Automated Weather Observing System AWOS I Site Preparation Manual × 3000-1-025 FAA APPROVED ECP180 — 2011 May 5 NOT FAA APPROVED Rev. A All Weather Inc. • 1165 National Drive • Sacramento, CA 95834 • USA • 800.824.5873 • www.allweatherinc.
Copyright © 201 , All Weather, Inc. All Rights Reserved. The information contained herein is proprietary and is provided solely for the purpose of allowing customers to operate and/or service All Weather, Inc. manufactured equipment and is not to be released, reproduced, or used for any other purpose without written permission of All Weather, Inc. Throughout this manual, trademarked names might be used.
C O N T E N T S AWOS 3000 SITE PREPARATION MANUAL Table of Contents 1. GENERAL .......................................................................................................................................................................................... 1 1.1 Introduction ........................................................................................................................................................................... 1 1.2 Definitions ...................................
G E N E R A L 1 Chapter General 1.1 Introduction This manual is designed to assist a contractor retained to prepare a site for an Automated Weather Observing System (AWOS). Site preparation includes not only the actual physical work, but permits, licenses, and coordination with airport authorities. This document provides details for concrete, towers, conduit and underground lightning protection.
AWOS 3000 SITE PREPARATION MANUAL G E N E R A L 1.3 Steps Before Site Preparation Begins A site survey is highly recommended before a site is selected. In particular, the site needs to accommodate the needs of the following sensors. • Model 2020 Vane and Model 2030 Anemometer — Large obstructions within 300 m of the sensor dictate the minimum height for the sensor. Refer to the Model 2020 Micro Response Vane User’s Manual and to the Model 20 0 Micro Response Anemometer User’s Manual for more information.
AWOS 3000 SITE PREPARATION MANUAL G E N E R A L 1.5 Coordination with Airport Authorities The Airport will furnish the contractor with information relative to the facility. As available, this information will include equipment layout drawings, aerial photographs, coverage charts, obstruction plots, contour maps, existing termination points for commercial power and communications systems, and plot plans delineating proposed construction. Specific manufacturer’s data is included in this document.
S I T E P R E P A R A T I O N 2 Chapter Site Preparation Once a Notice to Proceed is received and all permits and licenses required by local authorities for the work have been procured, the contractor shall perform the following site preparation work. 1. Perform clearing, grading, excavation, filling and backfilling. 2. Provide all concrete work (tower base, sensor foundation pads, etc.) 3. Install the 30' tower with obstruction lights and lightning rod. 4.
E L E V A T I O N A N D W I N D D I R E C T I O N B E N C H M A R K S 3 Chapter Elevation and Wind Direction Benchmarks A surveyor should be retained to locate the North benchmark. A wind direction reference point must be established in one of the four cardinal directions to align the wind direction sensor. It is simplest to use True North as the reference, though at some installations this may not be feasible. The reference point should be established relative to the center of the AWOS tower.
H A R D W A R E I N S T A L L A T I O N 4 Chapter Hardware Installation The hardware installation includes the construction of all foundations, placement of conduit, erection of the tower, connection of the AC power distribution system, tower lights, and lightning rod, and, for radio data link installations, installation of the antenna mast and antenna. 4.1 Foundations Foundations described in this section apply to installations in the Continental U.S. where the frost depth does not exceed 36 inches.
H A R D W A R E AWOS 3000 SITE PREPARATION MANUAL I N S T A L L A T I O N 4.2 Conduit, Trenching, and Lightning Protection All sensor locations will require signal, power, and lightning protection cables. The conduit, trenching, and lightning protection details are specified in the drawings. After the foundations are poured, excavate a trench from the incoming power source (and land line communications cable, if applicable) to the 30' tower and from there to each of the foundation pads.
H A R D W A R E AWOS 3000 SITE PREPARATION MANUAL I N S T A L L A T I O N 4.3 Utility Services 4.3.1 Input Power The contractor shall provide and install the required AC input power (see the Power Requirements drawing) for use by the AWOS, connecting to an existing power source as determined during the site survey. Transformers, main disconnect boxes etc., if required, shall be provided in accordance with ANSI-C57, 12.25-1981. 4.3.
