PPI console
Dr./Cr
In becoming familiar with the duties and responsibilities of a radar operator on reporting equipment, it is desirable to become familiar with the overall picture of a ground
radar station.
These stations are made up of a variety of odd looking boxes or containers that house the various components necessary to the proper functioning of the
complete set.
Ordinarily, every radar set is [Two Letters, Two Words as Anchor Texted at Keys.] composed of six
primary components.
These consist
of the [Backend of and at now after above this hereof and from then does the Bottom become Frontend] transmitter that sends out the
signal, the antenna system through which the signal is sent and received, the receiver that receives the weak echo signal and amplifies it large enough to be seen, the indicator that
represents the reproducer, the timer that makes the entire set operate in pulses and the power supply to provide electricity of the correct type for the components
to function.
Many of our ground radar sets use more than one transmitter and receiver, therefore the size of the equipment varies
with the function of the set.
INDICATORS
A more thorough understanding of the
workings of a radar set will be presented at
a later time. We must not lose sight of the
problem at hand. The primary duty of a
radar operator, is to interpret indicator pres-
entations , report, record and display them .
Therefore, it is necessary for us to become
familiar with the indicators to be used in
our work. In observing several radar in-
stallations, you will notice a wide variety of
indicators being used. We will deal with
one of these indicators at a time, in order
that the information obtained will be less
confusing . The indicator that is used in radar
operating allows us to see the information
needed . When one listens to a radio at home,
the loudspeaker takes the place of the indi-
cator or scope as we may refer to it. The
same type of indicator is used in television
and many parts of a radar set are very similar. It may interest you to know that
television is used in some types of detection
equipment.
PLAN POSITION INDICATOR ( PPI)
The first type of indicator to be considered
will be known as the P.P.I. ( Plan Position
Indicator ) . The type of scope, as we shall
call it, consists of a vacuum tube with a
screen built in, upon which one sees the pic-
ture. Along with this cathode ray tube, it
is necessary to have power supplies and con-
trols to enable us to obtain the desired re-
sults. It will not be necessary to go deeply
into the mechanics of the PPI console and
explain all of its workings, however, a brief
description of the controls and what they
do will be given in order to make your
work easier.
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MAP PICTURE
The face of the PPI type of C.R.T. or
scope presents a picture of the area sur-
rounding the radar station. It depends upon
the power and type of station, just how far
the radar can see. There is a limit of course,
but most large sets will see an area of over
200 miles . This is not true under all con-
ditions , because the height of the target and
the position or site of the radar, determines
to a large degree its coverage.
SCOPE PRESENTATION
In making the picture on the screen of
the scope, a fine line of light travels around
the screen, reaching from the center to the
outside of the tube face. This line of light
is known as the sweep and it follows the
direction of the antenna as it rotates. When
the trace points toward the top of the scope
it represents true north. As the antenna
moves around, usually clockwise, the sweep
paints a picture of light and dark areas on
the screen. These light spots or areas repre-
sent aircraft, ground reflections , clouds and
interference echos . You should strive to select the desirable targets from the undesir-
able ones . These targets to dot remain bril-
liant very long after the sweep paints them,
but will remain long enough for you to deter-
mine their location and other data useful to
the success of a mission. As the sweep ro-
tates, following the direction that the an-
tenna is looking, moving targets will appear
at a different place each time the sweep
paints them. We can, therefore, determine
direction, position, speed and size of the
target under observation. With some practice
you will be able to become proficient in lo-
cating and tracking targets in the area as-
signed you.
CONTROLS
During the demonstration of the PPI indi-
cator, the effect of each control used in the
operation of the scope will be shown. These
controls will be discussed briefly in order
that you may grasp their importance and
make your work easier as an operator. Try
to visualize what each control is supposed to
do and you will save time by only using the
control or controls necessary to produce the
effect you desire. In your practice period,
you will learn the turn-on turn-off procedure
in order to operate the set. We will only
discuss the controls actually used in oper-
ation at this point.
TRACE BRILLIANCE
The first control to be considered is the
Trace Brilliance. This control, as you can
see by the name, governs the intensity of the
sweep and enables us to make the picture
just the right brilliance for proper scanning .
It is recommended that the trace brilliance
be held to a point where it is just visible.
When the signal is impressed on the screen
the intensity of the signal will show dis-
tinctly. A few trials will show you the best
operating point. Too much briliance gives
short cathode ray tube life, because the in-
tense light burns the active material from the
screen.
FOCUS CONTROL
The Focus Control is used to bring the
PPI console
Payroll id5060125
08/05/25 Title:C.C.E
D.P.N At Empl#573
PPI console
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