Garmin GTX 32 Installation Manual - Page 18

2.4 Cabling and Wiring Use MIL-W-22759/16 or other approved wire, AWG #24 or larger wire for all interface 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 maximum coaxial cable attenuation at 1090 MHz must not exceed 1.5 dB, including connectors. 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 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 (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 Insertion loss (dB/100ft) ECS Type 18.0 14.45 12.00 8.80 7.12 5.56 3.63 3C142B 311601 311501 311201 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 Qualified Products List QPL-17. RG Type RG-400 RG-304 RG-393 RG types are obsolete and are shown for reference only; replaced by M17 type numbers. Page 2-4 Revision F GTX 32 Installation Manual 190-00303-60