terms of reference task 1 site preparation and ......6. work task 3: other site preparation...

ANNEX D

TERMS OF REFERENCE

TASK 1

Site Preparation and Construction Works

(excluding power and intra-site communication system)

for IMS Infrasound Station

IS42 Azores, Portugal

TOR: Site Preparation and Construction works for Infrasound Station IS42 Azores, Portugal

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Table of Content

1. BACKGROUND .................................................................................................................................................................. 3

2. SCOPE OF WORK ............................................................................................................................................................. 3

3. GENERAL DESCRIPTION OF THE IMS FACILITIES IS42 ....................................................................................... 4

3.1 GENERAL DESCRIPTION OF THE INFRASOUND ARRAY IS42 ................................................................................................ 4

3.2 GENERAL REQUIREMENTS: .................................................................................................................................................. 4

4. WORK TASK 1: DESIGN, SITE PREPARATION AND CONSTRUCTION .................................................................. 4

4.1 GENERAL OBLIGATIONS ...................................................................................................................................................... 4

4.2 CONSTRUCTION OF THE INFRASOUND ARRAY ...................................................................................................................... 5

4.3 WORK AT THE INFRASOUND ARRAY ELEMENTS ................................................................................................................... 6

4.3.1 General ............................................................................................................................................................................. 6

4.3.2 Array Element Locations ................................................................................................................................................ 6

4.3.3 Equipment Vaults ............................................................................................................................................................ 7

4.3.4 Grounding and Lightning Protection ............................................................................................................................ 7

4.3.5 Wind-Noise-Reducing Pipe Arrays ................................................................................................................................ 8

4.3.6 Security Fencing .............................................................................................................................................................. 8

4.3.7 Miscellaneous constructions ........................................................................................................................................... 8

5. WORK TASK 2: WORK AT THE CENTRAL RECORDING FACILITY (CRF) ............................................................ 8

5.1 GENERAL ............................................................................................................................................................................. 8

5.2 CENTRAL RECORDING FACILITY BUILDING ........................................................................................................................ 9

5.3 GROUNDING AND LIGHTNING PROTECTION SYSTEM .......................................................................................................... 9

6. WORK TASK 3: OTHER SITE PREPARATION WORK ............................................................................................... 10

6.1 ACCESS TO ARRAY ELEMENTS .......................................................................................................................................... 10

7. STATION INSPECTION ................................................................................................................................................. 10

8. REPORTING SCHEDULE .............................................................................................................................................. 10

8.1 GENERAL ........................................................................................................................................................................... 10

8.2 STATIONS DESIGN REPORT ................................................................................................................................................ 10

8.3 SITE PREPARATION & CIVIL WORKS PLAN AND TIME SCHEDULE ................................................................................... 10

8.4 PROGRESS REPORTS .......................................................................................................................................................... 11

8.5 FINAL/REVISED FINAL REPORT ......................................................................................................................................... 11

9. APPENDICES .................................................................................................................................................................. 12


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1. BACKGROUND

(a) The Provisional Technical Secretariat of the Preparatory Commission for the Comprehensive

Nuclear-Test-Ban Treaty Organization (the “Commission”) intends to establish the IMS

Infrasound Station IS42 at Graciosa, Azores, Portugal (the “Station”). This Station has been

designated as one of the facilities of the Infrasound Network of the Comprehensive Nuclear-

Test-Ban Treaty and identified for installation by the Commission as part of the 2008

program of work of the IMS (the “Project”).

(b) The Commission desires to engage a contractor (the “Contractor”) to provide goods, services

and works for the site preparation and construction required for establishment of the Station

in accordance with this Terms of Reference. The Contractor shall carry out the site

preparation and civil works.

(c) These Terms of Reference define the legal and technical framework of all related activities to

be performed during all Work Tasks and contain all technical requirements for the activities

which shall be carried out by the Contractor, as well as specifications of the equipment and

infrastructure which shall be installed at the sites of the Station.

