It’s been a half century since single sideband (SSB) supplanted amplitude modulation (AM) as the most popular voice mode on HF, due largely to its spectrum efficiency, occupying roughly half the bandwidth of an AM signal. Now, there’s a new digital voice mode from FreeDV called Radio Autoencoder, or RADE, that occupies half the bandwidth of an SSB signal and reportedly provides more natural-sou...

ARRL with ARRL The National Association for Amateur Radio® is following two new federal proceedings concerning radio frequency (RF) exposure. On September 17, 2026, the FCC and the U.S. Department of Health and Human Services (HHS) initiated parallel comment periods on RF safety issues. Neither inquiry changes the current FCC RF exposure rules that apply to all radio amateurs but could lead to ...

Solar activity is likely to continue at low levels with isolated to
occasional C-class flare activity, along with a slight chance for
R1-R2 (Minor-Moderate) M-class flare events, through September 25,
according to NOAA’s Space Weather Prediction Center. The SWPC reports
that nine sunspot regions are on the visible disk, including a new
Region 4541. There were three solar flares observed in the past ...

Solar flare activity is expected to remain at very low levels, with a
chance for isolated C-class flares through September 19, according to
NOAA's Space Weather Prediction Center (SWPC). Solar wind speed was
steady near 530 km/s, and negative polarity CH HSS (coronal hole
high-speed stream) effects are anticipated to persist through September
18, with additional enhancements likely today due to flan...