Tuesday, October 26, 2010

Articles of Interest

Radio ham Harry Johnson visits the world from his basement
When Harry Johnson was around three years old, back in 1939 or so, his grandpa carried him upstairs to a magical room at the grandparents’ house in Montana.
It was Uncle Charlie’s room, and Johnson’s memories of it resemble something from an old black-and-white monster movie.
“It was warm, and I remember the glow of vacuum tubes, and electricity sparking,” Johnson said.
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A 16-year-old brought radio to Memphis.

Alfred Cowles, a junior at Central High School, built his own transmitter to play recorded music and read stories during evening broadcasts from his Vance Avenue backyard on Amateur Radio Station 5NZ. The first sound on the airwaves here was the famous tenor Enrico Caruso singing Italian opera. The year was 1920.
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Scouts make contact with submarine

Well over 50 Scouts, mostly Cubs, and their families attended the Lake Area Amateur Radio Klub’s Jamboree on the Air in The Colony on Saturday. In all, there were over 150 attendees, which was an improvement from last year. There were Scouts from The Colony, Little Elm, Lewisville, Flower Mound and Frisco.
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My Stamp Collecting Blog

My Stamp Collecting Blog

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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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