Friday, May 15, 2015

Amateur Radio Emergency Frequencies

Here is a list of amateur radio emergency frequencies to keep in mind when both looking for radios and coming up with a emergency communications plan:

34.90:       Used nationwide by the National Guard during emergencies.

39.46:       Used for inter-department emergency communications by local and state police forces.

47.42:       Used across the United States by the Red Cross for relief operations.

52.525:    Calling frequency used by ham radio operators in FM on their six-meter band.

121.50:     International aeronautical emergency frequency.

138.225: Disaster relief operations channel used by the Federal Emergency Management Agency; it is active during earthquakes, hurricanes, floods, and other catastrophic events.

146.52:    Used by ham radio operators for non-repeater communications on the two-meter band; it is very busy in many parts of the country.

151.625:  Used by “itinerant” businesses, or those that travel about the country. Circuses, exhibitions, trade shows, and sports teams are some of the users you can hear. Other widely used itinerant channels are 154.57 and 154.60.

154.28:    Used for inter-department emergency communications by local fire departments; 154.265 and 154.295 also used.

155.160: Used for inter-department emergency communications by local and state agencies during search and rescue operations.

155.475: Used for inter-department emergency communications by local and state police forces.

156.75:    Used internationally for broadcasts of maritime weather alerts.

156.80:   International maritime distress, calling, and safety channel. All ships must monitor this frequency while at sea. It is also heavily used on rivers, lakes, etc.

162.40:   NOAA weather broadcasts and bulletins.

162.425: NOAA weather broadcasts and bulletins.

162.45:   NOAA weather broadcasts and bulletins.

162.475: NOAA weather broadcasts and bulletins.

162.50:   NOAA weather broadcasts and bulletins.

162.525: NOAA weather broadcasts and bulletins.

162.55:    NOAA weather broadcasts and bulletins.

163.275: NOAA weather broadcasts and bulletins.

163.48750: Used nationwide by the National Guard during emergencies.

163.51250: The national disaster preparedness frequency used jointly by the armed forces.

164.50: National communications channel for the Department of Housing and Urban Development.

168.55: National channel used by civilian agencies of the federal government for communications during emergencies and disasters.

243.00: Used during military aviation emergencies.

259.70: Used by the Space Shuttle during re-entry and landing.

296.80: Used by the Space Shuttle during re-entry and landing.

311.00: Flight channel used by the U.S. Air Force.

317.70: Used by U.S. Coast Guard aviation.

317.80: Used by U.S. Coast Guard aviation.

319.40: Used by the U.S. Air Force.

340.20: Used by U.S. Navy aviators.

409.20: National communications channel for the Interstate Commerce Commission.

409.625: National communications channel for the Department of State.

462.675: Used for emergency communications and traveler assistance in the General Mobile Radio Service.
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My Stamp Collecting Blog

My Stamp Collecting Blog

Counter Added January 1, 2011

free counters

HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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