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Page 2-4 GTX 330 Installation Manual
Revision G 190-00207-02
2.5 Cabling and Wiring
Use MIL-W-22759/16 or other approved wire, AWG #24 or larger wire for all connections. The standard
pin contacts supplied in the connector kit are compatible with up to AWG #22 wire. In cases where some
installations have more than one unit sharing a common circuit breaker, sizing and wire gauge is based on
aircraft circuit breaker layout, length of wiring, current draw of units, and internal unit protection
characteristics. Do not attempt to combine more than one unit on the same circuit breaker unless it is
specified on aircraft manufacturer approved drawings.
In some cases, a larger gauge wire such as AWG #18 or #16 may be needed for power connections. If
using #16 or #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each other.
This minimizes the risk of contacts touching and shorting to adjacent pins or to ground.
Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.
Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and
routing near aircraft control cables.
The following table lists examples of the recommended antenna cable vendors and the type of cable to be
used for specific lengths of cable. Any cable meeting specifications is acceptable for the installation.
The following table is for reference only, and lists some suitable cable types, along with the maximum
length based on an assumed loss figure of 0.2 dB per connector. Any 50 , double shielded coaxial cable
assembly that meets airworthiness requirements and the 1.5 dB maximum loss figure (including
connectors) may be used.
Max. Length
(feet – [m])
Insertion loss
(dB/100ft)
ECS Type MIL-C-17 Type RG Type
6' 1.3" [1.86m] 18.0 M17/128-RG400 RG-400
7' 7.3" [2.32m] 14.45 3C142B
9' 2.0" [2.79m] 12.00 M17/112-RG304 RG-304
12' 6.0" [3.81m] 8.80 311601 M17/127-RG393 RG-393
15' 5.4" [4.71m] 7.12 311501
19' 9.4" [6.03m] 5.56 311201
30' 3.6" [9.24m] 3.63 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
www.ecsdirect.com
See current issue
of Qualified
Products List
QPL-17.
RG types are
obsolete and
are shown for
reference only;
replaced by
M17 type
numbers.