Honeywell International Inc. 9PGTPA-100A Manuel D’Utilisation
Page 2007
1 Dec 2003
34-45-4
7
MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
(i)
Calculate the round-trip (receive/transmit) cable delay in the top antenna cable
route and then the bottom antenna cable route as follows:
route and then the bottom antenna cable route as follows:
Length of cable [see step (a)] X nanosecond delay per foot [see step (i)] X 2
(round-trip) = cable run delay.
(round-trip) = cable run delay.
Example: Top cable length = 65 feet
Top cable delay = 1.25 nanoseconds per foot
Round-trip top cable delay = 65 x 1.25 x 2 = 162.5 nanoseconds
Bottom cable length = 20 feet
Bottom cable delay = 1.25 nanoseconds per foot
Round-trip bottom cable delay = 20 x 1.25 x 2 = 50 nanoseconds
(j)
Subtract smallest round-trip cable delay from largest round-trip cable delay to
determine cable delay difference between top and bottom antenna.
determine cable delay difference between top and bottom antenna.
Example: Top round-trip cable delay = 162.5 nanoseconds
Bottom round-trip cable delay = 50.0 nanoseconds
Top/Bottom Cable Delay Differential = 112.5 nanoseconds
NOTE: Antenna delay program pins are supplied on the TCAS processor rear
connector that let the straps to be installed to adjust for maximum 350
nanosecond delay difference between the top and the bottom antenna
cable routes. Providing the top/bottom antenna cable delay differential is
not more than 350 nanoseconds, selection of the correct antenna delay
program pin strapping will adjust the delay differences to 50 nanoseconds
or less.
nanosecond delay difference between the top and the bottom antenna
cable routes. Providing the top/bottom antenna cable delay differential is
not more than 350 nanoseconds, selection of the correct antenna delay
program pin strapping will adjust the delay differences to 50 nanoseconds
or less.
If the top/bottom cable delay difference calculated in step (k) is more than 350
nanoseconds, steps (h) through (k) must be repeated using different cable type(s).
nanoseconds, steps (h) through (k) must be repeated using different cable type(s).
(k)
Refer to Interwiring Diagrams Figure 2015. If the length of the cable route to the top
antenna, measured in step (a), is longer than the length of the cable route to the
bottom antenna measured in step (a), strap the antenna delay program pin on
TCAS processor connector RBP pin 7G to common on RBP pin 7K. This lets the
TCAS processor software to add the antenna delay factor to the bottom antenna
signal processing.
antenna, measured in step (a), is longer than the length of the cable route to the
bottom antenna measured in step (a), strap the antenna delay program pin on
TCAS processor connector RBP pin 7G to common on RBP pin 7K. This lets the
TCAS processor software to add the antenna delay factor to the bottom antenna
signal processing.