User manual GARMIN GPS 80 Release Note

[. . . ] Figure 11 defines the function of each pin on the 37 pin DSUB connector located at the back of the rack. Figure 1-2 depicts the interconnects between the rack and other instruments. CDI: (Pins 1 and 5) Capable of driving up to three 1000 ohm parallel loads, +150 millivolts full scale deflection with a maximum output of +300 millivolts. Capable of driving up to three 200 ohm parallel loads, +82 millivolts full scale deflection. [. . . ] If the box is found to be radiating, the following can be done: 1) Place the antenna as far from the VHF COMM unit and antenna as possible. Av. Q Page 7 2) 3) 4) 2. 2 Replace or clean VHF COMM rack connector to assure good coax ground. 1 ACCESSIBILITY Plan a location which gives the pilot complete and comfortable access to the entire keypad and which is plainly visible from the pilot's perspective. Check that there is adequate depth for the rack in the instrument panel. A location away from heating vents or other sources of heat generation is optimal. 2. 3 CABLING AND WIRING The recommended antenna cable type is M17/155-0001 (RG-58A/U) per MIL-C-17. 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. 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). 3. 5 GPS 80 INSTALLATION AND REMOVAL The GPS 80 is installed in the rack by sliding it straight in until about 1 inch short of the final position. A 3/32 inch hex drive tool is then inserted into the access hole at the bottom of the unit face. Rotate the hex tool clockwise while pressing on the left side of the Bezel until the unit is firmly seated in the rack. It may be necessary to insert the hex drive tool into the access hole and rotate the mechanism 90 counterclockwise to insure correct position prior to placing the unit in the rack. Using the controls on the GPS 80 front panel, make the selections indicated below and verify the interfaces as appropriate: OBI Data VALID INVALID OBI Value Ensure that the OBI indicates the proper value Ensure the OBI is invalid Ensure that the OBI displays the value entered when the VALID option is selected Select the Annunciator Test Page by removing the cursor from the OBI Test Page and turning the outer knob one detent to the right. Using the controls on the GPS 80 front panel, make the selections indicated below and verify the interfaces as appropriate: Panel OFF ON Msg OFF ON Av. Q Page 12 Ensure no panel annunciators are illuminated Ensure all panel annunciators are illuminated Ensure the Message Annunciator is OFF Ensure the Message Annunciator is ON Arrival OFF ON Ensure the Arrival Annunciator is OFF Ensure the Arrival Annunciator is ON Select the Power Test Page by removing the cursor from the Annunciator Test Page and turning the outer knob one detent to the right. [. . . ] 2. 3 WIRING Fabricate an appropriate cable to connect the GPS 80 aviation rack to 28VDC power, a message annunciator, a remote switch (for selecting between GPS and standard navigation equipment), a transfer switch with integral white, illuminated annunciators with black markings (to control and indicate the status of the remote switch). Route and connect the wiring in accordance with Advisory Circular AC-43. 13-2A. After the wiring installation is complete, carefully check the operation of all flight controls throughout their range to assure that no operational interference exists. Av. Q Page 22 2. 4 PLACARDS After completion of the GPS 80 system installation, affix a durable placard on the instrument panel in the location shown in Figure A-3 which states "GPS limited to VFR use only". [. . . ]