CVARS WA7UHD

CVARS
The Chehalis Valley
Amateur Radio Society
WA7UHD
A 501(c)(3) Corporation

ARRL special service club




Electronics Workshop - April 25, 2019

Time & Location:

Topics:
  1. Hints & Hacks
  2. Tesla Coil
  3. Vertical Antennas

Notes:
Hints & Hacks:
  1. Mitchell's abrasive cords and tapes: diameters of 0.015", 0.018", 0.030" ... and grits of 200, 180, 150, 120.
  2. Bread clips can be used for labeling wire cables
  3. A hand cranked stepper motor charging a "supercapacitor" makes an emergency flash light without batteries

Reference:
Hints & Kinks:
  1. Mitchell's at:
    https://mitchellsabrasives.com/
  2. "Hand-cranked LED torch," by Julian Edgar, Practical Electronics, April 2019, pg. 76-77

Tesla Coil:
  1. Spark-gap Tesla coil construction: "Big TC," Charles Caringella, Popular Electronics, July 1964, pg. 29-32, 76;
    https://www.americanradiohistory.com/Archive-Poptronics/60s/64/Pop-1964-07.pdf
  2. Vacuum tube Tesla coil construction: "Li'l TC," Edwin N. Kaufman, Popular Electronics, July 1964, pg. 33-35;
    https://www.americanradiohistory.com/Archive-Poptronics/60s/64/Pop-1964-07.pdf
  3. 2nd vacuum tube Tesla coil construction: "Cigar-Box Tesla Coil," Tracy Diers, Popular Science, January 1946, pg. 190-194;
    http://www.serenitystreetnews.com/HERSTORY%20CRAMNOTES/5dterra%20NOTES%20AUDIO%20VIDEO/ebooks/ebooks/Cigar-Box%20Tesla%20Coil%20(Popular%20Science%20-%20January%201946).pdf
  4. Transistor Tesla coil kit:
    https://www.allelectronics.com/item/tcl-35/tesla-coil-kit/1.html

Vertical Antennas:
  1. CrankIR 80-2 meter portable vertical antenna:
    https://www.steppir.com/shop/vertical-antennas/crankir-40m-2m-vertical-antenna/
  2. Article comparing 1/4, 1/2 and 5/8 wavelength vertical antennas:
    http://www.pa3hcm.nl/?p=902


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