2. SCOPE OF WORK

The Contractor shall carry out the works in connection with site preparation and construction works,

required for the Station in accordance with these Terms of Reference and in the most cost-effective

manner possible. The Project shall include the following tasks as referred to in Sections 4 to 6 below

(the “Work”) that need to be completed by the Contractor at the site before the installation of the

Commission’s Equipment:

(i) Fulfillment of all general obligations;

(ii) Repair and/or construction of access tracks to the array element sites and to the

Central Recording Facility (CRF);

(iii) Preparation of the terrain at the array element areas for the installation of the wind

noise reducing system (WNRS) in junction with the preparation for the installation of

the pre-fabricated vaults (see point vi)

(iv) Preparation of the terrain at the CRF area for construction of the CRF building;

(v) Installation of the security fence at all element sites and CRF;

(vi) Excavation of the terrain and installation of the equipment vaults at all array element

sites. The pre-fabricated vaults will be supplied by the Commission;

(vii) Construction of concrete bases for the pre-fabricated equipment vaults,

meteorological mast (H1 element only) and GPS antenna masts (at array elements);

(viii) Provision and deployment of gravel or soil on the WNRS at each array element;

(ix) Provision and deployment of sorted washed gravel on the inlet ports of the WNRS;

(x) Provision and installation of the lightning protection and grounding system.

(xi) Construction of the CRF building for housing electronic equipment;

(xii) Construction of the concrete base for Global Communication Infrastructure (GCI)

satellite antenna;


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(xiii) All other site preparation works, as described below, that need to be completed before

the installation of the Commission’s equipment.

For all work tasks, the Contractor must inform the Commission of the appropriate and current points of

contact, including contacts for: 1) technical matters, 2) logistics matters and 3) commercial matters. If

these points of contact change during any phase of the Work Tasks, the Contractor must inform the

Commission immediately in writing.

GENERAL DESCRIPTION OF THE IMS FACILITIES IS42

3.1 General description of the Infrasound Array IS42

a) The infrasound station IS42 shall be installed at Graciosa, Azores, Portugal. The infrasound

installation will be composed of an 8-element array shaped in the form of a pentagon with a centered

triangular sub-array. The array element sites shall be installed in areas of 20 x 20 m and fenced to be

protected from animals. The CRF shall be co-located with the H8 array element using a site with

dimensions of about 10 x 10 m or less.

Commercial AC electrical power shall be used to operate the station. This includes the infrasound

equipment and the GCI equipment at the CRF, as well as the array elements that shall be powered

from the CRF via aerial power lines. The Commission will supply remote power modules for each

array element.

An automatic backup power system shall be installed at the CRF to automatically supply power to the

CRF, the GCI equipment, and to the cabled array elements when commercial main power fails. This

backup power system is best implemented with an automatically switched diesel generator. The

system’s diesel fuel reservoir shall have sufficient capacity to provide power for at least five days

without refueling.

b) The intra-array communication system shall be based on single mode fiber optics. Each element in the

array shall transmit continuous data by single-mode optical fiber communications cable to the Central

Recording Facility building, collocated with the Global Communications Infrastructure (the “GCI”)

installation.

c) The power system and the intra-site communication system are not part of the present Terms of

Reference.

3.2 General requirements:

The essential elements of the Work are described in the Sections below, in three (3) Work Tasks to be

completed by the Contractor. The Contractor shall submit to the Commission a description and

timetable for each Work Task to assure that the work be carried out in the most appropriate and cost-

efficient manner. The Contractor may sub-contract any part of these Work Tasks.

4. WORK TASK 1: Design, Site Preparation and Construction

4.1 General Obligations

(a) The exact implementation of the proposed array configuration, as described in this Terms of

Reference, is essential for the successful completion of the Project.

(b) The Contractor shall assure that all works are performed in compliance with any national,


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municipal or local regulations, laws, building codes, licensing or permitting requirements that

relate to the site preparation, establishment and operation of the Station. The Contractor shall

obtain licenses, permits or authorizations needed to carry out the work under this contract.

(c) Any local environmental regulations regarding the use and disposal of construction materials

shall be investigated before the construction of the sites. Compliance with such requirements

and regulations shall be the responsibility of the Contractor.

(d) The Contractor shall submit to the Commission plans and reports as specified below, prior to

the start of the construction works.

