Garmin GDU 370 Installation Manual page 166

Secondary Method
Solder a flat braid (item 6) to the shield exposed through the window of the prepared cable assembly
(item 4). Ensure a solid electrical connection through the use of acceptable soldering practices. Use
care to avoid applying excessive heat that burns through the insulation of the center conductors and
shorts the shield to the signal wire. Slide a minimum 0.75 inches of Teflon heat shrinkable tubing
(item 5) onto the prepared wire assembly and shrink using a heat gun. The chosen size of heat
shrinkage tubing must accommodate both the number of conductors present in the cable and the flat
braid (item 6) to be attached.
Solder Sleeves:
Reference the following MIL-Specs for solder sleeves.
(M83519/1-1, M83519/1-2, M83519/1-3, M83519/1-4, M83519/1-5)
Flat Braid:
If the preferred Raychem sleeves are not being used, the individual flat braid selected should
conform to ASTMB33 for tinned copper and be made up of 36 AWG strands to form an
approximately 19-20 AWG equivalent flat braid. A circular mil area range of 1000 to 1300 is
required. The number of individual strands in each braid bundle is not specified. (e.g.
QQB575F36T062)
Teflon Heat Shrinkable Tubing:
Reference the following MIL-Spec for Teflon heat shrinkable tubing (M23053/5-X-Y).
Flat Braid as opposed to insulated wire is specified in order to allow continuing air
worthiness by allowing for visual inspection of the conductor.
3. At the same end of the shielded cable (item 4) and ahead of the previous shield termination, strip
back "Float Min" to "Float Max" (Table B-11) length of jacket and shield to expose the insulated
center conductors (Figure B-16). The "Ideal Float" length may be best to build optimally.
Preferred Method
The jacket and shield should be cut off at the same point so no shield is exposed. Slide 0.75 inches
minimum of Teflon heat shrinkable tubing (item 7) onto the cable and use a heat gun to shrink the
tubing. The chosen size of heat shrinkage tubing must accommodate the number of conductors
present in the cable.
Secondary Method
Leave a max 0.35 inches of shield extending past the jacket. Fold the exposed .35 inches of shield
back over the jacket. Slide a solder sleeve (item 7) over the end of the cable and use a heat gun
approved for solder sleeves to secure the connection. The chosen size of solder sleeve must
accommodate the number of conductors present in the cable.
4. Strip back approximately 0.17 inches of insulation from each wire of the shielded cable (item 4)
and crimp a contact (item 2) to each conductor. It is the responsibility of the installer to
determine the proper length of insulation to be removed. Wire must be visible in the inspection
hole after crimping and the insulation must be 1/64 – 1/32 inches from the end of the contact as
shown in Figure B-17.
Page B-22
Revision A
NOTE
G3X Installation Manual – Appendix B
190-01115-01