Saturday, August 24, 2013
US & Canada Agree on New Border Spectrum Sharing Measure
In the way of fixed services, the FCC, the U.S. National Telecommunications and Information Administration and Industry Canada struck a sharing agreement governing 71 to 76, 81to 86 and 94.1 to 95 GHz. This is intended to facilitate deployment of fixed services within the border area. Such services include backhaul for mobile broadband networks, high-speed wireless local area networks and broadband Internet access over high bandwidth point-to-point links.
At 454.6625 to 454.9875 MHz and 459.6625 to 459.9875 MHz a Statement of Intent allows for creation of a nationwide digital system covering the sharing and coordination of spectrum for general aviation air-to-ground services. It provides for sharing of spectrum when operations are located within distances ranging from roughly 300 to 360 miles of the common border.
With regard to specialized mobile radio services at 896 to 901 and 935 to 940 MHz, the new arrangement governs the sharing and coordination of within roughly 60 miles of the common border and simplifies the criteria for permitting secondary users in the band. This is intended to enable more efficient use of the spectrum while protecting primary users. This particular agreement called Arrangement U may become part of a larger treaty or replacement agreement governing services operating above 30 MHz. The operational provisions of this arrangement will be applied on an interim basis pending further review. (RW, FCC, Industry Canada)
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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