EMF Survey Training - Part 1

EMF SURVEY

Course Name: EMF Survey

Morning Session (11am to 1:30pm)

Lun

ch b

reak

Afternoon Session (2:30pm to 6pm)

Day 1

Introduction to EMF Survey

DoT Threshold

EIRP Calculation

Compliance by Self Certification

Compliance by Broadband

Compliance by Narrowband

Mitigation Technique

Report Format

EMF Tool Overview

This module will enable participants to understand the process of EMF survey and report format that will be submitted to DoT

SOLPAR & DT engineers Pre-Requisite

Basic understanding of 2G & 3G cellular network

Course Objective

Who should attend

Course Name: EMF Survey

Course Objective

This module will enable participants to understand the process of EMF survey and report format that will be submitted to DoT

Who should attend

SOLPAR & DT engineers

Pre-Requisite

Basic understanding of 2G & 3G cellular network

Morning Session (11am to 1:30pm)

Lun

ch b

reak

Afternoon Session (2:30pm to 6pm)

Day 1

Introduction to EMF Survey

DoT Threshold

EIRP Calculation

Compliance by Self Certification

Compliance by Broadband

Compliance by Narrowband


Report Format

EMF Tool Overview

Good to know

Keep your mobile phone in the silent mode during the session

Need to sign attendance sheet at the start and end of each day

At the end of each training pre and post test will be conducted

Need to interact with trainer for any queries related to subject during training

Stick to break timings

Your valuable feedback will be taken at the end to enhance training experience

Agenda Introduction

EMF exposure zones

Exposure Level assessment

DoT Recommended Threshold

Tools for EMF Measurement

EMF Process

EMF work flow in Circle

EMF evaluation techniques

Determination of EIRPth

Field Measurement Approach

Self Certification by Service Operator

Compliance by Calculation of EIRP/EIRPth

Format of Report for Normal Compliance

Compliance by Broadband Measurement

Compliance by Narrowband (Frequency Selective) Measurement


Introduction

Magnetic field variation is perpendicular to electric field

A single frequency electromagnetic Wave exhibits a sinusoidal variation of electric and magnetic field space .

Electromagnetic waves transport energy through empty space , stored in the propagating electric and magnetic

Aim: To confirm LTE base station compliance as per the limits specified by DoT. Electric fields are created by differences in voltage.

Magnetic fields are created when electric current flows. The Electromagnetic field (EMF) can be viewed as the combination of an electric field and a magnetic field. Base Transceiver Stations (BTS) of Mobile Network produce EM fields. Frequency of the signal radiated from these sources determine important characteristic of the EM field.

EMF is measured in the form of Power Density whose unit is W/m2 and is dependent on the frequency band at which it is being radiated FSL=92.45+20 log f(GHz)*d(Km)

EMF exposure zones

EMF exposure assessment is made if

the intentional emitters are present, and

conducted for all locations where people might be exposed to EMF in course of their normal activities.

All such exposures to EMF pertain to one of these three zones

Compliance zone

Occupational zone

Exceedance zone

Exceedance zone

Occupational Zone Compliance Zone

Exposure level assessment

the worst emission conditions;

the simultaneous presence of several EMF sources, even at different frequencies.

The assessment of the exposure level shall consider:

the maximum EIRP of the antenna system

the antenna gain G or the relative numeric gain F including maximum gain and beam width

the frequency of operation

various characteristics of the installation, antenna location,

antenna height,

beam direction,

beam tilt and

the assessment of the probability that a person could be exposed to the EMF.

The following parameters should be considered:

Regulatory Bodies for EMF SACFA(standing Advisory Committee on Frequency Allocation )

Site clearance from view of interference ,aviation hazards and obstruction to any other microwave links .

Municipal and Gram panchayat authority clearance

ICNIRP (International Commission on Non-Ionization Protection)

Determine exposure limits for electromagnetic fields by devices such as cellular phones .

TERM Cells(Telecom Enforcement, Resource and Monitoring Cells)

Test 10% of BTS sites randomly as per the procedure prescribed by TEC (TELECOM ENGINEERING CENTER)

Control over illegal operation of telecom networks by vested interests having no license

To file FIR against culprits, pursue the cases, issue notices indicating violation of conditions of various Acts in force from time to time.

