The 80M elevated wire vertical array

Written by admin On August - 26 - 2010 0 Comment

Here’s a great 80M antenna: a pair of raised 1/4-wave (68′) verticals in the pine woods, using Christman phasing, and capable of firing in either of two directions. Mine aim east and west.

A cheap 40M DX machine: the twin half-square array

Written by admin On August - 19 - 2010 1 Comment

This may be the cheapest, lowest, no-radials-required, no fancy networks, way to get great gain on 40M. If you have some rope, trees, junkbox wire, a couple of DPDT relays, and some coax laying around, you have all it takes to build this antenna.

Phased 40M Wire Verticals

Written by admin On August - 15 - 2010 5 Comments

Here’s a two-element array of wire verticals for 40M — read about using passive phasing, then Christman phasing. Includes a handy online calculator for phasing line lengths, and audio clips of the array in action.

Propagation Now

Time of latest WWV report Solar flux index -- from SWPC WWV.txt Day's sunspot count -- from SWPC dayind.txt Current A-index -- from SWPC curind.txt Curren K-index -- from SWPC curind.txt Geomagnetic condition based on current A-index and K-index levels GOES 14 Solar X-ray flux -- A or B is good, C M or X is not good Calculated band conditions based on +/- points awarded for latest: A-index, Aurora level, X-ray flux, Solar Flux Index, and typical utility of each band group during hours of daylight or darkness Latest OVATION-prime aurora forecast images K-index (3-hour readings from Boulder, CO) for the past 24 hours Solar Flux and Sunspots for the past 14 days Developed for the Orca DX and Contest Club by VA7ST
Use Control-F5 for latest image