5
UP Scroll up a message.
TOP Go to the top of a message.
INTRO Allows you to select RECEIVE, SETUP, RESETS and CHOICES.
RECEIVE Turns on the receiver and displays the last message
received.
SETUP Allows you to select DONE, CLOCK, CHANNELS and DISPLAY.
RESETS Allows you to reset factory defaults or to clear the display.
CHOICES Allows you to program the stations and message types you
want
to record.
CLOCK Allows you to set the clock.
CHANNELS Allows you to set the receiver channel.
DISPLAY Allows you to set the contrast.
DONE Exits the above.
"*" In the body of a message indicates a corrupted character.
NOTES.
In the unlikely event of a supply transient causing your navtex to
malfunction a system reboot is available. To re-boot:- First switch off
the supply, then restore the supply and then press all four keys
simultaneously.
The spectrum screen displays the frequency components of the
received signal.When no navtex signal is being received (Which is for
most of the time.) then the spectrum displays a bell shaped curve
centred about the middle of the screen. A navtex signal is made up of
components that are 85Hz at each side of the centre frequency so will
produce peaks on the spectrum at +85Hz and -85Hz.
The height of these peaks represents the strength and quality of the
signal.
The station and message indent letters together with the transmission
times are available on several web sites. A excellent site run by Frank
Singleton can be found at:- http://weather.mailasail.com/Franks-
Weather/Home
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