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Latest MUF / FOT Charts :: Propagation Resource Center :: HFRadio.org

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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 30-Dec-24 1624 UTC.

Sun Spots: 209 as of 12/29/2024 :: Flux: 255 | Ap: 5 | Kp: 1.67
Solar Wind: 328 km/s at 2.0 protons/cm3, Bz is -2.0 nT
(Dec 30, 2024 at 1615 UT) :: [ Other Kp graphs ]

Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio

For December 2024 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.

Available FOT Charts for:

[ US West ] [ US Central ] [ US East ] [ Hawaii ]
[ Northern South America] [ Central South America ] [ Southern South America ]
[ Western Europe ] [ Eastern Europe ] [ Japan ] [ Australia ] [ India ]

[ Main Propagation Center ]