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AUSTRALIAN HF MARINE WEATHER FAX FREQUENCIES
Australian HF Marine Weather FAX Frequencies
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Australian Bureau of Meteorology HF Marine Weather FAX Frequencies
The
Bureau of Meteorology broadcasts its marine weather HF radio
services for high seas and Australian coastal areas from
transmitters at Charleville in Queensland and Wiluna in Western
Australia. Identifiers are VMC (for services from Charleville) and
VMW (for services from Wiluna).
VMC (Australia Weather East) broadcasts for the following areas:
·
Coastal Waters areas off
Queensland, New South Wales, Victoria and Tasmania.
·
High Seas for the
Northern, North Eastern and South Eastern high seas areas.
VMW (Australia Weather West) broadcasts for the following areas:
·
Coastal Waters areas off
South Australia, Western Australia and Northern Territory.
·
High Seas for the
Northern, Western and South Eastern high seas areas.
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VMC Fax
frequencies (kHz):
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Times
are the local time (EST) at the transmitter.
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Activity
Times
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Frequency
(kHz)
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Dial
Frequency (kHz)
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Daytime (5am-7pm)
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20469.0
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20467.1
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Night-time (7pm-5am)
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2628.0
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2626.1
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Anytime
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5100.0
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5098.1
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11030.0
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11028.1
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13920.0
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13918.1
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VMW Fax
frequencies (kHz):
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Times
are the local time (WST) at the transmitter.
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Activity
Times
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Frequency
(kHz)
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Dial
Frequency (kHz)
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Daytime (5am-7pm)
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18060.0
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18058.1
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Night-time (7pm-5am)
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5755.0
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5753.1
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Anytime
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7535.0
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7533.1
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10555.0
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10553.1
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15615.0
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15613.1
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Technical
characteristics of Voice and Fax HF transmissions
Modulation: FSK
(F3C)
Emission
code: 3K00F3C
FSK
Carrier: 1900
Hz
Shift: White
+400 Hz, Black -400 Hz
Scan
line frequency: 2
lines per second (120 lines per minute)
Scan
line stability: Within
5 parts in 1,000,000
Index
of co-operation: 576
Scanning
line density: 3.8
lines per millimetre (96 lines per inch)
Picture
format: Comprises
start, phasing, picture and stop sequence as detailed below
Start
signal: Carrier
modulated for 5 seconds by alternate Black and White at a rate
of 300 Hz
Phasing
signal: 60
scan lines, each scan line comprising White level for 25
milliseconds followed Black level for 475 milliseconds
Picture
signal: Line
to start with 25 milliseconds White level, followed by one line
of picture content uniformly occupying the remaining 475
milliseconds. This format to continue until entire picture
content has been transmitted
Stop
signal: Carrier
modulated for 5 seconds by alternate Black and White at a rate
of 450 Hz, followed by 10 seconds of Black level
SSB
Receiver tuning frequency: (for
a standard WMO facsimile decoder) 1.9 kHz below the published
transmit frequencies
Tuning
Tone: Most
charts are preceded by 60 seconds of 'tuning tone' (white
signal) to allow receivers to automatically tune and capture the
chart.
The 'tuning tone' precedes the scheduled transmission time of a
chart.
Some charts could not be preceded by 'tuning tone' as there is
insufficient idle period preceding. To automatically capture
these charts, set your receiver to wake up 2-3 minutes earlier
and tune-in on the tail-end to the previous transmission.
For more information on
Australian HF Marine Weather broadcasts. See: http://www.bom.gov.au/marine/radio-sat/marine-weather-hf-radio.shtml
International
weather FAX services: https://weatherfax.com/stations/
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last revised 20 May, 2024
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