User's Manual
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−19
15 Dec 2005
Table 4−1. TCAS 3000 Computer Unit Loading/Gradient Specifications (cont)
Connector Pin
Designation
Functional Description
LMP−2 Bottom Antenna 90 Degree Port
J2 on the antenna is color−coded black. This antenna port is called the 90 degree port
because it produces a transmission pattern in the right wing quadrant of the aircraft. J2
is physically located toward the left wing of the aircraft when antenna is properly
installed. The TCAS computer unit checks the built in dc to ground resistance of this
antenna port. It must detect approximately 8000 ohms or it reports antenna test failure.
LMP−3 Bottom Antenna 180 Degree Port
J3 on the antenna is color−coded blue. Same as top antenna 180 degree port (LTP−3).
LMP−4 Bottom Antenna 270 Degree Port
J4 on the antenna is color−coded red. This antenna port is called the 270 degree port
because it produces a transmission pattern in the left wing quadrant of the aircraft. J4 is
physically located toward the right wing of the aircraft when properly installed. The TCAS
computer unit checks the built in dc to ground resistance of this antenna port. It must
detect approximately 2000 ohms or it reports antenna test failure.
TCAS Computer Unit Left Bottom Plug (LBP)
LBP−1 115 V ac Power Input (H)
This pin along with the 115 V ac Power Input (C) line (pin LBP−7) provides the 115 V ac
power requirements for the TCAS computer unit.
NOTE: The TCAS computer unit operates with either 115 V ac, 400 Hz, or 28 V dc
input power. If 115 V ac is used, the power should be connected through a
5 Amp circuit breaker, and the pins for the 28 V dc input should be left
unconnected.
LBP−2 Spare Pin
LBP−3 +28 V dc Power Return (LO)
See LBP−10.
LBP−4 Spare Pin
LBP−5 Fan 115 V ac Power Output (H)
This pin along with the Fan 115 V ac Output Power (C) line (pin LBP−9) provides 115 V
ac power for an external fan.
LBP−6 Spare Pin
LBP−7 115 V ac Power Input (C)
See LBP−1.
LBP−8 Signal Ground
Connect to Aircraft Signal Ground.
LBP−9 Fan 115 V ac Power Output (C)
See LBP−5.