(e) The Contractor shall submit a work schedule for the site preparation and the completion of all

civil works in English to the Commission. The Commission reserves the right to monitor field

operations at an agreed-upon time by sending the Commission’s staff or its representatives to

the Station.

(f) The Contractor shall ensure that the Commission’s staff or its representatives are granted

access to the site/Station at any time to monitor field operations and progress of the Work.

(g) In order to prepare the access to each site as well as the 20x20 meter area in which each array

element shall be located, the Contractor shall cut the vegetation, including trees, and shall

prepare the access roads/tracks to each site. The access road/track shall be large enough to

permit the transit of excavation and transport machines, as well as, later on, of a 4x4 vehicle

which will be used for the maintenance of the station. Upon completion of the construction

works, the Contractor shall replant small bushes of the same type of the local vegetation in the

20x20 meter area. The type of bushes to be used shall comply with the local environmental

regulations. All the access roads/tracks shall be made free from vegetation in order to permit

the access of vehicles. Whenever requested by the Commission, the Contractor shall be

responsible also for the construction of an access gate at the beginning of one or more access

roads/tracks. At the Central Recording Facility (CRF) the Contractor shall prepare a free line

of sight for the GCI antenna: for this reason, the height of the trees along the line of sight shall

be cut below a fixed limit which will be notified to the Contractor during the construction

works by the Commission.

(h) In order to minimize the damage to the natural environment during the site preparation and

construction of the Station, the Contractor shall use working and transportation machines as

small as possible and, whenever possible, shall do the work manually.

4.2 Construction of the infrasound array

(a) The Contractor shall be responsible for:

(i) Repair / construction of the access roads/tracks to the array element sites and to the

CRF;

(ii) Leveling cleaning and excavation works at the array element areas;

(iii) Installation of the Commission’s supplied equipment vaults;

(iv) Installation of grounding and lightning protection systems;

(v) Miscellaneous construction, including foundations for the equipment vaults,

provision and deployment of soil or gravel on the WNRS, provision and deployment

of meshed gravel on the inlet ports, erection of the security fencing and provision of

concrete bases for GPS antennas.

(vi) Construction of the CRF building.


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(vii) Construction of the concrete base of 1.2 m diameter for the VSAT satellite antenna

(see Attachment 1 for more details).

(viii) Replanting of small bushes of the same type of the local vegetation in the 20x20

meter area of each array element.

(ix) Fixing any damage caused along the roads/tracks in the course of installation.

(x) Provision of other items mentioned in Sections 4.3, 4.4 and 5 that may be missing

from this summarized list.

(b) The Contractor shall complete all preparation and civil works at the site. The essential

elements of the site preparation and construction tasks are described below.

4.3 Work at the infrasound array elements

4.3.1 General

(a) Each array element shall comprise:

(i) A buried weatherproof lockable equipment vault.

(ii) A wind-noise-reducing system (WNRS).

(iii) A meteorological mast at H1 array element only.

(iv) A GPS antenna mast.

(v) A grounding and lightning protection system.

(vi) A security fencing.

(d) An appropriate weatherproof and insulated vault will be provided by the Commission and

installed by the Contractor at each array element site. Design and installation process of these

vaults are described below.

(e) GPS masts will be provided by the Commission and shall be installed by the Contractor at

each array element site.

(f) A meteorological mast will be provided by the Commission and shall be installed by the

Contractor at H1 array element site.

(g) Efficient grounding and lightning protection system, as described below, shall be provided

and installed by the Contractor at each array element site.

4.3.2 Array Element Locations

Table 1 lists the coordinates of the array element sites and the Central Recording Facility. A schematic

diagram showing the configuration of the eight array elements at IS42 is shown in Figure 1.


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Table 1. Preliminary Coordinates for IS42 Azores, Portugal

Site Name Latitude Longitude Elevation (m)

CRF Co-located with H8 array element

H1 39.047330° N 027.998050° W 120

H2 39.045953° N 027.999047° W 140

H3 39.047270° N 028.000440° W 140

H4 39.050712° N 027.998807° W 120

H5 39.050420° N 027.986038° W 70

H6 39.043922° N 027.988215° W 100

H7 39.040155° N 027.996913° W 130

H8 39.042216° N 028.005324° W 210

4.3.3 Equipment Vaults

Appropriate weatherproof vaults will be provided by the Commission and shall be installed by the

Contractor at each array element. The vaults will house the electronic equipment, the batteries and the

remote AC power module. The Commission will provide remote AC power modules.

