Table 3-9 Coaxial Cable Specifications; Table 3-10 Typical Cable Connector Loss; Gps Antenna (Gtx 335 With Sbas/Gps) - Garmin GTX 335 w GPS Installation Guidance

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Refer to table 3-10 for reference only and shows some applicable cable types. Any 50 Ω, double-shielded

coaxial cable assembly that meets airworthiness requirements and the permitted attenuation requirements

(with connectors) can be used. When cable loss is calculated, a loss of 0.2 dB can be used for each

connection.

Insertion Loss (dB/100ft) [1]

18.5

11.1

9.2

15.2

9.2

7.5

5.8

3.8

[1] RG type coaxial cable insertion loss can change significantly between manufacturers. The

insertion loss for RG type cables shown in this column is considered the worst case

scenario. Refer to the cable manufacturer's specification sheet for actual attenuation

(insertion loss) for the cable being used.

[2] Supplier information (for reference only): Carlisle IT: 5300 W. Franklin Drive Franklin, WI

53132 Tel: 800-327-9473 www.carlisle.com

[3] Supplier information: Refer to current issue of Qualified Products List QPL-17.

[4] RG types are obsolete and are reference only and replaced by M17 type numbers.

TNC

BNC

3.11.4 GPS Antenna (GTX 335 with SBAS/GPS)

Installation approval for the GPS antenna is not provided through this STC. The installer can use other FAA

approved data to gain a separate antenna installation approval. Antenna performance is very important to

successful operation with the internal GPS/SBAS receiver.

Refer to table 3-11 for approved SBAS/GPS antennas that meet Garmin's minimum performance

specifications. Refer to table 3.11.2 for antenna location information to verify an existing antenna location

is satisfactory for use with the GTX 335 transponder. Refer to the antenna manufacturer's installation

guidance for installation of GPS antennas.

190-00734-17

Rev. 1