Thursday, September 30, 2010

I-com Scraps D-Star Forums

One day I will purchase a D-Star rig. We only have a few repeaters in my area that are D-Star and only a couple of operators that have a D-Star rig.
I know that the local emergency communications groups are investing into this technology via grants from HLS. Anyway, It looks like Yahoo Groups hold more credibility than most realize.

Icom America scraps D-STAR forums

Icom America have announced the closing of their D-STAR forums due to the popularity of email reflectors

They have posted this message at http://www.icomamerica.com/support/forums/

"Due to the popularity of the YAHOO! D-STAR Groups and the low activity levels within the Icom America D-STAR forums, it has been made to close the Icom America D-STAR forums".

Modern web tools make forums easy to set up and many Radio Amateurs have done so, unfortunately most of them are rarely used.

Postings on email reflectors such as Yahoo and Google groups go directly into peoples Inbox and so are read by many more people which in turn generates more postings in reply.

These are a few of the D-STAR email reflectors that are available:

dstarsoftware
http://groups.yahoo.com/group/dstarsoftware

gmsk_dv_node
http://groups.yahoo.com/group/gmsk_dv_node

dstar_digital
http://groups.yahoo.com/group/dstar_digital

DVDongle
http://groups.yahoo.com/group/DVDongle

D-STAR_23cm
http://groups.yahoo.com/group/D-STAR_23cm

dstar_development
http://groups.yahoo.com/group/dstar_development

dstar-uk
http://groups.yahoo.com/group/dstar-uk

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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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