User's Manual

ManualsBrandsSelex Sistemi Integrati ManualsElectronicsAVIATION SERVICES DME TRANSMITTER

1.INSTALLATION, INTEGRATION AND CHECKOUT

1.1 Introduction

This section contains installation information for the independently located DME. If the DME is to be

collocated with VOR or ILS refer to the basic instructions in this section and to the installation instructions

for the VOR or ILS equipment. With respect to general requirements, a good VOR or ILS site will satisfy

the DME requirements as well. System performance must be verified by flight inspection. Figure 1-1

shows a typical DME site.

NOTE

After flight inspections and prior to use by pilots, it is mandatory that

the monitor be left in control of the facility and not in bypass.

1.2 Site Information

1.2.1 Site Selection

The signal radiated from the DME is affected by obstructions and terrain in the immediate vicinity of the

antenna and by obstructions and terrain within the service range of the station. An ideal site would be the

highest ground in the vicinity with level terrain, cleared of all objects for a radius of at least 3000 feet (915

meters), and with no obstructions extending above the horizontal plane of the antenna within the service

range of the station. In most localities, it is not possible to satisfy the ideal site requirements. Every effort

must be made to obtain the best site available. Although no absolute minimum requirements can be stated,

a site is normally acceptable if it meets the recommendations contained in the following paragraphs.

1.2.1.1 Terrain Features

The terrain should be level within a radius of 200 feet (61 meters). In a radius between 200 and 1000 feet

(61 and 305 meters), a downward slope is acceptable if (1) the rate of descent is not more than 4 feet in 100

feet (1.22 meters in 30.5 meters) and (2) contour lines are generally circular around the site. Beyond a

radius of 1000 feet (305 meters), terrain should be below the horizontal plane of the antenna.

1.2.1.2 Obstructions

There should be no structures within 750 feet (229 meters) of the antenna. Metallic structures should not

subtend vertical angles greater than 1.2 degrees as measured from the antenna. Wooden structures with

negligible metal content should not subtend vertical angles greater than 2.5 degrees as measured from the

antenna. Structures having considerable length (such as aircraft hangers or administration buildings)

should be situated lengthwise on a radial from the antenna. Single trees less than 35 feet (11 meters) high

may be tolerated beyond 750 feet. No group of trees or groves may be within 1000 feet. No overhead

power or control lines are permissible within 750 feet of the antenna.

Summary of content (22 pages)

