Garmin GSR 56 Installation Manual - Page 18

NOTES 1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice. 2. Extracting the #16, #18 and #20 contact requires that the expanded wire barrel be cut off from the contact. It may also be necessary to push the pin out from the face of the connector when using an extractor due to the absence of the wire. A new contact must be used when reassembling the connector. 3. For applications using 16 AWG wire, contact Garmin for information regarding connector crimp positioner tooling. 3.3 Iridium Antenna Installation For use with the GSR 56, Iridium antennas have an operating frequency range of 1616-1626.5 MHz. Minimum antenna requirements are listed in Section 1.4.4. NOTE It is the installer's responsibility to ensure that their choice of antenna meets FAA certification standards according to the specific installation. This installation manual suggests the antenna specifications listed in Section 1.4.4. Other antennas may be acceptable but their installation is not covered by this manual. There are several critical factors to take into consideration before installing an antenna for a satellite communications system, these factors are addressed in the following sections. 3.3.1 Antenna Mounting For installation mounting of the Iridium antenna, follow the manufacturer's instructions and the instructions in this Section (Section 3.3) 3.3.2 Antenna Grounding NOTE Improper grounding of the antenna can cause poor signal reception. It is very important to have good conductivity between the coaxial shield and the ground plane. This is ensured when all the fasteners properly ground the antenna base to the skin of the aircraft. The resistance between the antenna and the skin of the aircraft should be less than 10 milliohms. Page 3-2 Revision F GSR 56 Installation Manual 190-00836-00