User manual GARMIN GPS 80 Release Note

[. . . ] 151st Street Olathe, Kansas 66062-3426 U. S. A. REVISION RECORD 2264 Rev. E, 25 June 1993 Change Section 3. 1 to reflect accessory configuration. H, 15 Oct 1993 Reverse Pin locations on Fig. 1-1 Add Altitude Serializer interface details. [. . . ] Figure 2-2 illustrates a typical aviation rack installation. 2. 3 CABLING AND WIRING The recommended antenna cable type is M17/155-0001 (RG-58A/U) per MIL-C-17. Maximum allowable length for this cable type is 40 feet. Other cable types with 50 ohms nominal impedance and longer lengths can be used, provided the installer insures that the attenuation does not exceed 10dB at 1. 5 GHz for the specific installation. Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and routing near aircraft control cables. 2. 4 COOLING AIR Cooling air is not required for the GPS 80, however as with any electronic equipment, reduced operating temperature can contribute to increased reliability. Additionally, location of the GPS 80 in a stack of other power dissipating equipment can produce unacceptably high ambient air temperatures around the unit. A 5/8 inch diameter air fitting is provided on the rear of the mounting rack for the purpose of admitting cooling air under such conditions. 2. 5 ANNUNCIATORS If the installation includes any electrical interface with other flight instruments, an annunciator may be required. 2. 6 EXTERNAL ALTITUDE INPUT Pressure altitude input from an external source may benefit GPS 80 system performance during times of minimal satellite coverage or poor satellite geometry. Contacts for the 37-pin connector must be crimped into the individual wires of the aircraft wiring harness. The following table lists recommended crimp tools: Non- GARMIN part numbers shown are not maintained by GARMIN and consequently are subject to change without notice. See Appendix B for information regarding obsolete stamped type contacts. Av. Q Page 10 3. 4 RACK INSTALLATION A. Figure 3-4 shows outline dimensions for the aviation rack. Install the rack in a rectangular 6. 320" x 2. 000" hole in the instrument panel. Exercise caution when installing the rack into the instrument panel. The rack is designed to facilitate removal of the GPS 80 for portable use. Deformation of the rack may make it difficult to install and remove the GPS 80. Install the rack in the aircraft panel using four #6-32 countersunk screws and four self-locking nuts. The screws are inserted from the inside through the holes in the sides of the rack (see Figure 3-5). [. . . ] Within this appendix, the base document will be referred to as the "Installation Manual". 2. 0 2. 1 INSTALLATION INSTRUCTIONS ANTENNA The GPS 80 antenna is to be installed on top of the cabin on the aircraft centerline at fuselage station 130. Figure A-2 illustrates the proper antenna positioning. Refer to section 2. 1 of the Installation Manual for general antenna mounting requirements. [. . . ]