Fred, W6BSD in California loves to write helpful web pages for hams.
He has a wonderful site called BSDWORLD.ORG. There are many useful pages to explore there. I frequently refer to the North America CQZone 4 propagation image. Below it are links to over-views which show a snapshot of the actual activity hour-by-hour. If you click on the actual chart, you get an animated view of what’s happened in the last 24-hours. This is not a forecast but actual QSO data extracted from PSK reporter and other sources and updated every 15-minutes.
Fred has also written a couple of handy calculators about coaxial cables loses when the load is imperfect and a comparison graphs of coaxial cable losses for a multitude of cables.
These calculators can be found at the link at the very bottom of bsdworld.org at
0x9900.com
Links to the specific calculators are at:
Coax Cable Loss and the Impact of Bad SWR – 0x9900
Cable comparison tool – 0x9900
Below is an excellent tutorial video on SWR by W2AEW:
#208: Visualizing RF Standing Waves on Transmission Lines (youtube.com)
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