Sunday, April 17, 2011

Amateur Radio continuing to help in Japan

Towards the bottom of my post I have past info from Japan Amateur Radio League (JARL)
Here is an update obtained from several e-mails and SARC.

The amateur radio activity is continuing to help those mainly within the disaster recovery area struck by the worst earthquake in Japan in 140 years.

IARU Region 3 Secretary, Ken Yamamoto JA1CJP said “several stations are handling medium distance information exchange on 7.030/7.043 MHz.

“The operation in VHF and UHF bands becomes more active than in earlier days. About 250 transceivers with JARL licenses are used for communications between various refugee rest places and local government offices.

“Two sets of 430 MHz repeaters have also been delivered to the disaster area and they are operational now to enhance the existing repeaters coverage and provide easier communications between hand-held transceivers.”

The big earthquake, now graded at nine on the Ritcher scale, and followed by a tsunami hit north-eastern Japan on 11 March, and crippled a nuclear power facility. More than 13,500 have been killed.

The headquarters station of the Japan Amateur League (JARL) in Tokyo, JA1RL became a disaster communication centre in the days immediately after the disaster.

Ken JA1CJP said, “It should be noted that some towns are so heavily disrupted that the local government offices are also in the refugee centres and the residents are staying in multiple places.

“In such cases, amateur radio can contribute a lot to maintain the ties between the local government and residents.”

In the long haul the emergency communications to be provided through amateur radio, as the disruption to normal life will continue for some considerable time to come.

A presentation on the Japanese earthquake triple disaster will be made at the GAREC 2011 in Sun City, South Africa, in August this year.

Jim Linton VK3PC
 Chairman, IARU Region 3 Disaster Communications Committee

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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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