Analysis of call/subscription/traffic data of various licensees.

To ascertain that the licensee is providing the services within permitted area.

Constitution of Inter Ministerial Committee(IMC)

Consist of DoT officers , Indian Council of Medical Research ,Department of Bio Technology , Minister of Environment and Forest

Lab Studies where unable to find direct link between exposure to radio frequency radiation and health

IMC recommended for the lowering mobile towers EMF exposure limits to the 1/10th of the exiting prescribed limit

IMC Recommended Thresholds

Frequency Range Norms EMF Field Formula Band Threshold Value 50% of DoT Limit

400-2000MHz New

Electric Field Strength (V/m)

0.434f1/2

800 12.28 6.138

900 13.02 6.51

1800 18.41 9.207

2000 19.41 9.705

Power Density (W/m2)

f/2000

800 0.4 0.2

900 0.45 0.225

1800 0.9 0.45

2000 0.95 0.475

Magnetic Field Strength (A/m)

0.0011f1/2

800 0.0311 0.016

900 0.033 0.017

1800 0.0467 0.023

2000 0.0479 0.024

Frequency Range Norms EMF Field Threshold Value 50% of DoT Limit

2-300GHz New

Electric Field Strength (V/m)

19.29 9.645

Power Density (W/ m2)

1 0.5

Magnetic Field Strength (A/m)

0.05 0.02

Band wise Threshold 400-2000MHz:

Band wise Threshold 2-300GHz:

Tools Requirement for EMF Measurement

EMF Tool with built-in GPS with calibration certificate(Recommendation Narda )

TEC Certified 3D Isotropic antenna.

Laser Distance Meter.

Digital Camera.

Magnetic Compass for azimuth measurement.

Measuring Tape.

Laptop to process the measured results.

EMF Process eNB Power-ON &

Commissioning

EMF Site Survey

Preparation for EMF

Calculation by Self Certification Method

Measurement by Broadband Method

Measurement by Narrowband Method

Compliance Check

Compliance Check

Compliance Check

SAMSUNG RJIL OSS Snapshot Collection

Collection of data; Panoramic ,

signage board & adjacent snaps etc.

Prerequisite check for EMF-site database, RF parameters ,OSS

Snapshots and Other operator database

EMF compliance check by Self certification method

Other Operators (within 20 Mtrs from own site)

Database Collection

Report Submission to RJIL

Mitigation Technique Implementation (for

other Operator )

Mitigation Technique Review & Approval

Mitigation Technique Suggestion

Mitigation Technique Implementation (for Own

Site )

Report Preparation

Pass-ok[Report].Fail-Broadband test

Measurement by Broadband method by TEC certified tool on corner Location . Adjacent building location which likely to be high exposure Zone within 60mtrs.Power density-Pass if 1 and forward for retest by Narrow Test

Measurement by Narrowband test , test to be done for all sector present on site including sharing operator EMF to be checked & problematic Sector to identify

Mitigation technique implementation : Change antenna orientation Change antenna pole location TX power reduction Sector Shutdown

Y

N

Y

N

N

Y

EMF Work Flow in Circle Start

EMF Site Survey

Preparation for EMF

Calculation by Self Certification Method

Measurement by Broadband Method

Measurement by Narrowband Method

Process for SOLPAR Samsung Circle RF Team RJIL Circle RF Team

Compliance Check

Compliance Check

Report Preparation

Report Submission

Report Preparation

Compliance Check

Database Review Other Operator Database

Check & Propose Mitigation Techniques

Review Report of Fail Cases

Report Check & Database Preparation

Final Report Check &

submission to DoT

DoT Report Review

Self Certification : Dependency a)RJIL site Database (P1) b) Sharing site database (RP1) c) If P1 or RP1 sites database required of site within 20mtrs, d)If Non-Compliance ,then Broadband test to be performed

Broadband test: Other operator Site database like carrier, spectrum Details Required. Test to be performed for near by buildings which may be highly exposure or falling in main direction of antenna. In case Non-Compliance Narrow Band test to be performed

Narrowband test: Test for each Individual operator sector wise, Need to check for self carrier & Then test to be performed for all Other existing sectors on site .In Case of Non-Compliance Mitigation Techniques to suggest

Report Preparation: Report to be prepared for Compliant & Non-Compliant both Compliant Report Review & Submission to DoT Non-Compliance Report-Mitigation technique check Follow up with operator Final database review & check, submission to Dot

EMF Process

Pass

Fail

Pass

Fail

Pass

Fail

Work Scope SOLPAR: Perform the EMF site survey. Perform the EMF test measurement (Self Calculation/Broadband/Narrowband) and prepare

the reports. Perform the EMF broadband testing again and prepare the report.

