Garmin GTX 327 Installation Manual

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GTX 327 Installation Manual Page 11190-00187-02 Rev J2.4 GTX 327 INSTALLATIONNOTESAvoid installing the unit near heat sources. If this is not possible, ensure that additionalcooling is provided. Allow adequate space for installation of cables and connectors. Theinstaller will supply and fabricate all of the cables. All wiring must be in accordance withFAA AC 43.13-1B and AC 43.13-2A.A. Assemble the connector/rack kit according to figure B2. Install the rack assemblyaccording to the dimensions given in figure B1 and paragraph 1.4.2, PhysicalCharacteristics of the GTX 327. Mounting brackets are not supplied due to the widerange of mounting configurations available. Suitable mounting brackets may befabricated from sheet metal or angle stock. To ensure a sturdy mount, provide rearsupport for the unit.B. The two recessed screw holes in the rear plate are not used. Do not insert screws throughthe rear plate of the mounting rack into the transponder, as the two holes are not intendedfor use with the GTX 327. Refer to figure B2.C. Looking at the bottom of the transponder, make sure the front lobe of the lockingmechanism is in a vertical position. This can be accomplished by using a 3/32” Allenwrench through the face plate.D. Slide the unit into the rack until the front lobe of the unit touches the rack. Guide pins onthe back plate will help in the proper alignment of the unit in the rack.E. Turn the Allen wrench clockwise until the unit is secured in the rack. Continue turninguntil tight. Do not overtighten the screw.F. To remove the unit from the rack, turn the 3/32” Allen wrench counterclockwise until itdisengages from the rack.2.5 COOLING AIRThe GTX 327 meets all applicable TSO requirements without forced-air cooling. The application offorced-air cooling to the rear heat sink of the GTX 327 provides beneficial cooling to the unit. TheGTX 327 is designed to dissipate its internal heat to the rear heat sink without the need of blowing airinside the unit.The GTX 327 was designed to handle a constant 450 PRF, with short periods of 1200 PRF. Rate limit isset at 1200 PRF. A typical radar site would interrogate the transponder once every 5 to 10 seconds forapproximately 100 msec at a 400 PRF rate. In very high traffic areas with multiple ground stations andTCAS traffic it is possible to have long term PRF rates above 450 PRF. The GTX 327 measures the unittemperature and without forced-air cooling the reply rate will be reduced to protect the transmitter fromoverheating.