Target size large sends the active signal at 13 nms Target size normal sends the active signal at 10 nms Target size small sends the active signal at 6 nms The AIM-54 can have varying active distances depending on the target size switch in the RIO's pit as this switch changes when the AWG-9's WCS sends the active command to the missile. This datalink guidance (not to be confused with military tactical data links like Link-16 or Link-4) uses the AWG-9's pulse signals, datalink transmitter at the tail of the AIM-54, and the antenna of the AIM-54 itself in order to give mid-course guidance to the missile. An exception is used for P-STT and PH-ACT when used outside of a the seeker's own detection range: the AIM-54 will fall back to the AWG-9's datalink guidance and guide on that course using that guidance until it detects the target with its own seeker. disregards if you're in PD-STT or TWS, that missile is going active off the rail). The AIM-54 can be fired in an active mode off the rail when ether in P-STT (Pulse Single Target Track), PH ACT switch is selected in the RIO seat, a TCS track is used, the missile is fired within 10nms of the target, or ACM cover is lifted upwards (which disregards any prior radar modes i.e. This mode doesn't not allow for the AIM-54 to go active in any way (unless fired within 10nms) and will basically be a super long range AIM-7. The AIM-54 will be fired in a Fox-1 mode (continuous semi-active) when the AIM-54 is fired in a PD-STT (Pulse Doppler Single Target Track) at a target. Once the missile is active, the firing aircraft no longer has to support the missile and can turn away. The sample data semi-active, like stated in the document above, is used during the mid-course guidance phase of a TWS missile shot prior to the missile going "pitbull" or fully radar active. For a pretty good explanation of the AIM-54 guidance, I'll direct you to a thesis written about the AIM-54 and AWG-9 system written by Naval Undergraduate Stephen Thornton Long. Those 3 modes are sample data semi-active (datalink mid-course guidance), continuous semi active (Fox-1 mode basically), and active (Fox-3 fire and forget). The AIM-54's operates in 4 distinct modes, 3 of which will be important to gameplay in WT.
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