Saturday, February 23, 2013

Amateur-Satellite Service & Weak Signal Users

The IARU Region 1 2013 Interim Meeting slated for Vienna, Austreia in April will be discussing two proposals of importance to Amateur-Satellite Service and weak signal users. One that’s not very controversial is an amendment to the 28 MHz Bandplan to remove of the downlink only restriction in the 29.300 to 29.510 MHz satellite segment. But the other has raised some eyebrows. The one proposes the introduction of a new satellite downlink band for CW and SSB transponders at 144.000 to 144.035 MHz.

The latter proposal could have the affect of putting United States hams in a rather precarious position. As pointed out on the W6YX VHF Reflector, SSB transmissions are not allowed below 144.100 in the US, even if they come from space. More important is that 144.0 to 144.035 is already used almost exclusively for C-W based Earth-Moon-Earth communications and experimentation and interference from SSB voice would not be very welcome in that spectrum. (IARU-R1)
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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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