ARLA/CLUSTER: Novo modo digital FT8 coloca beacon australiano "fora do ar"

[João Costa > CT1FBF]

New digital mode puts beacon off air

A clash has occurred on 6-metres in Australia with the popular FT8 digital
mode, introduced in June 2017 nominating 50.313 MHz as a worldwide
operating frequency, already occupied by a propagation beacon.

The Barossa Valley beacon VK5RBV has been switched off to avoid interfering
with stations running FT8.

Mind you, VK5RBV has been operating for many years on 50.315 MHz, but the
developers of FT8 have nominated 50.313 MHz as its operating frequency.

The WIA Technical Advisory Committee is carefully looking at the matter and
welcomes input as it looks for a new beacon frequency.

The obvious choice would appear to be the band segment beginning at 50.400
MHz. This segment has already been adopted by IARU Region I as its new
exclusive beacon segment, and it is logical for us to follow the same path.

This may be a forerunner of similar clashes as more new digital modes come
into use in the same part of the band.

FT8 is also becoming popular on 2 metres, and may be ideally suited on a
group of spot frequencies recommended for modes of different bandwidths.

The narrow band channel on 144.320 MHz is the logical one for FT8 in the
WIA band plan, but it's noted that 144.313 MHz has also been used for FT8.

The new digital mode of HF at weak signal levels lower power levels and
almost any antenna is enabling lots of contacts, but the trend on 6m seems
to be to use it on high power levels.

FT8 in its description has been designed for sporadic E propagation where
signals may be weak and fading, openings may be short in duration, enabling
fast completion of reliable QSOs.

*Jim Linton VK3PC*

Wireless Institute of Australia <http://www.wia.org.au/>
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