SAMSUNG: Review the site database of other operators for self certification calculations. Review EMF report and propose the mitigation techniques for non compliance cases. Discussion & finalize the mitigation technique for non compliance cases. Implement the finalized mitigation technique for own site. Review EMF report of retest done by SOLPAR and submit to RJIL RF Lead.

RJIL: Provide the other operators database required for self certification calculation to Samsung. Review the EMF report along with mitigation techniques proposed by Samsung and provides

his consent for necessary implementation. Coordination/follow-up with other operators for necessary changes in case of non compliance

due to other operator. Coordinate / follow up with other operator to implement mitigation techniques for other

operators in case of non compliance due to other operator. Review the final EMF report and submit to TERM Cell / DoT. Yearly submission of EMF database & report.

EMF Report submission Timeline

Day 1 - SCFT Test & EMF Survey

Day 2- SCFT analysis, Self Certification Calculation & EMF report preparation

Day 3- EMF Report review & Submission to RJIL (with Hardcopy)

Best Case Scenario

Day 1 SCFT Test & EMF Survey

Day 2 SCFT analysis

Day 3 Physical change on field to meet SCFT KPIs, if SCFT fails, Performs SCFT re-test.

Day 4 - SCFT report analysis (KPI & Overshooting check), EMF self certification calculation (If fail, go for broadband method)

Day 5 - EMF report preparation & submission to RJIL (In case self certification pass) or EMF broadband testing or narrowband testing.

Day 6 - EMF report preparation & submission to RJIL (in case broadband testing pass) or narrowband testing analysis, Mitigation technique workout & suggestion for RJIL case.

Day 7 - Mitigation technique implementation, go for EMF broadband testing.

Day 8 - EMF broadband testing & EMF report preparation.

Day 9 - EMF report submission

Note: Mitigation techniques implementation for own & other operator may take more than 2 days depending on technique applied and EMF report submission timeline may increase accordingly.

Worst case Scenario

OSS SNAPSHOT

Revised Self Certification Submission Criteria

Increase in TRX/Channel

Change of Antenna

Change in Electrical/Mechanical Tilt

In case the antenna height is 8m or more from roof top/ground as the case may change in tilt more than 3 degree from earlier intimated level

In case the antenna height is 8m is less from roof top/ground as the case may any change in tilt from earlier intimated level

Change in azimuth (more than 2 degree)

Change in Antenna Height

EMF Prerequisite

Site Database Collection from RJIL including

other Operator database

Technical Parameters

collection from RJIL including

other Operator

SITE DATA & TECHNICAL PARAMETER

Name of BTS: SECTOR 21 System Type LTE

Site Data

ITEM Units RJIL LTE Remarks

SITE ID Sector1 Sector2 Sector3

Name

Date of commissioning

Address

Lat-Long

RTT/GBT/RTP/GBM

Building Height (AGL) Mtrs

Antenna Height (AGL) Mtrs

System Type (GSM/CDMAUMTS)

Make & Model of Antenna

Base channel frequencies for all sectors

Mhz

Carrier/Sector

Trans-power dBm

Technical Parameters collection from RJIL including other Operator

Base Channel Frequency [BCCH Freq for GSM / C-PICH (Common Pilot Channel Freq.) for CDMA and UMTS] for all sectors.

No. of carriers / sector ,

Electrical Tilt & Mechanical Tilt /sector

Antenna Gain in dBi

Horizontal & Vertical Beam-width of Antenna.

Antenna make & model

Antenna Side Lobe Attenuation.

Transmitter Output power in dBm

Combiner Loss if any in dB

RF Cable Length from Antenna to the BTS or from RRH (in Mtrs).

