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 tooccasional C-class flare activity, along with a slight chance forR1-R2 (Minor-Moderate) M-class flare events, through September 25,according to NOAA’s Space Weather Prediction Center. The SWPC reportsthat nine sunspot regions are on the visible disk, including a newRegion 4541. There were three solar flares observed in the past ...