January 2016
Beginner to intermediate
430 pages
22h 38m
English
Content preview from Radar and ARPA Manual
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THE RADAR SYSTEM - OPERATIONAL CONTROLS
243
6.4.3.2
Checking the focus
It would be most unusual to find a raster-scan display in
which the focus was not preset. Nevertheless, when pre-
paring the display the focus should be checked. The
graphics, in particular alphanumeric characters, are a
good indicator of focus. If they are blurred and indis-
tinct, focus adjustment is necessary and this should be
carried out by qualified service personnel.
6.4.3.3
Centring the
origin
The use of shift controls to centre the origin is not appli-
cable to raster-scan displays because, in a centred display,
the limit of the PPI is a graphics circle drawn abou
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