RF Cable Loss (dB/100m)

Technical Parameters that are required for own site & other operator sites available within 20M from own site for EMF self certification calculations:

Placement of Safety Signages Board The mobile service operator will ensure provision of proper signage warning entry of general public of the exclusion zones.

The sign board should be clearly visible and identifiable and may contain the following text in black over white background, (Annexure EMF Signages Board Guideline)

DANGER: On the tower structure at a height of 2 to 4 meters.

WARNING: To be provided only where exclusion zone is formed in any area accessible to public.

CAUTION: At the entry point of roof of the building of BTS in case of RTT or at the entrance of BTS compound in case of GBT.

The rules for placement of signage are as follow:

Size of Signage: All signage shall be of 2 feet in width and 3 feet in height.

EMF Site Survey

Building Height, Antenna Height & tower Height

Electrical tilts & Mechanical tilt, total tilts

Antenna Azimuth

Site Co-ordinates (Lat-Long)

Height & distance of C1,C2,C3,C4 points from tower

Site Data Collection

Surroundings buildings with 60m radius from the site are to be surveyed which are likely to experience EMF exposure and to be marked as B1,B2,B3,.Bn etc.

Following data to be provided for each of these buildings

Horizontal distance from the tower base (m) in case of GBM and from building base in case of RTT/RTP/Delta tower.

Azimuth from the tower (Deg)

Building height (in Mtrs from AGL) along with no. of floors building address

Co-ordinates (Lat-Long) of buildings.

Adjacent Building Data Collection

Site Overview & layout

Type & Location of the tower/poles/GBT/GBM/Delta

Shelter location

DG Location

Marking for corner/points C1,C2,C3 and C4

Location of safety signages installed, entrance point etc.

Location of publicly accessible areas like roof top, lift shafts, water tanks etc.

Adjacent building/tower locations

Antenna directions

A site/Roof layout is to be prepared having marking for north direction, following data to be collected in the site.

Site Overview & layout

G+8 LMR

6M

6M

6M

ODU

C2

C3

C1

C4

CA

UTI

ON

WA

RN

ING

DANGER

35M

35M

25M

25M

Site Name:

Site ID

Road

00N

Corner/Accessible Location

Distance Height

C1

C2

C3

c4

Format for collecting Adjacent/General Public access data

Site Name:

Site ID:

Latitude:

Longitude:

0

90

180

270 46 m

Adjacent building Latitude Longitude Height (m) No. of floors Azimuth from the tower

Distance from tower (m)

B1

B2

Bn

Any neighbour Towers within 20m radius

Site Snapshots

Site Snapshot 1. Panoramic snaps of

surroundings ( In 30degree increment)

2. Existing Tower, Existing Building & Co-ordinates snapshots of GPS

3. Signage board snaps 4. Sector Snaps 5. Adjacent Building

Snap, adjacent tower snaps if any

6. Distance snapshots of laser meter

Existing Tower, Building & Co-ordinates snapshots of GPS

EIRP/EIRPth DoT limit EIRP: Effective isotropic radiated power

Is the amount of power that a theoretical isotropic antenna would emit to produce the peak power density observed in the direction of maximum antenna gain .

EIRP can take into account the losses in transmission and connector and antenna gain

Formula

EIRP=Pt L +G

Where Pt is Tx Power

L is connector and cable loss

G is antenna Gain

EIRPth: EIRP Threshold corresponds to the exposure limit for the power density or field from the reference antenna for the accessibility condition.

Ratio of EIRP/EIRPth -should be

Self Calculation Method

Calculation of EIRP[T] Total

for worst sector(Per

Operator/Technology).

Calculation of EIRPth for

worst sector as per prescribed DoT formulae depending on accessibility

category (Per Operator/Tech

nology).

Determination of EIRP/EIRPth ratio for worst

sector(Per Operator/Tech

nology)

Summation of ratios of

EIRP/EIRPth for present

Operators/Technology for accessibility

category.

Overall Compliance

check for site depending on

EIRP/EIRPth ratio

calculated for various

Operators (within

20Mtrs) & for various

accessibility categories.

