using just Coax: Shorted Stub Version (049b)

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  • Опубликовано: 23 окт 2024
  • Let's build a Band Reject Filter using just coax!
    There are two ways to do this.
    In the first video I showed you how to do this with an OPEN stub. This was the easiest way.
    In this video, I will show you how to create a Band Reject Filter using a SHORTED stub.
    We can get some pretty amazing rejection with it!
    Admittedly, they are not not narrow band filters by any stretch of the imagination.
    Promised LINKS:
    --------------------
    Smith Chart - Downloadable FREE Complete Smith Chart
    www.scribd.com...
    SPEED OF LIGHT VALUES
    11802.85E6 inches/sec ... 11802.85 mega-inches/sec
    29979.24E6 cm/sec ... 29979.24 mega-cm/sec
    Time Markers for Your Convenience
    ----------------------------
    00:05 Introductory Comments
    01:38 How do they work?
    01:42 Single Stub
    03:48 Double Stub
    05:43 Designing One
    05:48 Know Your Materials
    06:42 Determine your Frequency (fo)
    06:52 Calculate Cable Lengths
    07:45 DEMO: 250 MHz Miscreant Signal
    08:12 Designing the Filter
    10:26 Cutting the Coax
    11:06 The Actual Build
    11:18 Creating the Shorts at the end of the Stubs
    12:02 Performance
    12:31 Tuning the Filter
    15:04 Adding Adjustability/Shortening the Stubs
    15:31 How?
    17:54 How to Design one
    18:23 Smith Chart Assumptions
    18:48 Two ways to approach the design ...
    19:36 DEMO: 90.9 MHz FM Broadcast Signal
    20:17 Some good advice ...
    20:48 DESIGN with WAY #1: Step-by-Step
    24:16 DESIGN with WAY #2: Step-by-Step
    28:17 Performance and Tuning
    29:51 Final Comments and Toodle-oots
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