Wednesday, September 29, 2010

The SDR Cube

I posted back in August (Tmate (what your SDR always wanted) I was told by several that SDR is not a popular thing here in the U.S. Looks like they maybe wrong.
While browsing around the ARRL web site I notice an article in which it mention SDR Dominating the 2010 ARRL/TAPR Digital Communications Conference.
While reading the article I was led to the web-page by George Heron, N2APB and Juha Niinikoski, OH2NLT, where they introduced the SDR Cube project.
This definitely looks cool to me.

For more on the SDR Cube;
click here
They also have a yahoo group;
click here

George N2APB and Juha OH2NLT have also added videos demonstrating the SDR Cube in action. The video segments include:- Overview- Tuning a CW station (two clips)- Tuning SSB stations- CW QSO with YL2QT- Tuning an RTTY station
These videos can be seen; click here
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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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