position as a reference. The datalink is automatically active when the radar is first turned on ([I]
key), so long as a friendly AWACS aircraft or Early Warning (EW) ground radar station is available in
the mission. The datalink will remain active, and targets will continue to be displayed on the HDD,
even if the radar is thereafter switched off.
Figure 54: HDD with active AWACS datalink
It should be noted that some AWACS-detected targets appearing in the radar azimuth coverage zone
may not be visible to the radar if they are outside the radar elevation scan limits in altitude. The
fighter’s radar should be controlled with the help of the HUD display.
Work in Complicated Countermeasures Conditions
In complicated countermeasures conditions, when the enemy uses passive and/or active radar
jamming, the TWS mode cannot be used. SCAN mode should be used instead. In the conditions of
strong radio-electronic countermeasures the radar cannot determine the range to the target –
instead, a vertical jamming strobe of randomly flashing target marks appears in the HUD along the
jammer’s bearing. Detection of ECM in the radar scan pattern also causes the "АП" (ECM detected)
symbol to appear at the right side of the HUD. Nevertheless, it is possible to obtain a bearing-only
"angle-of-jam" (AOJ) lock on the countermeasures strobe and to launch semi-active radar homing
(SARH) missiles, which in this case will guide in the passive "home-on-jam" (HOJ) mode.
The AOJ lock is effected by using the [;], [,], [.], [/] keys to move the radar cursor over the
countermeasures strobe, and pressing the lock-on [Enter] key. The fighter radar will then point its
antenna in the direction of the noise source and track it. The target range displayed in the HUD with
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