The Contractor shall build reinforced concrete base for each vault. The vaults shall be fixed to the

base by anchor bolts, supplied by the Commission together with the vaults. The vaults dimensions are

approximately 2 m by 1.7 m by 1.2 m. In order to prevent the risk of flooding, the vaults shall be

installed with at least 0.3 m of the vault entrance lying above the ground surface. A ground backfill,

stabilized by a plastic net, around each vault shall be necessary for temperature insulation and to

prevent turbulences in the vicinity of wind noise reducing system. The details of the vault installation

are shown in Figure 2.

Whenever an array element site will be prone to flooding, the Contractor shall take appropriate

measures to divert the water flow from the array element and from the pipe array. The design for the

protection from flooding shall be approved by the Commission prior to its implementation.

Additional explanations of the items to be supplied by the Contractor or by the Commission are given

in the captions of Figures 2 through 8.

4.3.4 Grounding and Lightning Protection

An efficient grounding and lightning protection system shall be provided and installed by the

Contractor at each array element. All equipment shall be connected to a common ground in the system

to minimize damage from lightning strikes and to eliminate ground loops. A common connection

point to the grounding system must be provided inside the vault.

The buried grounding system could be built according to the common PTS design, shown in the

Figure 3. The system is based on a series of long connected buried copper strips and grounding rods

arranged in a pattern, shown in figure 3. The grounding and lightning protection system at the array

element sites shall be included in the Station Design Report and shall be built in a way that is

consistent with local rules and regulations.

All masts must be electrically connected to the grounding system. As shown on figure 3 the pipes of

the WNRS, two fence corner posts and the metal cable conduit have to be connected to the grounding

system. This grounding system shall not only improve the grounding resistance but it shall spread out

much of the energy before it reaches the equipment. The Contractor shall provide and install all

materials, as necessary.

The grounding resistance MUST be less than 10 Ohms.


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4.3.5 Wind-Noise-Reducing Pipe Arrays

18-m diameter WNRS will be installed at each array element. An illustration of the WNRS is given in

Figure 5. The Commission will provide all material for the pipe array system, which will be made of

stainless steel; due to this structure, it will be possible to connect the lightning protection system

directly to the pipe array. The Commission will install and connect the pre-fabricated WNRS at all

array elements. The Contractor shall connect the lightning protection system to the pipe array, cover

the pipe array with soil or gravel and cover the inlet ports of the pipe array by a clean meshed gravel

of the fraction of 15-20 mm.

4.3.6 Security Fencing

All array element sites shall be fenced for security and protection from animals. The details of the

fencing are shown in Figures 6 and 7. The suggested arrangement for the security fence is an

approximately 20 square meters around each array element site. Locks with only one master key shall

be provided for all the gates at the security fence.

4.3.7 Miscellaneous constructions

The Contractor shall consider the need for miscellaneous construction works at the Station location

and fully specify all excavation/concrete/foundation/construction works to be done. The Contractor

shall investigate the needs of the miscellaneous construction works and obtain the Commission’s

approval before proceeding with the works.

5. WORK TASK 2: Work at the Central Recording Facility (CRF)

5.1 General

The Central Recording Facility (CRF) provides the interface between the array elements of the

Infrasound Station IS42 and the GCI for data transmission to the International Data Centre (IDC) in

Vienna.

The Contractor shall prepare a free line of sight for the GCI antenna: for this reason, the height of the

trees along the line of sight shall be cut below a fixed limit which will be notified to the Contractor

during the construction works by the Commission.

The main elements of the Central Recording Facility are:

(a) A room to house the equipment for operation of the IS42 Infrasound Station;

(b) A central recording system, containing hardware and software to receive and integrate data

from all array elements of IS42. The central processor will also convert the data to an

appropriate format for transmission to the IDC in Vienna. These functions will be carried out

using a PC workstation;

(c) A VSAT Antenna;

(d) A grounding and lightning protection system;

(e) A backup power supply system to maintain the operation of the stations in the event of a

power failure.