Identification of Worst Sector

Worst sector identified from the Operator/Technology & EIRP/EIRPth ratio calculated for that particular sector to check the compliance of EMF.

Operator Technology Worst Sector Description Operator 1 LTE Sector having lowest antenna height or Highest Tilt

Operator 2 2G Sector having maximum number of carriers/Lowest

frequency carrier Operator 3 3G Sector having lowest antenna height or Highest Tilt

Operator 4 CDMA Sector having maximum number of carriers/Lowest

frequency carrier

Identification of Worst Sector

Lat LongTower

Height

Building

Height AGL

Antenna

Height AGLBase Channel Frequency

Antenna

Gain

Vertical -

bw

Side Lobe

AttenuationTx Power

Combiner

Loss

RF Cable

LengthUnit Loss Azimuth

(Deg) (Deg) (m) (m) (m) (MHz) (dBi) (Deg) (dB) (dBm) (dB) (m) (dB/100m) (Deg)

1 Operator 1 1 19.0966 73.0007 RTT 24 15 26 GSMCarrier1-900,Carrier2-900.2,

Carrier3-900.4,Carrier4-900.64 Ace XXDW-17-65i-VT 17 6 7 17 46 0 12 0 0 No -

2 Operator 1 2 19.0966 73.0007 RTT 24 15 22 GSMCarrier1-900,Carrier2-900.2,

Carrier3-900.4,Carrier4-900.64 Ace XXDW-17-65i-VT 17 4 7 17 46 0 14 0 120 No -

3 Operator 1 3 19.0966 73.0007 RTT 24 15 24 GSM

Carrier1-900,Carrier2-900.2,

Carrier3-900.4,Carrier4-900.6,

Carrier5-900.8,Carrier6-901

6 Ace XXDW-17-65i-VT 16 8 6.5 17 46 0 10 0 240 Yes

Highest number of

Carriers/

Lowest Frequency

4 Operator 2 1 19.0966 73.0007 RTT 24 15 30 LTE 2300 1 Ace XXDW-17-65i-VT 17 7 7 17 46 0 10 0 0 Yes

Lowest Antenna

Height/

Highest Tilt

5 Operator 2 2 19.0966 73.0007 RTT 24 15 31 LTE 2300 1 Ace XXDW-17-65i-VT 17 5 7 17 46 0 10 0 120 No -

6 Operator 2 3 19.0966 73.0007 RTT 24 15 32 LTE 2300 1 Ace XXDW-17-65i-VT 17 3 7 17 46 0 10 0 240 No -

Make & Model of

Antenna

Total Tilt -

Worst

Carrier

(Yes/No)

RemarksSl NoOPERATOR

NAMESec ID

GBT/RTT/

RTP

System

Type

(GSM/CDM

A/UMTS)

Carriers /

Sector

Operator 1 GSM ,f=900 Operator 2- LTE ,f=2300

EIRP-Effective Isotropic Radiated Power Calculation

Total EIRP (EIRP [T]) calculation for each Operator for worst sector

To calculate the total EIRP (EIRP [T]) for an operator, the EIRP of the BCCH Channel (Pilot Channel in case of CDMA) is worked out as follows:

The EIRP [T] is then given by:

Whereas for LTE, 3G & CDMA m-Diversity factor=1, n-ATPC factor=1,N=Carriers / Sector(Worst sector)

Whereas for GSM m-Diversity factor=0.9, n-ATPC factor=0.9

If it is a shared site, similar calculation are made for the other operators and total ratio

For successful compliance of EMF (EIRP/EIRPth) should be

Types of Standard Accessibility category Accessibility

Category Relevant Installation Circumstances Pictures

1 Antenna is installed on an inaccessible tower the centre of radiation is at a height h above ground level. There is a constraint h > 3 m. Antenna is installed on a publicly accessible structure (such as a rooftop) the centre of radiation is at a height h above the structure.

2 Antenna is installed at ground level the centre of radiation is at a height h above ground level. There is an adjacent building or structure accessible to the general public and of approximately height h located a distance d from the antenna along the direction of propagation. There is a constraint h > 3 m.

3 Antenna is installed at ground level the centre of radiation is at a height h (h > 3 m) above ground level. There is an adjacent building or structure accessible to the general public and of approximately height h' located at a distance d from the antenna along the direction of propagation.

