-SYNC: Correction factor for synchronisation.
Basic set-up is +0
-RPM: Choose 60, 90, 120, 240 revs per minute
or AUTO (automatic recognition)
Generally used: 120 rpm
A variance is only necessary when the programme is not exactly
synchronised.
The projection of a facsimile signal occurs in that the pattern is
scanned at a certain speed from the chart lay-out.
This speed must coincide with the evaluation of the decoder, so that
the signal is printed out correctly. At the start of a transmission
impulses are beamed out, enabling the receiver to synchronise. The
FMD is capable of synchronising automatically when on AUTO.
However since the transmitting station scans the weather charts at a
set speed, by entering the same speed instead of AUTO, the picture
quality can be improved.
-LEVEL: Choose between 833 – 1875 Hz or AUTO
basic set-up: 1500 or AUTO
In this way the level is set, that a tone will be evaluated either as
WHITE or BLACK. The level frequency is set basically at 1500Hz.
Units with software verion4.0 onwards have by selecting <AUTO>, an
automatic standard set-up of 1500Hz. Manual adjustment is still
possible and after testing the quality of cloud projections, can be
stored in the timer.
The STATUS of synchronisation of the decoder is shown in the last line
of the display.
-WAIT: means that no synchronisation has been perceived nor
any evaluable signal. After receipt of the start impulse, <SYNC> will
be displayed for a short time and the printer will be adjusted
automatically.
At this moment <PRINT> will appear on the display.
By pressing <PRINT>, possibly more than once, the print out can be
initialised manually. Initialising after the synchronisation signal is not
possible as the start of the line will not be recognised. When the
decoder is activated before the beginning of a weather chart
transmission and the synchronisation has been correctly recognised,
the print out will commence automatically
The parameters for the reception of a weather chart transmission
can also be stored and can be RECALLED into activation. It is simpler
to store the parameters in the TIMER function.
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