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5.2 Central Recording Facility Building

The Contractor shall construct a Central Recording Facility building, consisting of two rooms,

approximately 12 m2 and 8 m

2, for the data recording and GCI equipment and power backup system

respectively. The rooms shall be supplied with adequate lighting, electrical power distribution system

and electrical outlets.

An air conditioning system shall be provided and installed by the Contractor at the CRF equipment

room. The system shall provide operational temperatures for the CRF electronic equipment (below

25°C).

The facility at CRF shall be included in the Station Design Report and shall be designed and built in

accordance with all relevant local codes, regulations, and applicable safety procedures.

In case the CRF site will be prone to flooding, the Contractor shall take appropriate measures to divert

the water flow from the CRF. The design for the protection from flooding shall be approved by the

Commission prior to its implementation.

5.3 Grounding and Lightning Protection System

To minimize damage to equipment caused by lightning strikes, the Contractor shall design an

electrical and lightning protection system for the CRF.

Usually, a number of copper rods driven in to the ground and interconnected with the copper strip or a

buried grid of thick copper strips are sufficient. The grid shall cover an area equivalent to 2-4 square

meters and the burial depth shall be approximately 1 meter.

The Contractor shall provide a suitable single grounding point (earth point) inside the CRF building.

All equipment shall be connected to the grounding point to minimize damage from lightning strikes

and to eliminate ground loops.

The grounding resistance MUST be less than 10 Ohms.

The electrical grounding and lightning protection system at the CRF shall be included in the Station

Design Report and shall be designed and installed in accordance with all relevant local codes,

regulations, and applicable safety procedures.

6. WORK TASK 3: Other site preparation work

6.1 Access to Array Elements

In order to prepare the access to each site as well as the 20x20 meter area in which each array element

shall be located, the Contractor shall cut the vegetation, including trees, and shall prepare the access

roads/tracks to each site. The access road/track shall be large enough to permit the transit of excavation

and transport machines, as well as, later on, of a 4x4 vehicle which will be used for the maintenance of

the station. Upon completion of the construction works, the Contractor shall replant small bushes of

the same type of the local vegetation in the 20x20 meter area. The type of bushes to be used shall

comply with the local environmental regulations. All the access roads/tracks shall be made free from

vegetation in order to permit the access of vehicles. Whenever requested by the Commission, the

Contractor shall be responsible also for the construction of an access gate at the beginning of one or

more access roads/tracks. In order to minimize the damage to the natural environment during the site

preparation and construction of the Station, the Contractor shall use working and transportation

machines as small as possible and, whenever possible, shall do the work manually. The Contractor

shall be responsible for fixing any damage caused along the roads/tracks in the course of installation

and for replanting, whenever necessary, bushes or trees compliant with the local environmental

regulations.


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7. STATION INSPECTION

The Commission’s representatives can carry out inspections any time during the performance of the

works. Specifically, the Commission will visit the sites after completion of all works to make sure that

the sites are ready for the installation of the infrasound equipment. It is expected that two

Commission’s representative will take part in the inspections. The Commission may invite technical

representatives for inspection. The Contractor shall facilitate the work of the Commission’s

representatives by providing on-site transportation and other logistical arrangements as required.

8. REPORTING SCHEDULE

8.1 General

The Contractor shall provide 2 (two) copies of the Reports listed below in English to the Commission.

8.2 Stations Design Report

The Contractor shall submit a Stations Design Report including a detailed design plan for the CPF

and all infrasound elements of the proposed construction including the power supplies, grounding and

lightning protection system for the array elements and the CPF and taking into account the layout of

the wind-noise-reducing pipe arrays. These plans must be approved by the Commission before

construction of any part of the station.

Any change of the plan/coordinates must be approved by the Commission prior to the construction of

the array elements.