4 Antenna is installed on a structure at a height h (h > 3 m). There is an exclusion area associated with the antenna. Two geometries for the exclusion area are defined: A circular area with radius a surrounding the antenna; or A rectangular area of size a b in front of the antenna.

ACCESSIBILITY 1

ACCESSIBILITY 2

ACCESSIBILITY 3

ACCESSIBILITY 4

Calculation of EIRPth : DoT Formulae for different accessibility categories

Diagram

Tower Type

Applicable to

Accessibility Category

If f> 2Ghz-300GHz

Condition 1 Condition 2 Result Parameter of Description

RTT Only

B0:C1,C2,C3,C4

1

Lesser of (Condition

1,Condition 2)

h=Antenna Height AGL-Building Height Asl=Attenuation of side lobe w.r.t Main beam =Total Tilt bw=Vertical Beam width

RTP,GBM,GBT

&WALL MOUNT

B1,B2,B3Bn

2 (determine by:

h< h-d tan(+1.129bw)


1,Condition 2)

h=Antenna Height AGL-Building Height h=Adjacent Building Height Asl=Attenuation of side lobe w.r.t Main beam d= Adjacent Building distance from Antenna

RTP,GBM,GBT &WALL MOUNT

B1,B2,B3Bn

3 (determine by:


L Lesser of (Condition

1,Condition 2)


RTP,RTP,GBM,GBT &WALL

MOUNT

Ground Level

1


1,Condition 2)


22hAsl

2

129.1sin

2

bw

hh

22hAsl

22hAsl

22hAsl

2d

222 )'(

d

hhd

Asl

2

129.1sin

2

bw

hh

Diagram

Tower Type

Applicable to

Accessibility Category

If f=400-2000MHZ

Condition 1 Condition 2 Result Parameter of Description

RTT Only

C1,C2,C3,C4

1


1,Condition 2)


RTP,GBM,GBT

&WALL MOUNT

B1,B2,B3Bn

2 (determine by:



1,Condition 2)



B1,B2,B3Bn

3 (determine by:


L Lesser of (Condition

1,Condition 2)



Ground Level

1


1,Condition 2)


2

129.1sin

2

2000

bw

hf

222000

hAsl

f

222000

hAsl

f

222000

hAsl

f

222000

hAsl

f

222 )'(

2000

d

hhd

Asl

f

2

129.1sin

2

2000

bw

hf

2

2000d

f

EIRP/EIRPth Calculation for B0-Corners

B0

Case 1: RTT (Antenna installed on a roof top tower On the terrace of a building),C1,C2,C3,C4 corners-Operator1 & 2

h=9m

Building Height=15m

Tower height=24m C1

C2

C3

C4

B0

OP1,h= 9m,worst sector antenna height


h=15m

Operator 1 GSM ,f=900 Operator 2- LTE ,f=2300

Antenna

Gain

Vertical -

bw

Side Lobe

Attenuation

Tower

Height

Building

Height

Antenna

Height

(AGL)

Tx

Power

Combiner

Loss

RF Cable

LengthUnit Loss

Frequency

(f)

(dBi) (Deg) (dB) mtr mtr mtr (dBm) (dB) (m) (dB/100m) MHz

Opeartor1 16 8 6.5 17 24 15 24 46 0 10 0 900

Opeartor2 17 7 7 17 24 15 30 46 0 10 0 2300

OperatorTotal Tilt -

Case 1:RTT(Corner Identification C1,C2,C3,C4)

C1

C2

C3

C4

d =10m

d =25m d =15m

d =20m

B0



Operator1-EIRP CALCULATION

Total EIRP (EIRP [T]) for Operator 1: To calculate the total EIRP (EIRP [T]) for an operator1, the EIRP of the BCCH Channel is worked out as follows: EIRP (BCCH) = Tx Power Combiner Loss (Cable Length x Unit Loss) + Antenna Gain (dBm) The EIRP [T] is then given by: EIRP [T] =EIRP (BCCH) watts +EIRP (BCCH) watts x m x n x (N 1) Where m-Diversity factor=0.9, n-ATPC factor=0.9,N=Carriers / Sector So, EIRP(BCCH) for Operator 1 =46-0-0+16 =62 dBm = 1584.89 watts Hence EIRP[T]= 1584.89 + 1584.89 *0.9*0.9*(6-1)=8003.71 watts

