Garmin GMA 347, Руководство по установке

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GMA 347 Installation Manual Page 3-5
190-00325-01 Revision A
1. Attach the Shield Block(s) (2) to the backshell (1) by inserting the flathead screws (3) through the
holes on the Shield Block and threading into the tapped holes on the backshell (1). (See Figure 3-1).
The appropriate number of Shield Block kits is included in the GMA 347 connector kit.
Table 3-5. Shielded Cable Preparation
Float
Min
Float
Max
Ideal
Float
Window
Min
Window
Max
Ideal
Window
1.5” 2.5” 2.0” 3.0” 5.5” 4.5”
Figure 3-2. Shielded Cable Preparation
2. At one end of a shielded cable (4) measure back a distance between “Window Min” to “Window
Max” (Table 3-5) and cut a window (max size 0.35”) in the jacket to expose the shield. (See Figure
3-2). Use caution when cutting the jacket to avoid damaging the individual braids of the shield.
When dealing with a densely populated connector with many cables it may prove beneficial to
stagger the windows throughout the “Window Min” to “Window Max” range. If staggering is not
needed the “Ideal Window” length is recommended.
Tools needed to Accomplish the Window Cut:
•
Coaxial Cable Stripper
•
Thermal Stripper
•
Sharp Razor Blade
3. Connect a Flat Braid (6) to the shield exposed through the window of the prepared cable assembly
(4). The Flat Braid goes out the front of the termination towards the connector. Do not allow wires
to exit the rear of the termination and loop back towards the connector. (See Figure 3-2). Make this
connection using an approved shield termination technique. Refer to FAA Advisory Circular AC
43.13 as a reference for termination techniques.
Preferred Method, Solder Sleeves:
Slide a solder sleeve (5) onto the prepared cable assembly (4) and connect the Flat Braid (6) to the shield
using a heat gun approved for use with solder sleeves. It may be easier to use a solder sleeve with a pre-
installed Flat Braid versus having to cut a length of Flat Braid to be used. The chosen size of solder
sleeve must accommodate both the number of conductors present in the cable and the Flat Braid (6) to be
attached.