1 25-meter band - definição. O que é 1 25-meter band. Significado, conceito
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O que (quem) é 1 25-meter band - definição

LIST OF SHORTWAVE RADIO SPECTRUM BANDS
11-meter band; 11m broadcast band; 13m broadcast band; 15m broadcast band; 16m broadcast band; 19m broadcast band; 22m broadcast band; Meter band; International broadcast bands; SW bands; 120-meter band; 90-meter band; 31-meter band; 25-meter band; 22-meter band; 19-meter band; 16-meter band; 13-meter band; 41-meter band; 75-meter band

Matthew 1:25         
TWENTY-FIFTH VERSE OF THE FIRST CHAPTER OF THE GOSPEL OF MATTHEW
Mt. 1:25
Matthew 1:25 is the twenty-fifth and last verse of the first chapter of the Gospel of Matthew in the New Testament. Joseph has awakened from a dream in which an angel gave him instructions about the birth of Jesus.
630-meter band         
  • Regions with an amateur radio allocation near 500 kHz in early 2011. Dark blue indicates official allocations based on WRC-12. Light blue indicates official allocations that are outside the WRC-12 frequencies (e.g. Norway). Green indicates experimental allocations. Operation is prohibited in red regions.
AMATEUR RADIO FREQUENCY BAND
600-meter band; 630-meter amateur radio band; 600-meter amateur band; 600-meter band (amateur radio); 630m band; 600-meter amateur radio band
The 630-meter (or 600-meter) amateur radio band is a frequency band allocated by the International Telecommunication Union (ITU) to amateur radio operators, and it ranges from 472–479 kHz, or equivalently 625.9–635.
20-meter band         
AMATEUR RADIO FREQUENCY BAND
20 meters; 20 meter band; 20m; 20m band; 20 meter
The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.

Wikipédia

Shortwave bands

Shortwave bands are frequency allocations for use within the shortwave radio spectrum (the upper medium frequency [MF] band and all of the high frequency [HF] band). Radio waves in these frequency ranges can be used for very long distance (transcontinental) communication because they can reflect off layers of charged particles in the ionosphere and return to Earth beyond the horizon, a mechanism called skywave or “skip” propagation. They are allocated by the ITU for radio services such as maritime communications, international shortwave broadcasting and worldwide amateur radio. The bands are conventionally named by their wavelength in metres, for example the ‘20 meter band’. Radio propagation and possible communication distances vary depending on the time of day, the season and the level of solar activity.