CVARS WA7UHD  

   CVARS  –   WA7UHD
  The Chehalis Valley
 Amateur Radio Society
A  501(c)(3) Non-profit

     ARRL special service club
 
 

Electronics Workshop - August 27, 2020

Time & Location:

Topics:
  1. Sun Clock
  2. Grey Line Radio Propagation
  3. Ununs, Baluns, and Antenna Tuners

Notes:
Sun Clock:
  1. Sunclock is a Linux application which can be installed on many Linux systems with: "sudo apt-get install sunclock"
  2. Step-by-step instructions for installing sunclock on a RaspberryPi Sunclock are found at https://k4pyr.com/wp-content/uploads/2019/06/Raspberry-Pi-World-Sun-Clock-Project.pdf 
  3. A web site that displays a "Grey Line Map" refreshed every 5 minutes: https://dx.qsl.net/propagation/greyline.html 
Grey Line Radio Propagation:
  1. HF propagation:  https://www.electronics-notes.com/articles/antennas-propagation/ionospheric/hf-propagation-basics.php 
  2. Grey line propagation:  https://www.electronics-notes.com/articles/antennas-propagation/ionospheric/greyline-propagation.php 
Ununs, Baluns, and Antenna Tuners:
  1. An analysis of several baluns used by hams:  http://karinya.net/g3txq/baluns/baluns.pdf 
  2. Another balun discussion:  http://vk5ajl.com/projects/baluns.php 
  3.  https://sites.google.com/view/kn9b/guanella-current-balun 
  4. Looking at end-fed antennas and ununs:  https://www.kb6nu.com/playing-end-fed-wire-antennas-91-ununs/ 
  5. Balun/Unun Construction:  https://www.yccc.org/Articles/Antennas/N1IW/Balun_short_version.ppt 
  6. A discussion about antenna tuners:  http://karinya.net/g3txq/tuner_match/ 
  7. Toroid sources:
    • http://www.amidoncorp.com/ferrite-toroids/
    • https://www.universal-radio.com/catalog/misc/amidon.html
    • https://palomar-engineers.com/ferrite-products/ferrite-cores/
    • https://www.digikey.com/products/en/magnetics-transformer-inductor-components/ferrite-cores/936
    • https://www.mouser.com/Passive-Components/EMI-Filters-EMI-Suppression/Ferrites/_/N-bw7t4

Updated 08/24/2020.    Email webmaster.      Facebook Link