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Gain the on-air edge: This article explains how the ANTENNA is the key! -> Read this introduction to Antenna Modeling


How-To Articles:

- Is HF Propagation Reciprocal?
- De-mystifying HF Radio Propagation and Modeling

Check out the ACE-HF propagation software - the latest is version 2.05. ACE-HF is propagation forecasting and modeling for Amateur Radio as well as for Shortwave radio Listening and general HF operation. This software is even used by the military and other clients around the world. This software is developed and maintained by the same engineers that keep VOACAP up-to-date. As a result, this software is the most accurate user interface integrated with VOACAP. CHECK IT OUT, TODAY. This software is the most accurate modeling software available, and is endorsed by NW7US. Read the details to find out why.




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This page was rendered on 25-Apr-17 0838 UTC.

Sun Spots: 41 as of 04/24/2017 :: Flux: 80 | Ap: 20 | Kp: 3
Solar Wind: 631 km/s at 12.0 protons/cm3, Bz is -4.0 nT
(Apr 25, 2017 at 0821 UT) :: [ Other Kp graphs ]
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio

For April 2017 using the predicted smoothed SSN and Flux.

Created by NW7US on July 04, 2011

These NW7US radio signal path propagation tables are set up to cover main regions of the world. Each chart displays the FOT (or Optimal Working Frequency) at each UTC hour, for the paths given.

These radio frequencies are a percentage below the MUF (Maxiumum Usable Frequencies), and should be acurate for about 80 percent of the month. However, if a geomagnetic storm, a solar flare, or other event occurs, there is no promise that a signal will actually make it through the path in question. Often, during ionospheric storms and solar events (like a solar flare), the FOT is lower, or the path might even be closed.