Sporadic E — Sudden short-lived openings.
Patches of intense ionization that make 6 and 10 meters open without warning, mostly in early summer. It is why 6 meters is called the Magic Band.
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Related words
- SSB — Single Sideband. HF voice.
- SSTV — Slow-Scan Television.
- Wavelength — The physical length of one radio wave.
- FM — Frequency Modulation. VHF and UHF voice.
- Gray line — The band of twilight moving around the earth.
- Watts — Transmit power.
- SWR — Standing Wave Ratio.
- APRS — Automatic Packet Reporting System.