PAGE 1
.INSTALLATION, INTEGRATION AND CHECKOUT 1.1 Introduction This section contains installation information for the independently located DME. If the DME is to be collocated with VOR or ILS refer to the basic instructions in this section and to the installation instructions for the VOR or ILS equipment. With respect to general requirements, a good VOR or ILS site will satisfy the DME requirements as well. System performance must be verified by flight inspection. Figure 1-1 shows a typical DME site.
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Figure 1-1 Typical DME Site
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1.2.2 Shelter Requirements The shelter location depends primarily on the maximum cable run allowed and on the desired location for the DME antenna. An RF transmission line of 2" foamflex cable (with Type N connectors at each end), one cable for the monitor antenna made up of 1/4" foamflex (with a Type N connector at one end and a TNC male connector at the opposite end), and one AC cable for the OB Lite may be supplied with the DME equipment. These cables are 35 feet long.
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1.5.2 Installation Kits Refer to Table 1-2 for all component or modification kits required to install the DME station. Some kits listed are optional equipment. Kits ending with “X” have many different varieties and will vary depending on the site specific requirements. In all necessary cases installation drawings for each kit are provided with the kit hardware.
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Figure 1-2 Typical DME Tower Installation Diagram
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Figure 1-3 Triangular Tower Adapter Plate
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Figure 1-4 Typical DME Shelter and Tower Grounding Diagram 1.5.8 DME Cabinet Installation a. b. c. d. e. Unpack the DME 19” rack system and stand upright inside the equipment shelter. The rack can be located on an outside wall or in the center of the room; however the ventilation louvers located on the left side of the cabinet must not be obstructed. To level the rack use the adjustable feet then lock the feet positions using the jam nuts.
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d. e. f. Install battery backup wiring between the DME transmitter cabinet and the battery backup assembly. The battery ground lead should connect to the grounding bus bar and the battery hot wire (+48V) should connect to TX1 DC breaker located on the 1A26 Status Panel Assembly. When supplied with two battery kits then connect the hot wire (+48V) from the second battery set to the TX2 DC breaker; otherwise install the jumper wire between TX2 DC breaker and TX1 DC breaker as provided in the battery kit.
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d. e. f. g. h. Thread the obstruction light assembly into the antenna. Use thread tape on all pipe threads to insure a water tight fit. Connect the three AC wires from the antenna to the bulb sockets, as shown in Figure 1-5 or Figure 1-6. Install the lighting rod to the obstruction light nipple as detailed in Figure Error! Reference source not found.. Verify the obstruction light bulbs match the site AC voltage rating then install the bulbs and lens.
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1.5.13 DME Antenna Installation a. b. c. Use a crane and nylon slings to lift the DME antenna to the top of tower. Install DME antenna on triangular tower adapter plate as shown in Figure Error! Reference source not found.. Orientation of the obstruction bulbs and lightning rod is not important. Secure antenna with appropriate hardware provided in the DME antenna kit.
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Figure 1-8 Obstruction Light Installation Diagram
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1.5.14 DME Transmitter to Antenna Interconnect a. b. c. d. e. f. g. Refer to Figure 1-7. Route ½” Heliax RF feedcable through conduit and connect to antenna connector J1 (RF INPUT). Route ¼” Heliax antenna monitor cable through conduit and connect to antenna connector J2 (RF MONITOR OUTPUT). Note that in most installations the J3 RF MONITOR OUTPUT port can be used instead of J2 however J2 is preferred. Route obstruction light power cable through conduit and to antenna connector J4 (OBSTN LT INPUT).
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ALLOWED” a remote user logged into Security Level 3 can put the DME station in Local Mode from the PMDT and change all parameters as if connected directly to the cabinet in the shelter. When set to “~NOT ALLOWED” the system can not be put in Local Mode from the PMDT and remote parameter changes are blocked throughout the software. 1.6 Inspection Prior to energizing the equipment, a visual inspection is made to eliminate circumstances that could cause power-up failures. a. b. c.
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1.7.4 PMDT Hookup and Setup a. Unpack the PMDT laptop computer and follow the manufacturer’s installation instructions to powerup the computer, create a user account, and logon to Windows™ as an administrator. b. Insert the 978178-XXXX PMDT CD-ROM into the laptop computer. c. Select Start >> Run then type D:\Setup.exe to start the PMDT installation. Note if installation does not start then use the correct drive letter associated with the CD-ROM drive. d. Follow the default prompts for PMDT installation. e.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 1X - - - 1025 12 962 12 900 1Y - - - 1025 36 1088 30 900 2X - - - 1026 12 963 12 901 2Y - - - 1026 36 1089 30 901 3X - - - 1027 12 964 12 902 3Y - - - 1027 36 1090 30 902 4X - - - 1028 12 965 12 903 4Y - - - 1028 36 10
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 18X 108.1 334.7 - 1042 12 979 12 917 18Y 108.15 334.55 - 1042 36 1105 30 917 19X - - 108.2 1043 12 980 12 918 19Y - - 108.25 1043 36 1106 30 918 20X 108.3 334.1 - 1044 12 981 12 919 20Y 108.35 333.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 36X 109.9 333.8 - 1060 12 997 12 935 36Y 109.95 333.65 - 1060 36 1123 30 935 37X - - 110.0 1061 12 998 12 936 37Y - - 110.05 1061 36 1124 30 936 38X 110.1 334.4 - 1062 12 999 12 937 38Y 110.15 334.25 - 39X - - 110.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 54X 111.7 333.5 - 1078 12 1015 12 953 54Y 111.75 333.35 - 1078 36 1141 30 953 55X - - 111.8 1079 12 1016 12 954 55Y - - 111.85 1079 36 1142 30 954 56X 111.9 331.1 - 1080 12 1017 12 955 56Y 111.95 330.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 72X - - 112.5 1096 12 1159 12 971 72Y - - 112.55 1096 36 1033 30 971 73X - - 112.6 1097 12 1160 12 972 73Y - - 112.65 1097 36 1034 30 972 74X - - 112.7 1098 12 1161 12 973 74Y - - 112.75 1098 36 1035 30 973 75X - - 112.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 90X - - 114.3 1114 12 1177 12 989 90Y - - 114.35 1114 36 1051 30 989 91X - - 114.4 1115 12 1178 12 990 91Y - - 114.45 1115 36 1052 30 990 92X - - 114.5 1116 12 1179 12 991 92Y - - 114.55 1116 36 1053 30 991 93X - - 114.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 108X - - 116.1 1132 12 1195 12 1007 108Y - - 116.15 1132 36 1069 30 1007 109X - - 116.2 1133 12 1196 12 1008 109Y - - 116.25 1133 36 1070 30 1008 110X - - 116.3 1134 12 1197 12 1009 110Y - - 116.
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Table 1-5 DME Channel Frequency Allocation ILS/VOR Frequency Monitor Interrogator Transmitter Reply Receiver LO DME Channel LOC (MHz) GS (MHz) VOR (MHz) Freq (MHz) Pulse Code µs Freq (MHz) Pulse Code µs Freq (MHz) 126X - - 117.9 1150 12 1213 12 1025 126Y - - 117.95 1150 36 1087 30 1025 1.7.6 System Checkout a. b. c. d. e. f. g. h. Bypass the Integral monitor and select Tx1 Main. For dual equipment bypass the Standby monitor and select Tx2 Load.