VisionMaster Ship’s Manual Chapter 1
Technical Specification Pulse Length
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8.2 Pulse Length
Three pulse length options are available:
•Short Pulse
• Medium Pulse
• Long Pulse.
Pulse lengths can only be selected on a Master Display, when the display is
in Transmit.
The pulse lengths available depend on the selected range scale.
Where a change of range scale results in the pulse length having to change
then the pulse length closest to the existing range scale is automatically
selected. If the display’s requested pulse length does not match the pulse
length of its connected transceiver a pulse length error alarm is raised.
8.3 Transceiver Tuning
Two transceiver tuning modes are available, Automatic Frequency Control
(AFC) and Manual. The current level of tuning is indicated by a shaded bar
adjacent to the caption.
For a Master Display there are three tuning controls:
• AFC On/Off (power on default)
• Coarse Tune
• Manual Fine Tune
For a Slave Display the tuning mode and tune level are not controlled by the
display but mirror the values of the connected transceiver.
The coarse tune level control allows the centre tune frequency to be set up for
the transceiver to which a display is connected This control is typically done at
Commissioning with the system default set to the centre value of the AFC tune
range. A different level is stored for each transceiver and restored both at
power on and when the transceiver is selected.
During the coarse tuning process any configured Sector Blanking is
suppressed, when coarse tuning is complete the Sector Blanking is restored
to its original setting.
When AFC is turned off manual fine tune is available for the operator to tune
the connected transceiver.
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