Friday, February 22, 2013
Australian amateurs could soon loose access to the band from 2300 to 2302 MHz
The Australian Communications and Media Authority or ACMA has informed the Wireless Institute of Australia of proposed changes to spectrum usage in the 2300 #to 2302 MHz band. Changes that will result in Advanced Licensees losing access to that spectrum.
The ACMA proposes to acquire the spectrum for LTE radio purposes. LTE, or Long Term Evolution, marketed as 4G LTE, is a wireless standard for high-speed data for mobile phones and data terminals. The change would give LTE services the full 100MHz segment from 2300 #to 2400MHz, which would resultin twenty 5MHz LTE channels
Losing any spectrum is of great concern to Australian radio amateurs as this secondary allocation is the only viable option for Earth-Moon-Earth contacts to Region II where the this activity is on 2304 MHz or Region I which uses 2320 MHz. After the reallocation Australian amateur EME activity would be confined to 2400 MHz and above, where wireless medical and Wi-Fi equipment is likely to cause interference weak signal reception by EME stations. And for hams in VK land it could mean that most EME operations could come to an end.
The Australian Communications and Media Authority plans to recommend the change to the Minister for Broadband Communications and Digital Economy in the near future. If the Minister approves the change radio Australian amateurs will probably lose access to the spectrum sometime in 2015. More on this situation is on-line at wia.org.au (WIA)
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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