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Worked on IFF as an avionics tech in the Air Force. Here are the modes:
Mode 1; used by the military when IFF was first developed. Transmits a
pair of identification numbers ranging from 00 to 77. Mode 2; addition
of 2 more identification numbers ranging from 0000 to 7777. Mode 2 was
used to identify military aircraft only. Mode 3 is the military's
version of the civilian counterpart of Mode A and Mode C and combine
both identification and altitude encoding. The ID range is from 0000 to
7777. Mode 4 is an encrypted sign-countersign method of identification
that is used exclusively by the military and our NATO allies. The Mode 4
codes are loaded into a Mode 4 computer that interface with a suitably
equipped M4 IFF transceiver.
Hope this helps
Scott
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<p class=3DMsoNormal><span class=3DGramE><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Worked on IFF as an =
avionics tech in
the Air Force.</span></font></span><font size=3D2 face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'> Here are the modes: Mode =
1; used by
the military when IFF was first developed. <span class=3DGramE>Transmits =
a pair
of identification numbers ranging from 00 to 77.</span> <span =
class=3DGramE>Mode
2; addition of 2 more identification numbers ranging from 0000 to =
7777.</span>
Mode 2 was used to identify military aircraft only. <span =
class=3DGramE>Mode 3 is
the military’s version of the civilian counterpart of Mode A and =
Mode C
and combine</span> both identification and altitude encoding. The ID =
range is
from 0000 to 7777. Mode 4 is an encrypted sign-countersign method of =
identification
that is used exclusively by the military and our NATO allies. The Mode 4 =
codes
are loaded into a Mode 4 computer that interface with a suitably =
equipped M4
IFF transceiver.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hope this helps<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Scott<o:p></o:p></span></font></p>
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