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I recommend the following...

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NEW! ACE HF Pro
Best propagation modeling and circuit simulation software for Amateur and Shortwave Radio Operators
ACE-HF Modeling Software


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PropLab Pro
Best ionospheric ray-tracing software for Radio Operators
PropLab Pro Ray-tracing Software


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Take a listen to the Space Weather Podcast!

NW7US Space Weather / Radio Proapgation Podcast; E4 - Subject: No more sunspots by 2015!? It is possible, if the trend revealed in current sunspot research at Kitt Peak, AZ, continues. Listen now!

Podcast home: NW7US Podcast


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


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- 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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Other links of interest:

- PropNET - live propagation studies

Want to learn about Propagation and Space Weather? - Take the STD Space Weather Education Course, today!

- Shortwave Radio Resource Center
- Shortwave Broadcasting Search

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Check out some of the other activities that I am involved in:
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This page was rendered on 02-Sep-14 0145 UTC.

Sun Spots: 90 as of 08/31/2014 :: Flux: 127 | Ap: 11 | Kp: 3
Solar Wind: 406 km/s at 4.0 protons/cm3, Bz is -4.0 nT
(Sep 02, 2014 at 0138 UT) :: [ Other Kp graphs ]
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio

For September 2014 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.