Saturday, March 12, 2011
Japan Earthquake (Amateur Radio) JARL Info
The Japan Amateur Radio League (JARL) Secretary Ken Yamamoto JA1CJP reports that the disaster appears to have resulted in more than 1,300 people killed or missing.
JARL Regional HQ station JA7RL is now involved in emergency communication to support rescue and disaster relief coordination.
Ken JA1CJP said they are using 7 MHz SSB, 144 MHz SSB/FM and 430 MHz SSB/FM.
The freqency 7043 controlled by JR3QHQ the Osaka branch manager of JARL.
He is gathering incident information on radio and forwarding this information on the internet.
The channel 7075 is operated by JL3YSP in Wakayama occasionally. While 7030 kHz is the JARL emergency communication frequency in their band plan is in use by JA7RL (JARL regional HQ station).
Japan has 1.3 million hams and is not in need of emergency communication help externally, although this has been kindly offered.
Ken JA1CJP said basically the efforts being made are purely voluntary. No organised emergency communication has been arranged.
Television coverage includes the heartbreaking stories of the quake hitting and the tsunami that swept away coastal towns and felt throughout the Pacific.
Occurring late afternoon on Friday, disrupting plans for travel, it was the worst in Japan for 140 years.
Caught up in the drama was IARU Regional 3 Chairman Michael Owen VK3KI who had earlier attended an IARU conference. He’s safe and well, and hopeful of being on a flight home.
Jim Linton, VK3PC
Chairman IARU Region 3 Disaster Communications Committee.
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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