ARLA/CLUSTER: A 1 de janeiro de 2013 vários paises vão ter acesso ao segmento de 472 a 479 kHz (630 Metros)

[João Costa > CT1FBF]

New MF band

Following the World Radio Conference in 2012, the frequency band 472
kHz to 479 kHz (630 Metres) will formally be available to radio
amateurs in many countries from January 1, 2013.

The latest announcement comes from the Australian Communications and
Media Authority that Advanced Licence holders generally get access to
the band on a secondary basis.

As a result of the International Telecommunications Union (ITU) at
WRC12, the radiated power by amateur service stations is 1w pX EIRP,
however due to their distance from some countries administrations
including Australian, can use up to 5w pX EIRP with a maximum
bandwidth of 2.1 kHz.

Although available on a secondary basis to radio amateurs in all ITU
regions, as a compromise many countries are not going to allow any
amateur service access to the band.

Within Australia there are exclusion zones at the Exmouth and Timor
regions, where amateur radio use is not permitted due to the existence
of aeronautical non-directional beacons used for local navigation at
airports.

The ITU case included that ground wave propagation in the under-used
spectrum results in reliable communication over medium and large
ranges, and is not dependent upon the ionosphere. It makes an ideal
spot for radio amateurs to study anomalous propagation.

The new medium frequency allocation takes formal effect in Australia
on January 1, 2013, although several countries have already allocated
it domestically.

As a prelude to a secondary allocation at WRC12, Australia, Canada,
Germany, Sweden, New Zealand, United Kingdom plus parts of Europe, the
USA and some others allowed temporary use or experimental operations
on nearby frequencies.

WRC12 also re-allocated the original 500 kHz frequency, at the bottom
edge of the AM broadcasting band which used previously as an
international CW distress frequency, back to exclusive maritime mobile
use for new navigation systems.

Jim Linton VK3PC