8.3 Site Preparation & Civil Works Plan and Time Schedule

The Contractor shall submit a detailed time schedule for all Work Tasks. The Work shall be

completed within three months after entry into force of the Contract. The completion of the Work

shall be marked by the acceptance of the Commission of the Final/Revised Final Report.

8.4 Progress Reports

The Contractor shall prepare and submit to the Commission two (2) Progress Reports of site

preparation and construction work. First Progress Report shall summarize 30% and second 70% of the

Work done to comply with Sections 4, 5 and 6 of these Terms of Reference.

Each Progress report shall be submitted in English within four (4) weeks after completion of each part.

8.5 Final/Revised Final Report

Within 4 (four) weeks after completion of all Works referred to the ToR, the Contractor shall prepare

and submit to the Commission a Final Report in English. If the Commission, after the review of the

Final Report, requires further information and/or more detailed description of remedial actions taken

(as required by the Commission during or after the installation of the Commission’s Equipment, if

any), the Commission shall instruct the Contractor to revise the Final Report to include such

additional information and/or a more detailed description of remedial actions. Such revision shall be

submitted to the Commission within 4 (four) weeks of the instruction for review and acceptance.


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10. APPENDICES

10.1 Figures

Figure 1. Map showing the location of the IS42 infrasound array elements and Central Recording

Facility (CRF).


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Figure 2. View of a half-buried equipment vault at an infrasound array element.


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Figure 3. Illustration of proposed grounding and lightning protection system for the array

elements.

The buried grounding and lightning protection system has to be built according to the PTS design in a way that

is consistent with the system already put in place at other infrasound stations. The system is based on a series

of long connected buried copper strips and grounding rods arranged in a pattern similar to the one shown

above.


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Power Board Equipment Board

Digitizer

(Europa T)

Copper grounding bar

Cable gland

Grounding

cable

Digitizer

(Europa T)

<Met>

Figure 4. Illustration of interconnection of the grounding system at the equipment vault and at the

array element.


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Figure 5. 92-ports 18-m diameter wind-noise-reducing pipe array will be provided and installed

by the Commission, at each array element site.


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Figure 6. Schematic of the equipment vault and fencing for the array element sites. The layout

can be changed according to the specificities of each site.


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Figure 7. Proposed type of fence.


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Figure 8a. Central Recording Facility Building sketch.

Figure 8b. Central Recording Facility area layout.


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Comprehensive Nuclear-Test-Ban-Treaty Organization

Global Communications Infrastructure (GCI)

GCI

1.2 m Antenna specification

The content of this Booklet gives a detailed specification on the equipment

to be installed at each PTS/CTBTO stations around the globe.

Last changes

Revision Date Changes

1 Specifications issued by CTBTO/PTS

2 September

2004

Updated with site prep details for 1.2 m Pedestal mount

Authorisation

Title Name Signature Date

PTS/CTBTO

Communications

Officer

P.Thapanapaha


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Purpose

This document gives background information on antenna mounting so that the surveyor will

understand what kind of information needs to be collected. The recommended mount for 1.2 m

antenna is a standard elbow mount. If this mount is to be used then there will not be a civil works

requirement.

The Non-Pen Mount can also be installed on the building providing it has a flat roof. If the building

is not suitable for the antenna to be mounted on it then civil work will be required based on

achieving the following objectives for the installation:

An assessment of the soil/rock structure will be required.

The antenna can be mounted without the use of a hoist.

The terrain is leveled and a proper concrete mounting surface exists where required.

Water drainage is adequate and does not collect at or near the equipment.

A wall opening for the IFL cable is available or possible.

There are grounding facilities at the point of installation of the dish.

Cable trunking is available in the building and cable ducting is available for cross-site access.

Possible use of Radomes.

Note that all civil works must be completed prior to the VSAT installation.

Psi-Sys will supply all antenna mounting materials unless agreed otherwise.

THE LOCATION OF THE ANTENNA AND MOUNT SHOULD BE CONFIRMED IN THE SITE SURVEY REPORT

FORM.


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General Requirements

1.3 Antenna

A diagram of the 1.2 m antenna is shown in this document. The antenna will be delivered to site

in one piece. The dimension and weight of the antenna assembly is given in the table below.

Unless specified in the site survey the antenna will be provided without de-icing.

