AN/APG – 68 (V5) Operations Guide

OG-APG68(V5) 03/06/2001
Expand Mode
The TWS mode has one of the most useful functions that the radar provides,
that being the ability to expand a small area of the screen to allow you to
more clearly see closely grouped contacts. The EXP button at the top of the
screen shows the current state of the EXP function
The EXP function allows you to separate out a group of contacts to
accomplish two tasks, a) to find out how many there are in a group, and b)
most importantly to designate a particular member of that group as a target.
The EXP function does not do anything special, and is not another radar
mode; it simply ‘zooms’ in on a 4nm area.
If you currently have a bugged target, the EXP function will zoom in on that
contact. If you don’t have a contact bugged the EXP box can be scrolled
around the radar to provide an expanded view of the area around the
cursors. This takes a little getting used to, but is very useful.
The thing to remember is that the expand box indicates what portion of the
radar display that is not expanded you are viewing. The diagram below show
the EXP mode in its three possible states 1= OFF, 2 = On, but with no
bugged target (note how the TAC is in the middle of the exp box) 3 = EXP on
and a bugged target, note how he box is centred around the target, and not
the TAC.
You can see whether the EXP mode is on by seeing if it is highlighted – if it is
on it will flash. The EXP box will change in size depending on the radar range
that is set, and is always to a scale 4nm.
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