Friday, September 20, 2013

New EmComm Guidebook drom DHS

A very informative guidebook authored by Ross Merlin, WA2WDT, and titled NIFOG is described as a great go-to compendium of radio frequencies, channels, and other tidbits if information that can be essential in times of an emergency.
The guide is authored by Merlin who works in the Department of Homeland Security Office of Emergency Communications. He authored the guidebook for the agency and says that it contains page after page of frequency information, operating procedures, formulas, and rules and regulations from both the FCC and the NTIA. Specific subject material includes frequency and channel data for Fire, EMS, Police, and Law Enforcement as well as Mutual Aid channels in VHF, UHF, 700 MHz, and others. Also included is communications information for marine, aviation, NOAA weather, MURS, GMRS, FRS, and just about any radio you might encounter in an emergency.
Te guidebook is available in printed and downloadable formats. The primary Website where downloads copies are available is publicsafetytools.info. Copies printed on waterproof paper, are reportedly available free of charge from the Department of Homeland Security. Please contact NIFOG@HQ.DHS.GOV for details.
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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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