Gray line — The band of twilight moving around the earth.
For a short window at sunrise and sunset, the low bands can carry signals extraordinary distances. Worth setting an alarm for.
Look this up in Pocket Elmer, along with 100 more
Related words
- Watts — Transmit power.
- FT8 — A weak-signal digital mode.
- APRS — Automatic Packet Reporting System.
- Sporadic E — Sudden short-lived openings.
- CW — Continuous Wave. Morse code.
- Wavelength — The physical length of one radio wave.
- Band — A range of frequencies set aside for a purpose.
- Frequency — How fast a radio wave oscillates.