F15E Radar question.

Hey all...

I'm an enthusiast of the game Janes F15 (a fairly high fidelity F15E sim;
old but still great) and I was wondering why the A-G radar mode works the
way it does...

Essentially, to get a patch-map of the target area, the target area can't be
in the "bore" of a sixty-degree arc directly in front of the aircraft. It
has to be within the port or starboard thirty degree arcs, and cannot
be...well, it's hard to describe but if you know what I'm talking about this
should make sense:

When the radar is set to A-G mode, and you're trying to make a patch map, as
I said the cursor cannot be directly in boresight, nor can you bring the
cursor 2/3rds of the way down the MFD. Attempting to do either gets you a
GIMBAL LIMIT error and the radar won't scan the area you tried to snap.

What this means is that if you want to map the target area, you must
approach it offset so that it is in the ten-to-eleven o'clock position or
the one-to-three o'clock position; once you've built the patch map you can
then pick out targets on the map and enter attack mode.

So, why is the radar so limited in it's coverage? The blind spot directly
in front of the radar is particularly puzzling. I mean, if I'm in A-A, the
whole antenna does TWS or of course Boresight modes or whatever.

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