CVARS WA7UHD

CVARS
The Chehalis Valley
Amateur Radio Society
WA7UHD

ARRL special service club




Electronics Workshop - June 29, 2017

Time & Location:

Topics:
  1. General Exam Antenna Questions (G9B)
  2. Re-purposing TV Antennas
  3. Ferrite Cores
  4. (Arduino) Frequency Meter

Notes:
  1. Lissajous frequency ratio: fY / fX = horizontal line crossings / vertical line crossings
  2. If pattern scrolls to left, input frequency is higher than trigger frequency;
    If pattern scrolls to right, input frequency is lower than trigger frequency.

Reference:
  1. General Exam Question Pool: http://ncvec.org/page.php?id=364
  2. “Recycling TV Antennas for 2-Meter Use”:
    http://www.arrl.org/files/file/Technology/tis/info/pdf/9611034.pdf
  3. Ferrite Cores: http://www.Palomar-Engineers.com/
    http://www.fair-rite.com/
  4. Lissajous Figures:
    https://www.electrical4u.com/lissajous-patterns-of-cro/
    http://www.electronixandmore.com/projects/scopepong/index.html

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