User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 3−57
15 Dec 2005
Table 3−10. Strap Assembly Programming Instructions (cont)
Strap
Number
Functional Description
W35 DLP INSTALLED
The DLP Installed strap specifies whether the transponder is connected to an Airborne
Data Link Processor system. The strap is selected as follows:
Gnd = DLP is not installed
Open = DLP is installed
W36 TCAS II INSTALLED
The TCAS II Installed strap specifies whether the transponder is connected to a TCAS II
system. The strap is selected as follows:
Gnd = TCAS II is not installed
Open = TCAS II is installed
NOTE: If both TCAS II and TCAS I (strap W40) are set (Grounded), the transponder
will default to TCAS II operation. Both straps should not be cut.
W37
W38
ANTENNA CABLE INSTALLATION: (B0, B1)
The Antenna Cable Install straps are used to set the system for either a single (bottom)
antenna installation, or a diversity installation. In the diversity installation, the straps
adjust for the difference in RF propagation times through the upper and lower antenna
cables which occur because of their dissimilar lengths. The antenna cable delay is
selected as follows:
Strap Number
W37 W38 Definition
Gnd Gnd Single (bottom) Antenna Installation
Open Gnd Top > Bottom Cable Length, Differential Delay >40 nanoseconds
Gnd Open Bottom > Top Cable Length, Differential Delay >40 nanoseconds
Open Open Differential Delay is <40 nanoseconds
NOTE: The differential delay is equal to two times the length (in feet) of the difference
between the top and bottom antenna cable lengths, times the characteristic
delay (nanoseconds / feet) of the cable type in use.
W39 TCAS TA DISPLAY ENABLE
The TCAS Display Enable strap allows the TCAS display to be either tunable or fixed.
The strap is not processed by the transponder, but is used by a RMU when an RSB
tuning source is selected. The strap is not used by ARINC tuning sources. The strap
definition is as follows:
Gnd = TA Display is tunable (ON / OFF / AUTO POP−UP) modes selectable
Open = TA Display is not selectable (AUTO POP−UP mode only)
W40 TCAS I INSTALLED
The TCAS I Installed strap specifies whether the transponder is connected to a TCAS I
system. The strap is selected as follows:
Gnd = TCAS I is not installed
Open = TCAS I is installed
NOTE: If both TCAS I and TCAS II (strap W36) are set (Grounded), the transponder
will default to TCAS II operation. Both straps should not be cut.