H A R D W A R E AWOS 3000 SITE PREPARATION MANUAL I N S T A L L A T I O N 4.4.3 UHF/VHF Data Link Antenna Mast (Data Link Installations Only) (See the Radio Data Link Antenna Mast drawing). Bend a piece of ¾" conduit (rigid or EMT) as shown on the drawing. Locate the antenna mast on the side of the tower nearest the Central Station Equipment. No obstructions may exist between the antenna on the tower and the antenna located near the Central Station Equipment. A clear line-of-sight path is required.
H A R D W A R E AWOS 3000 SITE PREPARATION MANUAL I N S T A L L A T I O N 4.5.6 UHF/VHF Data Link Radio Antenna Mast (Data Link Installations Only) The UHF/VHF Data Link Radio Antenna (supplied by All Weather Inc.) must be located outdoors and away from obstructions. This antenna is usually mounted on the roof of a building; however other mounting configurations are available (see the Central Station Antenna Mast Options drawing). The antenna mast should be at least 5' in length.
S I T E C L E A N U P A N D R E S T O R A T I O N 5 Chapter Site Cleanup and Restoration Site cleanup and restoration shall include the following: 1. Removal of all contractor-furnished material, tools and equipment that will not become airport property upon acceptance of site work. 2. Removal of all trash, litter, packing, and excess material from the site, to be disposed of by the contractor. 3.
T E S T S A N D I N S P E C T I O N S 6 Chapter Tests and Inspections The contractor is responsible for securing all necessary construction and electrical permits, waivers, etc., before commencing work. After completion of the work, the contractor shall demonstrate acceptable work to the airport owner, manager, or other authority as appropriate.
C O O R D I N A T I O N 7 Chapter Coordination The contractor shall perform all work in a manner that does not conflict with or adversely affect the air traffic operational environment. In the event of any actual or potential conflict, air traffic activities shall have priority over all contractor activities. The contractor shall provide services in a manner and at such times as will not disrupt the normal flow of air traffic.
M A T E R I A L S L I S T 8 Chapter Materials List All Weather Inc. shall supply the tower and the tower light fixture. The site preparation contractor shall provide the remaining materials as listed in the Material List in drawing 3000-1-007.
A N T E N N A M O U N T I N G M A T E R I A L S L I S T 9 Chapter Antenna Mounting Materials List The following table lists the material requirements for antennas installed as part of the Central Station equipment. All sites require one antenna at the Central Station for VHF radio voice output. Sites using UHF data links require two antennas at the Central Station, along with mounting hardware and masts. Select one mounting option from the table for each antenna.
D R A W I N G S 10 Chapter Drawings The following pages contain drawings detailing site preparation activities.
This antenna is supplied to operate satisfactorily within the frequency range(s) specified on the carton label. Some models require cutting of radiator and/or radials in accordance with Figure 11. If the antenna is to be used over a range of frequencies, the element lengths should be chosen for mid-range or favor the element length for the most used, or the frequency requiring the greatest range. ASSEMBLING THE ANTENNA 1) Select antenna location and route cable from set to antenna.
Lengths on chart are approximate. For finer tuning, use a VSWR bridge if antenna is to be used for transmitting. Remove vinyl cap before measuring and cutting. Slide vinyl cap back on after cutting. UHF/VHF Antenna Assembly (cont.
Base and Roof Mount. Heavy-gauge steel swivel base fits the slope of most roofs. 1¼" mast locks into U-bolt. Radio Shack P/N 15-889 Vent Pipe Mount. Brackets attach to 2" to 5" vent pipes (GC model fits 2" to 4" vents). 1¼" mast clamps into place. Radio Shack P/N 15-893 GC Electronics P/N 8802 12" Wall Mounts. Secures 1¼" mast 12" from side of building. Radio Shack P/N 15-885 GC Electronics P/N 8312 4" Wall Mounts. Secures 1¼" mast 4" from side of building.
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