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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 3-33
3.6.7 Marker Beacon Antenna Cable Termination
This section provides guidance for terminating the coaxial cable into the D-Sub connector. See
Appendix F for pin assignments. RG-400 coaxial cable is recommended for the marker beacon antenna.
Since RG-400 is too thick to fit through the backshell strain relief, RG-179 or RG-188 may be used
instead. Route the cable to the D-Sub as described in Section 2.4.11.
When terminating the coaxial cable into the D-Sub observe the following guidance (refer to Figure 3-13)
Keep the distance from the end of the exposed shield to D-Sub as short as practical.
Ensure the distance from the beginning of the exposed shield to D-Sub is no more than 1.5 inches
long.
Terminate the center conductor by directly connecting it to the D-sub through a crimp pin without
a pigtail.
Figure 3-13 below represents a suggested method for terminating the marker beacon coaxial cable using
RG-188 terminated into a high density D-Sub connector. Refer to Table 2-14 for Crimp Tool, Pin, and
Crimp Tool Insert part numbers. Terminate the antenna end with a BNC-F connector and attach to the
marker beacon antenna.
GPN
336-00044-00
USE ON CENTER
CONDUCTOR
CENTER
CONDUCTOR
GPN
336-00021-00
USE ON SHIELD
PIGTAIL
SOLDER PIGTAIL
TO SHIELD
SHRINKABLE TUBING
AROUND EXPOSED SHIELD
AND SOLDERED PIGTAIL
1.5 INCHES MAX
BEGINNING OF EXPOSED SHIELD
END OF EXPOSED SHIELD
BACK EDGE OF
DSUB CONNECTOR
RG-188
TO BNC
Connector
Figure 3-13. GMA 35 Marker Beacon Coaxial Cable D-Sub Termination
113


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