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2.4 Cabling and Wiring
Refer to the interconnect examples in Appendix C for wire gauge guidance.
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. It is also good practice to avoid routing cables near sharp edges
because aircraft vibration might wear away the insulation on the wires, which will leave them exposed to
moisture and potentially create arcing or intermittent short circuits.
The GTX 23 back-plate assembly utilizes a BNC-type (bayonet connection) coaxial connector.
The maximum attenuation at 1090 MHz between the unit and the antenna must not exceed 1.5 dB. This
loss specification includes connector loss; for example, through a bulkhead connector. The following table
lists examples of recommended antenna cable. One can determine the length of cable needed to connect
the transponder to the antenna, and then use the table to look up a recommended cable manufacturer and
part number that will meet the 1.5 dB loss spec. The table assumes a loss figure of 0.2 dB per connector.
Note that any 50 Ω, double shielded coaxial cable assembly that meets airworthiness requirements and the
1.5 dB maximum loss figure (including connectors) may be used.
Max. Length
Insertion loss
(feet – [m])
6' 1.3" [1.86m]
7' 7.3" [2.32m]
9' 2.0" [2.79m]
12' 6.0" [3.81m]
15' 5.4" [4.71m]
19' 9.4" [6.03m]
30' 3.6" [9.24m]
Supplier
Information
GTX 23 Installation Manual
190-00906-01
ECS Type
(dB/100ft)
18.0
14.45
3C142B
12.00
8.80
311601
7.12
311501
5.56
311201
3.63
310801
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
MIL-C-17 Type
M17/128-RG400
M17/112-RG304
M17/127-RG393
See current issue of
RG types are
Qualified Products
obsolete and are
List QPL-17.
shown for
reference only;
replaced by M17
type numbers.
RG Type
RG-400
RG-304
RG-393
Page 2-3
Revision A
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