Total number of carriers=N=6

Antenna GainVertical -

bw

Side Lobe

Attenuation

Side Lobe

Attenuation

Building

Height

Antenna

Height

AGL

Tx PowerCombiner

Loss

RF Cable

LengthUnit Loss

Frequency

(f)

(dBi) (Deg) (dB) Numerical factor mtr mtr (dBm) (dB) (m) (dB/100m) MHz

Opeartor1/B0 16 8 6.5 17 0.02 15 24 46 0 10 0 900

Total Tilt -

Operator

Operator1: EIRPth calculation

Formula

Example:

h= 9Mtr (Antenna height AGL Building height),Asl=0.02, =8, bw=6.5 Applying formula as above & taking minimum of condition1 & condition2 ,EIRPth comes as =990.01 Hence EIRP[T]/EIRPth= 8003.71/990.01=8.08

As it is a shared site, similar calculation are made for the other operator2 and total ratio calculated as under: (EIRP/EIRPth) = (EIRP [T]/EIRPth) Op1 + (EIRP [T]/EIRPth) Op2


bw

Side Lobe

Attenuation

Side Lobe

Attenuation

Building

Height

Antenna

Height

AGL

Tx PowerCombiner

Loss

RF Cable

LengthUnit Loss

Frequency

(f)


Opeartor1/B0 16 8 6.5 17 0.02 15 24 46 0 10 0 900

Total Tilt -

Operator

DoT Formula

Tower Type

Applicable to Accessibility Category

If f> 400-2000MHz

Condition 1 Condition 2 Result

DoT Formula

RTT Only

C1,C2,C3,C4

1


1,Condition 2)

Calculation

3471.83

990.01

990.01

222000

hAsl

f

2

129.1sin

2

2000

bw

hf

Operator2-EIRP CALCULATION

Total EIRP (EIRP [T]) for Operator 2: To calculate the total EIRP (EIRP [T]) for an operator1, the EIRP of the BCCH Channel is worked out as follows: EIRP (BCCH) = Tx Power Combiner Loss (Cable Length x Unit Loss) + Antenna Gain (dBm) The EIRP [T] is then given by: EIRP [T] =EIRP (BCCH) watts +EIRP (BCCH) watts x m x n x (N 1) Where m-Diversity factor=1, n-ATPC factor=1,N=Carriers / Sector So, EIRP(BCCH) for Operator 1 =46-0-0+17 =63 dBm = 1995.26 watts Hence EIRP[T]=1995.26 + 1995.26*1*1*(1-1)=1995.26 watts


bw

Side Lobe

Attenuation

Side Lobe

Attenuation

Building

Height

Antenna

Height

AGL

Tx PowerCombiner

Loss

RF Cable

LengthUnit Loss

Frequency

(f)


Opeartor2/B0 17 7 7 17 0.02 15 30 46 0 10 0 2300

Total Tilt -

Operator

Operator2: EIRPth calculation

Formula

Example:

h= 15Mtr (Antenna height AGL Building height), Asl=0.02, =7, bw=7 Applying formula as above & taking minimum of condition1 & condition2 ,EIRPth comes as =8026.95 Hence EIRP[T]/EIRPth= 1995.26/8026.95=0.25


bw

Side Lobe

Attenuation

Side Lobe

Attenuation

Building

Height

Antenna

Height

AGL

Tx PowerCombiner

Loss

RF Cable

LengthUnit Loss

Frequency

(f)


Opeartor2/B0 17 7 7 17 0.02 15 30 46 0 10 0 2300

Total Tilt -

Operator

h

DoT Formula

Tower Type

Applicable to Accessibility Category

If f> 2000MHz

Condition 1 Condition 2 Result

DoT Formula RTT B0,C1,C2,C3,C4 1 Lesser of (Condition 1,Condition 2)

Calculation

26609.49

8026.95

8026.95

22hAsl

2

129.1sin

2

bw

hh

EMF Survey Training - Part 1

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Transcript of EMF Survey Training - Part 1