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190-00906-01 GTX 23 Installation Manual
Rev. C Page 2-4
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.
Table 2-3 Cable Specifications
Max. Length
(feet – [m])
Insertion loss
(dB/100ft)
Carlisle IT 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: Carlisle
Interconnect Technologies
100 Tensolite Drive
St. Augustine, FL 32092
Tel: 800-458-9960
904-829-3447
Fax: 904-829-3447
www.carlisleit.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.