Antenna

size

Dimensions (m) Weight

w/o de-

icing

Weight with

de-icing 1.2 m 1.5H x 1.5D x

1.2W

30 kgs

(66 lbs)

44 kgs

(97 lbs)

1.4 Antenna Mount Type

Building Mount

The 1.2 m antenna can either be mounted on the wall or roof of the equipment housing providing

that the structure is deemed to be suitable to the Site Surveyors knowledge. It is recommended

that where roof or wall mounted is suggested on the site survey that a structural survey be

completed.

Wall Mount

The 1.2 metre antenna can alternatively be mounted by using a wall bracket. The wall bracket

(AYWM15 or AYWM30) is preferred. (Another name for the wall bracket is “elbow mount.”)

Diagrams showing dimensions and weight of each of these mounts are shown in this document.

The walls should either be brick or concrete, again the construction should be examined to

ensure that there are no external cracks that may have weakened the strength of the walls.

Non Penetrating Mount (NPM)

If it is intended to use the NPM then a minimum flat surface area of 2.0 m x 2.0 m is required. If

the mount is to be used on a roof then the maximum loading of the construction of the roof will

need to be verified. The roof construction should either be concrete or tarmac covering. Roof

structures of steel beams covered in corrugated steel and board covered in roof felt are not

suitable for the NPM.

A diagram showing the dimensions and weight of the Non Penetrating Mount is given in this

document.

The roof integrity should be checked to ensure that there are no signs of leakage or dampness

seeping through into the building.

Ground Mounting

The NPM can also be used to mount the antenna on the ground. It is also possible to use a pole


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mount or a pedestal mount (diagrams at the end of the document).

1.5 IFL Cable Routing

In order to protect the IFL cable between the antenna and the indoor unit, the cable may be

routed either through underground cable ducting, overhead, supported by a catenary wire, or

surface mounted. If the cable can only be surface mounted, a suitable cable protector must be

used or personnel/vehicle access must be restricted.

If civil works for the base mount is required, underground cable ducting is recommended to be

laid at the same time. The minimum inside diameter of the ducting should be 30 mm. The

minimum bend radius is 4 – 6 inches (10 – 15 cm.) depending on type of cable.

If the antenna active de-icing is required, mains power will be required at the antenna assembly.

A separate power duct is preferred but if only one cable duct is available screen power cabling

should be used.

Cable specifications are given on page 6 of the GCI VSAT Equipment Specification.

1.6 Grounding & Lightning Protection

The VSAT antenna is not provided with lightning protection, but the antenna assembly will be

grounded. A suitable grounding point (earth point) should be provided at the site. The IMS or NDC

site shall provide a good antenna earth within 10m of the proposed antenna site. The earth

grounding resistance measured from the antenna mount to the ground point and should be less than

two (2) ohms. Usually a good building earth (for example an earthed structural steel member,

metallic cold water pipe or copper spike driven in to the ground) is sufficient.

In determining whether a good grounding has been obtained the current should be measured from the

IFL shield to the grounding point. If a voltage of more than 1 (one) is found then another ground

point must be found.


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Site Preparation

If the antenna is to be mounted on the ground, either using a NPM mount or a pole, there will be

a civil works requirement. Both options for mounting will require concrete base to be laid. The

minimum dimensions of the concrete base should be 2.0 m x 2.0 m x 0.5 m. The NPM will be

secured using ballast (i.e. concrete blocks or paving slabs). If a pole mount is used then it will be

secured to the concrete base using a mast plate and screws. If the site is susceptible to heavy

snowfall then a pole mount may be the most suitable mount to be used.

