Garmin GTX 320A, Руководство по установке

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GTX 320/320A Installation Manual Page 2-3
190-00133-01 Rev M
2.3.4 Antenna Cable Installation
When routing antenna cables, observe the following precautions:
x
All cable routing should be kept as short as possible and as direct as possible.
x
Avoid sharp bends.
x
Avoid routing cables near power sources (e.g., 400 Hz generators, trim motors, etc.) or near power for
fluorescent lighting.
x
Avoid routing cable near ADF antenna cable (allow at least a 12-inch separation).
The table below lists the recommended 50 ohm double shielded coax antenna cable vendor and the type to be
used for specific lengths of cable. Adherence to this table will ensure that the coax installation will not exceed the
maximum allowable 1.5 dB attenuation at the transmitter operating frequency of 1090 MHz.
Table 2-1 Antenna Coax Cable, Vendor & Type
Max. Length
(feet)
ECS Type MIL-C-17 Type RG Type
8.8 M17/128 RG400
10.0 3C142B
12.5 M17/112 RG304
17.0 311601 M17/127 RG393
21.0 311501
27.0 311201
41.0 310801
Supplier
Information Vendor: Electronic
Cable Specialists
5300 W. Franklin
Drive
Franklin, WI 53132
Tel: 800-327-9473
414-421-5300
Fax: 414-421-5301 MIL-C-17 types:
See current issue of
Qualified Products
List QPL-17. RG types: See
current issue of
Qualified Products
List QPL-17.
2.3.5 Antenna Cable Connectors
One of two rack connectors is provided (item 6 or 12 in the installation drawing, figure B2). RF Adapter item 12
(P/N 330-00326-00) requires the cable to be terminated to an appropriate type BNC plug (provided by installer),
which is then attached to item 12. Any 50 ohm, double shielded cable may be used, provided it introduces less
than 1.5 dB attenuation at 1 GHz including the connector.
Connector item 6 (P/N 330-00198-00) requires the cable to be terminated directly to it and can accommodate only
M17/128 (RG-400) cable. The completed cable including connectors must introduce no more than 1.5 dB
attenuation at 1 GHz. Instructions for installing the item 6 are shown in Figure 2-1 and detailed in the following
steps A-G.