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                           BROADCAST CONTROL. 	
	
Introduction.

1.   Close control is normally accomplished by having one section of fighters
controlled by ono director on ono R/T channel. This form of control obviously
has a saturation limit depending on either:-

     (a)  number of R/T channels available;

 or  (b)  number of control positions.

2.   Cover point can increase this capacity limitation up to three times
but it would not be difficult to conceive a scale of attack under which
this system would be overwhelmed.

3.   Broadcast control provides a means whereby up to twelve targets may
be handled by one control position on one R/T channel.

4.   Under conditions of voice jamming the two-way control needed for close
or cover point control is lost. To restore contact under such conditions a
medium power 2 KW Transmitter is used. This is powerful enough to break
through the limited power of any known type of jamming equipment and
give a one-way communication, i e. ground to air. It could provide a
one-way communication limited-type of close control but only on one frequency,
giving saturation again. It is therefore used to provide broadcast control
as a means of intercepting a greater number of targets.

5.   There are two occasions when Broadcast Control may be used therefor:-

     (a)  Saturation

     (b)  Voice jamming.

How is it Done? 

6.   While close control is being carried out, a broadcast control team are
tracking the same targets on their own P.P.I. and are broadcasting information
of the targets positions at one minute intervals over the medium power
transmitter frequency.

7.   If at any time conditions mike close control no longer possible, fighters
change to the medium power frequency and listen to the broadcast on their own
targets position. They then work out their own tracks to make good an
interception.

8.   It would be a simple matter to do this over land in conditions of 8/8th
blue and at low altitude, but not so over cloud or sea, or at high altitude
when it is difficult to estimate one's exact position. The procedure adopted
therefore is to use DME/DME or DME/CRDF fixing to find your own position before
working out the interception.

Form of Broadcast.

9.   The broadcast takes place on a one minute cycle and information is given
on up to twelve separate targets, or groups of targets within each minute.

10.  There is no allocation of targets to fighters. The target number
corresponds with the mission number of the fighters allotted to it e.g.

                    Target One is Mission O1's target.

                    Target Twelve is Mission 12's target, etc.
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