The table below shows the minimum dimensions needed for the base of the NPM and the worst

case total load and loading per square area on the structure supporting the antenna (for example,

the roof or ground). The total load considers the wind loading of a 200 kph (125 mph) wind into

the antenna.

psf = pounds per square feet

kg/m2 = kilos per square metre

Antenna

size

Dimensions

of mount

base

Antenna

weight

(including

electronics

)

Mount

Weight

Ballast

required

Total

Load of

antenna

and

ballast

Loading

per square

area

1.2 m 5.58 x 5.58 ft

1.7 x 1.7 m

108 lbs

49 kgs

66 lbs

30 kgs

1,470 lbs

668 kgs

1,644 lbs

747 kgs

52.80 psf

258 kg/m²


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25

AYWM15 OR AYWM30 1.2 M WALL BRACKET (ELBOW MOUNT)


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26

AYWB2 1.2 m Wall Pole Mount

305mm

hole diameter

= 14mm

plate thickness

= 5mm

angled steel

= 75mm

Holes are drilled

on 3.5” centers

for 2.88” mast

1120mm 990mm


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27

Wall Pole Mounts AYBK05 & AYBK05A

AYBK05 AYBK05A

458 mm (18") 610 mm (24")

4

6

5

1

2

3

610 mm (24")

45

8 m

m (

18

")

4

2.5

ME

TR

E M

AS

T

2.5

ME

TR

E M

AS

T

Item No Description AYBK05 AYBK05A

1 75 x 50 x 6 RSA Brackets 2 2

2 75mm (3”) o/d mask x 2.5 M 1 1

3 M12 “U” Bolts 2 2

4 4 mm Thick Back Plate - 2

5 M12 Parabolts 10 -

6 M12 x 500mm Studding - 10 sets

Direct or Through The Wall Mounting.

The AYBK05/5A is supplied in pairs and can be either fixed directly to a surface or where this is

not possible, clamped through via a back plate and studs. The unit is all steel galvanised

construction.

AYBK05 - Nett weight = 40 KGs. Box size = 690mm x 480mm x 470mm

AYBK05A - Nett weight = 54 KGs. Box size = 690mm x 480mm x 470mm


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28

Flat Surface Non - Penetrating Mounts

"A" "A

"

760 m

m

2

3

74

8

1

75 mm (3.0") O/D

AYFSM1 A = 1870 mm

AYFSME/400 A = 1670 mm

AYESME/500 A = 2070 mm

Item No Description Qty

1 Frames ( 4 0 x 40 x 3 RSA) 4

2 Centre Post 75mm (3”) o/d Tube 1

3 Supports ( 40 x 40 x 3 RSA) 4

4-7 Fastener Kit 1 Set

8 Cushioning Pad 1 Set.

The Flat Surface Mount

The flat surface mount is manufactured in three sizes to accommodate the standard slabs used

throughout Europe and the UK. Each mount can hold up to sixteen slabs for ballast. All

versions are despatched in one number top opening box, complete with parts list. Unit is all steel

galvanised construction.

ATFSM1 (450MM SQUARE SLAB BALLAST) - UK

AYFSME/400 (400MM SQUARE SLAB BALLAST) - EUROPE

AYESME/500 (500MM SQUARE SLAB BALLAST) - EUROPE

AYFSM1 - Nett weight = 50 KGs. Box size = 980mm x 980mm x 200mm

AYFSME/400 - Nett weight = 43 KGs. Box size = 880mm x 880mm x 200mm


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29

AYESME/500 - Nett weight = 57 KGs. Box size = 1080mm x 1080mm x 200mm


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30

PEDESTAL MOUNT:

(Note this mount is the same as the wall mount – all parts are delivered in one package).

To install this mount a concrete pad with dimensions of 1m x 1 m x 0.4 m is required to be

provided. The backing plate and four bolts provided with the antenna must be laid in the

concrete as shown in the diagram below. Once the concrete is poured and dried the mount can

be secured onto the bolts buried in the concrete.

Pedestal mount foundation requirements

The minimum foundation requirements are as follows:


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31

1. The soil bearing capacity should be 2000 pounds per square foot at a minimum and the

bottom of the foundation should be 6 inches below the local frost line.

2. Concrete should be poured against undisturbed soil.

3. All concrete should have a minimum compressive strength of 3000 pounds per square inch at

28 days.

4. Allow concrete 24 hour set time before installation of antenna.

5. The minimum size and construction should be 1m x 1m x 0.4m.

6. There should be 10 - #5 x 42 inches long reinforcing bars positioned underneath.

terms of reference task 1 site preparation and ......6. work task 3: other site preparation...

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